Shahid Saleem - Academia.edu (original) (raw)

Papers by Shahid Saleem

Materials Chemistry and Physics, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Materials Letters, May 1, 2021

Abstract This paper presents the fabrication of UHMWPE/nano-Al2O3/Vitamin-C hybrid composites sui... more Abstract This paper presents the fabrication of UHMWPE/nano-Al2O3/Vitamin-C hybrid composites suitable for use as artificial cartilages in total joint prosthesis. Three composite variations were fabricated using the hot press technique, keeping the Vitamin C weight percentage constant at 2% and varying Al2O3 weight percentage by 0.5%, 1% and 2% respectively. Al2O3 was used as an anti-wear additive in UHMWPE and Vitamin C was used as an anti-oxidant. The fabricated composite pins were subjected to wear tests against Ti6Al4V alloy under dry sliding and human serum lubrication. It was observed that the 2 wt% Al2O3 filled UHMWPE showed better wear performance than the other composites and that human serum adheres to the surface of the composite pins upon sliding. This leads to the formation of a film which results in better wear resistance of the composite pins under human serum lubrication than dry sliding.

Journal of Thermoplastic Composite Materials, Jul 28, 2020

The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight po... more The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight polyethylene (UHMWPE) with 316L stainless steel and Ti6Al4V under dry and lubricated sliding conditions using human body fluids (synovial fluid and human serum). Eighteen trials of experiments were performed using a reciprocating sliding tribometer (pin-on-disc) at 37 C based on Taguchi's L 18 (2 1 Â 3 2) array. The in-vitro experimental results revealed that UHMWPE offers better tribological performance under synovial fluid lubrication conditions irrespective of the counterface material. The optimization of the response variables (coefficient-of-friction (COF) and specific wear rate (WR)) was performed using optimization techniques (Taguchi and Grey relational analysis). It was revealed that Ti6Al4V counterface material under synovial fluid lubrication and normal load of 52 N exhibits the optimal tribological performance with UHWMPE. The contribution of process parameters on the COF and WR was evaluated using analysis of variance. It was established that load is the most significant parameter, affecting COF and WR.

Engineering Research Express

This study aims at exploring the improvement in extreme pressure (EP) properties with addition of... more This study aims at exploring the improvement in extreme pressure (EP) properties with addition of natural Garlic oil as EP additive. Comparative investigations were conducted on PAO4 base oil, Natural Garlic oil (NGO) and PAO4 + 1 wt% NGO (Natural Garlic Oil) for evaluating the extreme pressure properties. The EP tests were conducted on a four ball tester according to ASTM D 2783. The results revealed that NGO possesses significantly good extreme pressure properties having a weld load of 3087N and load wear index of 513N. The results also revealed that NGO could significantly improve the weld load and load wear index of PAO4 base oil. After adding 1 wt% garlic oil to PAO4 the load wear index increased by 62.51% and weld load increased by 25%. This study proposes garlic oil as a replacement to the use of nano-particles as EP additives and aims to eliminate the disadvantages that are prominent with nano-particles without comprising the performance.

Polymers and Polymer Composites, 2021

Ultra high molecular weight polyethylene (UHMWPE) is widely used for articulating surfaces in tot... more Ultra high molecular weight polyethylene (UHMWPE) is widely used for articulating surfaces in total hip and knee replacements. In the present work, the tribological properties of UHMWPE-based nano composites were studied in order to meet the demands of current bearing applications. UHMWPE matrix reinforced with 0.5, 1, and 2 weight percentage of alumina nano powder were fabricated by hot pressing. The dispersion and microstructure of composite material was established by X-ray diffraction (XRD) and scanning electron microscope (SEM) micrograph. The tests were carried out on a reciprocating sliding pin-on-disc tribometer at human body temperature (37±1°C) under dry and human serum lubricating environments for a normal load of 46 N and 52 N, a constant sliding speed of 4 mm. Under these testing conditions, it has been observed that the wear behavior of the developed composites improved with increase in weight percentage of alumina nano powder. The results show that at 52 N load, the m...

Industrial Lubrication and Tribology, 2021

Purpose This study aims to fabricate and investigate the tribological performance of ultra-high m... more Purpose This study aims to fabricate and investigate the tribological performance of ultra-high molecular weight polyethylene (UHMWPE)-based composite materials reinforced with 0.5, 1 and 2 weight percentage of graphene nanoplatelets (GNPs) while keeping the weight percentage of vitamin C constant at 2% for each composite. Design/methodology/approach In this paper, the composites were fabricated using hot pressing, and the dispersion of GNP/vitamin C/UHMWPE hybrid composite was investigated by X-ray diffraction. Experimental trials were performed according to ASTM F732 on a reciprocating sliding tribometer (pin-on-disc) at human body temperature of 37 ± 1 °C, for a load of 52 N, to assess the role of these fillers on the tribological properties of UHMWPE against Ti6Al4V counter body material under dry and lubricating (human serum) environment. Findings In this study, it has been observed that friction and wear behavior of the developed composites improve with increase in weight perc...

Journal of Thermal Analysis and Calorimetry

Materials Today: Proceedings

International Journal of Materials Engineering Innovation

Journal of Thermoplastic Composite Materials

The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight po... more The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight polyethylene (UHMWPE) with 316L stainless steel and Ti6Al4V under dry and lubricated sliding conditions using human body fluids (synovial fluid and human serum). Eighteen trials of experiments were performed using a reciprocating sliding tribometer (pin-on-disc) at 37°C based on Taguchi’s L18 (21 × 32) array. The in-vitro experimental results revealed that UHMWPE offers better tribological performance under synovial fluid lubrication conditions irrespective of the counterface material. The optimization of the response variables (coefficient-of-friction (COF) and specific wear rate (WR)) was performed using optimization techniques (Taguchi and Grey relational analysis). It was revealed that Ti6Al4V counterface material under synovial fluid lubrication and normal load of 52 N exhibits the optimal tribological performance with UHWMPE. The contribution of process parameters on the COF and WR w...

Research on Engineering Structures and Materials, 2022

Disclaimer All the opinions and statements expressed in the papers are on the responsibility of a... more Disclaimer All the opinions and statements expressed in the papers are on the responsibility of author(s) and are not to be regarded as those of the journal of Research on Engineering Structures and Materials (RESM) organization or related parties. The publishers make no warranty, explicit or implied, or make any representation with respect to the contents of any article will be complete or accurate or up to date. The accuracy of any instructions, equations, or other information should be independently verified. The publisher and related parties shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with use of the information given in the journal or related means. Published articles are freely available to users under the terms of Creative Commons Attribution-NonCommercial 4.0 International Public License, as currently displayed at here (the "CC BY-NC").

MatSciRN: Other Materials Processing & Manufacturing (Topic), 2018

Herein, the tribological behavior of virgin polytetrafluoroethylene against stainless steel is in... more Herein, the tribological behavior of virgin polytetrafluoroethylene against stainless steel is investigated in natural sea water, distilled water and dry running conditions by means of pin on disc reciprocating tribo-tester. The tribo-tests were carried out under ambient conditions at10N normal load. PTFE displayed better tribo-performance in natural sea water relative to distilled water environment and dry sliding. A reduction in specific wear rate of one order magnitude is observed under sea water environment compared to other testing conditions. The minimum COF (0.0310) is noticed in sea water environment.

IOP Conference Series: Materials Science and Engineering, 2020

Effusion cooling technique is an advanced concept for reducing the wall temperature in combustion... more Effusion cooling technique is an advanced concept for reducing the wall temperature in combustion chamber liners and gas turbine blades by injecting cross flow secondary fluid (coolant) through an array of holes having small diameter at close spacing. From last two decades, extensive works have been done for improving the life of hot components of gas turbines by different cooling methods. This paper discusses the review of the literature related to the geometrical parameter effects and factors affecting the adiabatic effectiveness of effusion cooling.

Materials Today: Proceedings, 2019

This study presents the effect of load on friction and wear behaviour of 23-8N valve-steel agains... more This study presents the effect of load on friction and wear behaviour of 23-8N valve-steel against GGG-60 cast-iron under non-lubricated sliding conditions, at ambient temperature. Coefficient of friction (m) was observed to decline steadily with test duration for all tests with salient running-in behaviour discerned at room temperature. This continuous decrement was attributed to the compaction of the glazed layer. The study found that the average value of coefficient of friction showed an increasing trend as the load was increased, as predicted by Amonton's law of friction. The weight loss incurred in the seat material was found to increase with increasing value of load, which follows Archard's wear-relation.

Journal of Physics: Conference Series, 2019

The present paper aims at evaluating the tribological performance of virgin and glass fiber fille... more The present paper aims at evaluating the tribological performance of virgin and glass fiber filled PTFE against different steel counterfaces to co-relate the effect of material and counterface hardness on friction and wear performance. The influence of load on friction and wear of virgin and glass fiber filled PTFE is also studied. The experiments were designed according to Taguchi’s L18 orthogonal array and conducted on a pin on disc reciprocating tribometer. Analysis of variance was used to determine the effect of various parameters on coefficient of friction and wear rate. The results revealed that the counterface hardness is the dominant factor affecting the COF and the material hardness is the dominant factor influencing the wear rate. Regression analysis was carried out to predict the outcomes of the experiments. The predicted and measured values show a good degree of proximity. Further, confirmation tests were also conducted with the random parameter combinations for validati...

SSRN Electronic Journal, 2018

In the present work, the effects of machining factor on tool wear of coated CBN and coated carbid... more In the present work, the effects of machining factor on tool wear of coated CBN and coated carbide tools during hard turning of AISI D2 steel are evaluated. Cutting speed, machining time and feed rate at three levels were selected as cutting variables. By adopting RSM technique with FCCD and using analysis of variance, the influence of cutting parameters on tool wear was explored. The results showed that the machining time was most significant factor on the tool wear criteria with respective contribution of (60.28) % for coated CBN insert by against a respective contribution of (68.89) % for coated carbide insert followed cutting speed with respective contribution of (30.34) % for coated CBN and (20.08) % for coated carbide inserts respectively. Normally, coated CBN insert had shown the better performance as comparing with coated carbide tools in terms of less tool wear and increased surface finish.

SSRN Electronic Journal, 2018

Nanoscratch test was performed on self-lubricating Ti/MoS 2 coating of 99.79 nm thickness prepare... more Nanoscratch test was performed on self-lubricating Ti/MoS 2 coating of 99.79 nm thickness prepared by pulse laser deposited technique on Al-13Si substrate. The surface morphology and surface elemental analysis of Ti/MoS 2 were studied using Scanning electron microscope integrated with Energy dispersive X-ray spectroscopy. The structural analysis of Ti/MoS 2 coating was conducted using X-ray diffraction and Raman spectroscopy. Nanoscratch tests were carried out at low load of 250-1250 µN to examine the deformation and failure behaviour of the coating/substrate system. The results indicate that Ti/MoS 2 coating show better adhesion strength at low loads. Also, in-situ scanning probe microscope images of Ti/MoS 2 coating shows plastic flow of coating with no debris and cracks on the surface. Thus, the mode of wear mechanism is mainly ductile and abrasive.

SSRN Electronic Journal, 2018

Fe-based materials play a significant role in engineering applications as bearings and gears owin... more Fe-based materials play a significant role in engineering applications as bearings and gears owing due to their low cost, ease of manufacture, high strength, availability, and good wear resistance and low coefficient of friction. In this study, molybdenum di sulfide added Fe-Cu-Sn alloy is developed using simple single stage compaction and sintering elemental powders. The friction and wear behaviors of the sintered alloys sliding against EN8 steel ball under dry conditions were studied using a ball-on-disc tribometer. The interconnected porosity decreases and density increases with added molybdenum di sulfide. The hardness of the molybdenum disulfide added compositions are better than the base composition. The composition with higher wt% of molybdenum di sulfide is found to be beneficial in improving friction and wear characteristics. The wear mechanism in base composition is observed to be adhesive and abrasive, while as mild abrasive wear is observed in the 3 wt% molybdenum di sulfide added sample.

SSRN Electronic Journal, 2018

Nano-mechanical tests were performed on MAX Phase material Ti2AlC sample prepared by hot pressing... more Nano-mechanical tests were performed on MAX Phase material Ti2AlC sample prepared by hot pressing. Roughness of 0.002 µm of the Ti2AlC sample was measured by Optical 3D profilometer. Nano-indentation tests were conducted at low loads 3000-9000 µN. The nanomechanical properties were analysed from the unloading segment of the nanoindentation load-displacement curve using Oliver-Pharr method. The results indicate that Ti2AlC shows decrease in Young's modulus and hardness with increase in load.

Materials Chemistry and Physics, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Materials Letters, May 1, 2021

Abstract This paper presents the fabrication of UHMWPE/nano-Al2O3/Vitamin-C hybrid composites sui... more Abstract This paper presents the fabrication of UHMWPE/nano-Al2O3/Vitamin-C hybrid composites suitable for use as artificial cartilages in total joint prosthesis. Three composite variations were fabricated using the hot press technique, keeping the Vitamin C weight percentage constant at 2% and varying Al2O3 weight percentage by 0.5%, 1% and 2% respectively. Al2O3 was used as an anti-wear additive in UHMWPE and Vitamin C was used as an anti-oxidant. The fabricated composite pins were subjected to wear tests against Ti6Al4V alloy under dry sliding and human serum lubrication. It was observed that the 2 wt% Al2O3 filled UHMWPE showed better wear performance than the other composites and that human serum adheres to the surface of the composite pins upon sliding. This leads to the formation of a film which results in better wear resistance of the composite pins under human serum lubrication than dry sliding.

Journal of Thermoplastic Composite Materials, Jul 28, 2020

The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight po... more The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight polyethylene (UHMWPE) with 316L stainless steel and Ti6Al4V under dry and lubricated sliding conditions using human body fluids (synovial fluid and human serum). Eighteen trials of experiments were performed using a reciprocating sliding tribometer (pin-on-disc) at 37 C based on Taguchi's L 18 (2 1 Â 3 2) array. The in-vitro experimental results revealed that UHMWPE offers better tribological performance under synovial fluid lubrication conditions irrespective of the counterface material. The optimization of the response variables (coefficient-of-friction (COF) and specific wear rate (WR)) was performed using optimization techniques (Taguchi and Grey relational analysis). It was revealed that Ti6Al4V counterface material under synovial fluid lubrication and normal load of 52 N exhibits the optimal tribological performance with UHWMPE. The contribution of process parameters on the COF and WR was evaluated using analysis of variance. It was established that load is the most significant parameter, affecting COF and WR.

Engineering Research Express

This study aims at exploring the improvement in extreme pressure (EP) properties with addition of... more This study aims at exploring the improvement in extreme pressure (EP) properties with addition of natural Garlic oil as EP additive. Comparative investigations were conducted on PAO4 base oil, Natural Garlic oil (NGO) and PAO4 + 1 wt% NGO (Natural Garlic Oil) for evaluating the extreme pressure properties. The EP tests were conducted on a four ball tester according to ASTM D 2783. The results revealed that NGO possesses significantly good extreme pressure properties having a weld load of 3087N and load wear index of 513N. The results also revealed that NGO could significantly improve the weld load and load wear index of PAO4 base oil. After adding 1 wt% garlic oil to PAO4 the load wear index increased by 62.51% and weld load increased by 25%. This study proposes garlic oil as a replacement to the use of nano-particles as EP additives and aims to eliminate the disadvantages that are prominent with nano-particles without comprising the performance.

Polymers and Polymer Composites, 2021

Ultra high molecular weight polyethylene (UHMWPE) is widely used for articulating surfaces in tot... more Ultra high molecular weight polyethylene (UHMWPE) is widely used for articulating surfaces in total hip and knee replacements. In the present work, the tribological properties of UHMWPE-based nano composites were studied in order to meet the demands of current bearing applications. UHMWPE matrix reinforced with 0.5, 1, and 2 weight percentage of alumina nano powder were fabricated by hot pressing. The dispersion and microstructure of composite material was established by X-ray diffraction (XRD) and scanning electron microscope (SEM) micrograph. The tests were carried out on a reciprocating sliding pin-on-disc tribometer at human body temperature (37±1°C) under dry and human serum lubricating environments for a normal load of 46 N and 52 N, a constant sliding speed of 4 mm. Under these testing conditions, it has been observed that the wear behavior of the developed composites improved with increase in weight percentage of alumina nano powder. The results show that at 52 N load, the m...

Industrial Lubrication and Tribology, 2021

Purpose This study aims to fabricate and investigate the tribological performance of ultra-high m... more Purpose This study aims to fabricate and investigate the tribological performance of ultra-high molecular weight polyethylene (UHMWPE)-based composite materials reinforced with 0.5, 1 and 2 weight percentage of graphene nanoplatelets (GNPs) while keeping the weight percentage of vitamin C constant at 2% for each composite. Design/methodology/approach In this paper, the composites were fabricated using hot pressing, and the dispersion of GNP/vitamin C/UHMWPE hybrid composite was investigated by X-ray diffraction. Experimental trials were performed according to ASTM F732 on a reciprocating sliding tribometer (pin-on-disc) at human body temperature of 37 ± 1 °C, for a load of 52 N, to assess the role of these fillers on the tribological properties of UHMWPE against Ti6Al4V counter body material under dry and lubricating (human serum) environment. Findings In this study, it has been observed that friction and wear behavior of the developed composites improve with increase in weight perc...

Journal of Thermal Analysis and Calorimetry

Materials Today: Proceedings

International Journal of Materials Engineering Innovation

Journal of Thermoplastic Composite Materials

The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight po... more The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight polyethylene (UHMWPE) with 316L stainless steel and Ti6Al4V under dry and lubricated sliding conditions using human body fluids (synovial fluid and human serum). Eighteen trials of experiments were performed using a reciprocating sliding tribometer (pin-on-disc) at 37°C based on Taguchi’s L18 (21 × 32) array. The in-vitro experimental results revealed that UHMWPE offers better tribological performance under synovial fluid lubrication conditions irrespective of the counterface material. The optimization of the response variables (coefficient-of-friction (COF) and specific wear rate (WR)) was performed using optimization techniques (Taguchi and Grey relational analysis). It was revealed that Ti6Al4V counterface material under synovial fluid lubrication and normal load of 52 N exhibits the optimal tribological performance with UHWMPE. The contribution of process parameters on the COF and WR w...

Research on Engineering Structures and Materials, 2022

Disclaimer All the opinions and statements expressed in the papers are on the responsibility of a... more Disclaimer All the opinions and statements expressed in the papers are on the responsibility of author(s) and are not to be regarded as those of the journal of Research on Engineering Structures and Materials (RESM) organization or related parties. The publishers make no warranty, explicit or implied, or make any representation with respect to the contents of any article will be complete or accurate or up to date. The accuracy of any instructions, equations, or other information should be independently verified. The publisher and related parties shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with use of the information given in the journal or related means. Published articles are freely available to users under the terms of Creative Commons Attribution-NonCommercial 4.0 International Public License, as currently displayed at here (the "CC BY-NC").

MatSciRN: Other Materials Processing & Manufacturing (Topic), 2018

Herein, the tribological behavior of virgin polytetrafluoroethylene against stainless steel is in... more Herein, the tribological behavior of virgin polytetrafluoroethylene against stainless steel is investigated in natural sea water, distilled water and dry running conditions by means of pin on disc reciprocating tribo-tester. The tribo-tests were carried out under ambient conditions at10N normal load. PTFE displayed better tribo-performance in natural sea water relative to distilled water environment and dry sliding. A reduction in specific wear rate of one order magnitude is observed under sea water environment compared to other testing conditions. The minimum COF (0.0310) is noticed in sea water environment.

IOP Conference Series: Materials Science and Engineering, 2020

Effusion cooling technique is an advanced concept for reducing the wall temperature in combustion... more Effusion cooling technique is an advanced concept for reducing the wall temperature in combustion chamber liners and gas turbine blades by injecting cross flow secondary fluid (coolant) through an array of holes having small diameter at close spacing. From last two decades, extensive works have been done for improving the life of hot components of gas turbines by different cooling methods. This paper discusses the review of the literature related to the geometrical parameter effects and factors affecting the adiabatic effectiveness of effusion cooling.

Materials Today: Proceedings, 2019

This study presents the effect of load on friction and wear behaviour of 23-8N valve-steel agains... more This study presents the effect of load on friction and wear behaviour of 23-8N valve-steel against GGG-60 cast-iron under non-lubricated sliding conditions, at ambient temperature. Coefficient of friction (m) was observed to decline steadily with test duration for all tests with salient running-in behaviour discerned at room temperature. This continuous decrement was attributed to the compaction of the glazed layer. The study found that the average value of coefficient of friction showed an increasing trend as the load was increased, as predicted by Amonton's law of friction. The weight loss incurred in the seat material was found to increase with increasing value of load, which follows Archard's wear-relation.

Journal of Physics: Conference Series, 2019

The present paper aims at evaluating the tribological performance of virgin and glass fiber fille... more The present paper aims at evaluating the tribological performance of virgin and glass fiber filled PTFE against different steel counterfaces to co-relate the effect of material and counterface hardness on friction and wear performance. The influence of load on friction and wear of virgin and glass fiber filled PTFE is also studied. The experiments were designed according to Taguchi’s L18 orthogonal array and conducted on a pin on disc reciprocating tribometer. Analysis of variance was used to determine the effect of various parameters on coefficient of friction and wear rate. The results revealed that the counterface hardness is the dominant factor affecting the COF and the material hardness is the dominant factor influencing the wear rate. Regression analysis was carried out to predict the outcomes of the experiments. The predicted and measured values show a good degree of proximity. Further, confirmation tests were also conducted with the random parameter combinations for validati...

SSRN Electronic Journal, 2018

In the present work, the effects of machining factor on tool wear of coated CBN and coated carbid... more In the present work, the effects of machining factor on tool wear of coated CBN and coated carbide tools during hard turning of AISI D2 steel are evaluated. Cutting speed, machining time and feed rate at three levels were selected as cutting variables. By adopting RSM technique with FCCD and using analysis of variance, the influence of cutting parameters on tool wear was explored. The results showed that the machining time was most significant factor on the tool wear criteria with respective contribution of (60.28) % for coated CBN insert by against a respective contribution of (68.89) % for coated carbide insert followed cutting speed with respective contribution of (30.34) % for coated CBN and (20.08) % for coated carbide inserts respectively. Normally, coated CBN insert had shown the better performance as comparing with coated carbide tools in terms of less tool wear and increased surface finish.

SSRN Electronic Journal, 2018

Nanoscratch test was performed on self-lubricating Ti/MoS 2 coating of 99.79 nm thickness prepare... more Nanoscratch test was performed on self-lubricating Ti/MoS 2 coating of 99.79 nm thickness prepared by pulse laser deposited technique on Al-13Si substrate. The surface morphology and surface elemental analysis of Ti/MoS 2 were studied using Scanning electron microscope integrated with Energy dispersive X-ray spectroscopy. The structural analysis of Ti/MoS 2 coating was conducted using X-ray diffraction and Raman spectroscopy. Nanoscratch tests were carried out at low load of 250-1250 µN to examine the deformation and failure behaviour of the coating/substrate system. The results indicate that Ti/MoS 2 coating show better adhesion strength at low loads. Also, in-situ scanning probe microscope images of Ti/MoS 2 coating shows plastic flow of coating with no debris and cracks on the surface. Thus, the mode of wear mechanism is mainly ductile and abrasive.

SSRN Electronic Journal, 2018

Fe-based materials play a significant role in engineering applications as bearings and gears owin... more Fe-based materials play a significant role in engineering applications as bearings and gears owing due to their low cost, ease of manufacture, high strength, availability, and good wear resistance and low coefficient of friction. In this study, molybdenum di sulfide added Fe-Cu-Sn alloy is developed using simple single stage compaction and sintering elemental powders. The friction and wear behaviors of the sintered alloys sliding against EN8 steel ball under dry conditions were studied using a ball-on-disc tribometer. The interconnected porosity decreases and density increases with added molybdenum di sulfide. The hardness of the molybdenum disulfide added compositions are better than the base composition. The composition with higher wt% of molybdenum di sulfide is found to be beneficial in improving friction and wear characteristics. The wear mechanism in base composition is observed to be adhesive and abrasive, while as mild abrasive wear is observed in the 3 wt% molybdenum di sulfide added sample.

SSRN Electronic Journal, 2018

Nano-mechanical tests were performed on MAX Phase material Ti2AlC sample prepared by hot pressing... more Nano-mechanical tests were performed on MAX Phase material Ti2AlC sample prepared by hot pressing. Roughness of 0.002 µm of the Ti2AlC sample was measured by Optical 3D profilometer. Nano-indentation tests were conducted at low loads 3000-9000 µN. The nanomechanical properties were analysed from the unloading segment of the nanoindentation load-displacement curve using Oliver-Pharr method. The results indicate that Ti2AlC shows decrease in Young's modulus and hardness with increase in load.