Norinsan Kamil Othman | Universiti Kebangsaan Malaysia (original) (raw)

Papers by Norinsan Kamil Othman

Advanced Materials Research, 2010

Fe-Cr binary model alloys (Cr: 25 wt %) with additions of 0.09 wt% lanthanum were subjected to cy... more Fe-Cr binary model alloys (Cr: 25 wt %) with additions of 0.09 wt% lanthanum were subjected to cyclic oxidation experiments at 700oC. All model alloys were exposed in five different gases; Ar-20O2, Ar-20O2-5H2O, Ar-5O2-20H2O, Ar-10H2-5H2O (pO2 = 3.64 x 10-22 atm) and Ar-10H2-20H2O (pO2 = 7.37 x 10-21 atm) all in volume %. Very low weight gains were observed in all gases of Fe-25Cr-0.09La. However, breakaway oxidation occurred on La-free alloy experienced increased weight gain in Ar-5O2-20H2O due to formation of iron-rich oxide. The addition of La (<0.1 wt%) to the Fe25Cr retarded the growth of iron-rich oxide in Ar-5O2-20H2O.

Oxidation of Metals, 2010

Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was mea... more Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was measured using continuous thermogravimetric analysis. All alloys developed thin, protective chromia scales in Ar-20O 2 (vol%). Chromia scale growth on the 17 and 25 Cr alloys was faster in Ar-20O 2-5H 2 O and Ar-5O 2-20H 2 O. In these gases, the Fe-9Cr failed to form a chromia scale and suffered rapid breakaway oxidation, growing iron-rich oxides instead. A low oxygen potential gas, Ar-10H 2-5H 2 O caused chromia scaling on Fe-17Cr and Fe-25Cr, but internal oxidation of Fe-9Cr. Application of Wagner's criterion for sustaining external scale growth is shown to account satisfactorily for these observations.

... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead ... more ... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead (QFN) 4mm X 4mm package that built up from double stacked die and bonded with 25 um diameter of Au wires has been used as samples throughout the analysis. ...

... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead ... more ... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead (QFN) 4mm X 4mm package that built up from double stacked die and bonded with 25 um diameter of Au wires has been used as samples throughout the analysis. ...

Transactions of Nonferrous Metals Society of China, 2016

2011 International Symposium on Advanced Packaging Materials (APM), 2011

Page 1. 226 The Re-Evaluation of Mechanical Properties of Wire Bonding Azman Jalar a , Muhammad N... more Page 1. 226 The Re-Evaluation of Mechanical Properties of Wire Bonding Azman Jalar a , Muhammad Nubli Zulkifli a , Norinsan Kamil Othman b and Shahrum Abdullah c a Institute of Microengineering and Nanoelectronic (IMEN), ...

Electrochemistry, 2015

We report an improved performance of a carbon-based supercapacitor using etched stainless steel (... more We report an improved performance of a carbon-based supercapacitor using etched stainless steel (SS) current collector deposited with platinum nanoparticles (PtNs) over bare SS current collector/un-etched SS current collector deposited with PtNs. The PtNs grown on the etched surface of the current collectors provides a better contact with the surface of activated carbon monoliths electrode prepared from pre-carbonizedfibres of oil palm empty fruit bunches. X-ray diffraction,field-emission scanning electron microscopy, the energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy were employed to investigate the different properties of bare SS current collector and the modified current collector. Electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge–discharge results consistently suggest that the deposition of PtNs on the etched surface of the current collector causes an increase in specific capacitance of 10% (from 105 to 115 F g −1 ), 4% (from 141 to 146 F g −1 ) and 6% (from 142 to 150 F g −1 ) respectively. Correspondingly, the specific energy increases from 4.12 to 4.51 Wh kg −1 and specific power from 173 to 196 Wkg −1 . Also EIS and GCD results respectively show a decrease of 47% (from 1.332 to 0.710Ω) and 44% (from 1.75 to 0.974Ω) in equivalent series resistance.

Anti-Corrosion Methods and Materials, 2015

Oxidation of Metals, 2010

Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was mea... more Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was measured using continuous thermogravimetric analysis. All alloys developed thin, protective chromia scales in Ar-20O 2 (vol%). Chromia scale growth on the 17 and 25 Cr alloys was faster in Ar-20O 2 -5H 2 O and Ar-5O 2 -20H 2 O. In these gases, the Fe-9Cr failed to form a chromia scale and suffered rapid breakaway oxidation, growing iron-rich oxides instead. A low oxygen potential gas, Ar-10H 2 -5H 2 O caused chromia scaling on Fe-17Cr and Fe-25Cr, but internal oxidation of Fe-9Cr. Application of Wagner's criterion for sustaining external scale growth is shown to account satisfactorily for these observations.

Advances in Materials Science and Engineering, 2014

ABSTRACT Al-Mg-Si (AA6061) Al alloy plates were joined by the method of gas metal arc welding usi... more ABSTRACT Al-Mg-Si (AA6061) Al alloy plates were joined by the method of gas metal arc welding using Al-5Mg (ER5356) filler metal and were subjected to the oxidation test in flowing air environment at from 8 to 40 hours and the weight gain was measured. The characteristic of oxide grown on welded zone surface was examined by SEM/EDS, XRD, and XPS. Oxide was observed to grow on the fused metal surface suggesting the possibility of modifying the oxide chemistry under high temperature environment. It was found that the oxidation behavior of fused metal affected by the nature of their oxide growth and morphology, was influenced by their welding process and the difference in the chemical composition.

Key Engineering Materials, 2012

ABSTRACT This paper presents an investigation on microstructure and mechanical properties of weld... more ABSTRACT This paper presents an investigation on microstructure and mechanical properties of welded AA 6061-T6 plate using filler metal ER 4043 in the Gas Metal Arc Welding (GMAW) process. Double pass welding technique on both sides of 5 mm thick plate or more is required to provide sufficient weld pool in the joint. The weld metal of the first welding pass exhibits finer microstructure than the second welding pass. The size of Mg2Si precipitations in the heat-affected zone (HAZ) region is larger than in the base metal due to the welding process that reheats the alloy from the T6 condition above the eutectic temperature. Rapid cooling of the first pass and moderate cooling rate for the second pass during weld metal solidification eventually resulted in significantly change the shape and size in the microstructure that had affected the hardness and mechanical properties. Comparisons made to the base metal on the hardness test results found that the hardness of first pass weld metal dropped by 15%, and by 37.5% for the second weld metal, while the hardness at the boundaries of the first and second weld metals dropped by 32.5%. The ultimate tensile strength and strain of the weld joint with ER 4043 also decreased by 48% and 94% respectively. Based on the findings of the study, it is concluded that even though the double sided welding technique is able to overcome shallow weld penetration to avoid stress concentration that leads to the fatigue failure, the metallurgical changes eventually contributes to degradation of mechanical properties.

Journal of Radioanalytical and Nuclear Chemistry, 2014

Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Bu... more Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Budapest, Hungary. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".

Advanced Materials Research, 2015

Applied Mechanics and Materials, 2011

... 1) Welds made with Al-Mg5% filler wires exhibited larger size but similar in shape of porosit... more ... 1) Welds made with Al-Mg5% filler wires exhibited larger size but similar in shape of porosity compared to those made with Al-Mg5% based filler wires. ... [17] NA Che Lah, MF Ahmad Ibrahim, A. Jalar, J. Syarif, NK Othman and N. M Rashdi: Adv. Mater. ... [20] AAA Aziz, MFA Ibrahim ...

Nanoscale Research Letters, 2013

This review presents an introduction to the synthesis of metallic nanoparticles by radiation-indu... more This review presents an introduction to the synthesis of metallic nanoparticles by radiation-induced method, especially gamma irradiation. This method offers some benefits over the conventional methods because it provides fully reduced and highly pure nanoparticles free from by-products or chemical reducing agents, and is capable of controlling the particle size and structure. The nucleation and growth mechanism of metallic nanoparticles are also discussed. The competition between nucleation and growth process in the formation of nanoparticles can determine the size of nanoparticles which is influenced by certain parameters such as the choice of solvents and stabilizer, the precursor to stabilizer ratio, pH during synthesis, and absorbed dose.

Advanced Science Letters, 2013

ABSTRACT Gas metal arc welding (GMAW) and double sided welding techniques were used to join 6 mm ... more ABSTRACT Gas metal arc welding (GMAW) and double sided welding techniques were used to join 6 mm thick AA6061-T6 aluminium alloys plates. The ER5356 sample exhibited greater grain size and thicker grain boundary than the ER4043 sample due to higher range of heat distribution during the welding process. The fusion boundary for the ER4043 sample can be seen clearly, but for the ER5356 sample, a part of the base metal has been found to be fused and dissolved with the weld metal. The weld metal of the first welding pass exhibited finer microstructure than the second welding pass for both samples. As compared to the base metal, the ultimate tensile strength and strain of the ER4043 sample decreased by 48% and 94% respectively, while for the ER5356 sample, the degradation of strength and strain is slightly lower, 41% and 62% respectively. The hardness of the HAZ regions is tremendously decreased and immeasurable at close distances to the weld metal.

Advanced Materials Research, 2010

Fe-Cr binary model alloys (Cr: 25 wt %) with additions of 0.09 wt% lanthanum were subjected to cy... more Fe-Cr binary model alloys (Cr: 25 wt %) with additions of 0.09 wt% lanthanum were subjected to cyclic oxidation experiments at 700oC. All model alloys were exposed in five different gases; Ar-20O2, Ar-20O2-5H2O, Ar-5O2-20H2O, Ar-10H2-5H2O (pO2 = 3.64 x 10-22 atm) and Ar-10H2-20H2O (pO2 = 7.37 x 10-21 atm) all in volume %. Very low weight gains were observed in all gases of Fe-25Cr-0.09La. However, breakaway oxidation occurred on La-free alloy experienced increased weight gain in Ar-5O2-20H2O due to formation of iron-rich oxide. The addition of La (<0.1 wt%) to the Fe25Cr retarded the growth of iron-rich oxide in Ar-5O2-20H2O.

Oxidation of Metals, 2010

Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was mea... more Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was measured using continuous thermogravimetric analysis. All alloys developed thin, protective chromia scales in Ar-20O 2 (vol%). Chromia scale growth on the 17 and 25 Cr alloys was faster in Ar-20O 2-5H 2 O and Ar-5O 2-20H 2 O. In these gases, the Fe-9Cr failed to form a chromia scale and suffered rapid breakaway oxidation, growing iron-rich oxides instead. A low oxygen potential gas, Ar-10H 2-5H 2 O caused chromia scaling on Fe-17Cr and Fe-25Cr, but internal oxidation of Fe-9Cr. Application of Wagner's criterion for sustaining external scale growth is shown to account satisfactorily for these observations.

... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead ... more ... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead (QFN) 4mm X 4mm package that built up from double stacked die and bonded with 25 um diameter of Au wires has been used as samples throughout the analysis. ...

... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead ... more ... Page 2. Experimental Works High Temperature Storage (HTS): The as-received Quad Flat No-Lead (QFN) 4mm X 4mm package that built up from double stacked die and bonded with 25 um diameter of Au wires has been used as samples throughout the analysis. ...

Transactions of Nonferrous Metals Society of China, 2016

2011 International Symposium on Advanced Packaging Materials (APM), 2011

Page 1. 226 The Re-Evaluation of Mechanical Properties of Wire Bonding Azman Jalar a , Muhammad N... more Page 1. 226 The Re-Evaluation of Mechanical Properties of Wire Bonding Azman Jalar a , Muhammad Nubli Zulkifli a , Norinsan Kamil Othman b and Shahrum Abdullah c a Institute of Microengineering and Nanoelectronic (IMEN), ...

Electrochemistry, 2015

We report an improved performance of a carbon-based supercapacitor using etched stainless steel (... more We report an improved performance of a carbon-based supercapacitor using etched stainless steel (SS) current collector deposited with platinum nanoparticles (PtNs) over bare SS current collector/un-etched SS current collector deposited with PtNs. The PtNs grown on the etched surface of the current collectors provides a better contact with the surface of activated carbon monoliths electrode prepared from pre-carbonizedfibres of oil palm empty fruit bunches. X-ray diffraction,field-emission scanning electron microscopy, the energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy were employed to investigate the different properties of bare SS current collector and the modified current collector. Electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge–discharge results consistently suggest that the deposition of PtNs on the etched surface of the current collector causes an increase in specific capacitance of 10% (from 105 to 115 F g −1 ), 4% (from 141 to 146 F g −1 ) and 6% (from 142 to 150 F g −1 ) respectively. Correspondingly, the specific energy increases from 4.12 to 4.51 Wh kg −1 and specific power from 173 to 196 Wkg −1 . Also EIS and GCD results respectively show a decrease of 47% (from 1.332 to 0.710Ω) and 44% (from 1.75 to 0.974Ω) in equivalent series resistance.

Anti-Corrosion Methods and Materials, 2015

Oxidation of Metals, 2010

Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was mea... more Isothermal oxidation at 700°C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was measured using continuous thermogravimetric analysis. All alloys developed thin, protective chromia scales in Ar-20O 2 (vol%). Chromia scale growth on the 17 and 25 Cr alloys was faster in Ar-20O 2 -5H 2 O and Ar-5O 2 -20H 2 O. In these gases, the Fe-9Cr failed to form a chromia scale and suffered rapid breakaway oxidation, growing iron-rich oxides instead. A low oxygen potential gas, Ar-10H 2 -5H 2 O caused chromia scaling on Fe-17Cr and Fe-25Cr, but internal oxidation of Fe-9Cr. Application of Wagner's criterion for sustaining external scale growth is shown to account satisfactorily for these observations.

Advances in Materials Science and Engineering, 2014

ABSTRACT Al-Mg-Si (AA6061) Al alloy plates were joined by the method of gas metal arc welding usi... more ABSTRACT Al-Mg-Si (AA6061) Al alloy plates were joined by the method of gas metal arc welding using Al-5Mg (ER5356) filler metal and were subjected to the oxidation test in flowing air environment at from 8 to 40 hours and the weight gain was measured. The characteristic of oxide grown on welded zone surface was examined by SEM/EDS, XRD, and XPS. Oxide was observed to grow on the fused metal surface suggesting the possibility of modifying the oxide chemistry under high temperature environment. It was found that the oxidation behavior of fused metal affected by the nature of their oxide growth and morphology, was influenced by their welding process and the difference in the chemical composition.

Key Engineering Materials, 2012

ABSTRACT This paper presents an investigation on microstructure and mechanical properties of weld... more ABSTRACT This paper presents an investigation on microstructure and mechanical properties of welded AA 6061-T6 plate using filler metal ER 4043 in the Gas Metal Arc Welding (GMAW) process. Double pass welding technique on both sides of 5 mm thick plate or more is required to provide sufficient weld pool in the joint. The weld metal of the first welding pass exhibits finer microstructure than the second welding pass. The size of Mg2Si precipitations in the heat-affected zone (HAZ) region is larger than in the base metal due to the welding process that reheats the alloy from the T6 condition above the eutectic temperature. Rapid cooling of the first pass and moderate cooling rate for the second pass during weld metal solidification eventually resulted in significantly change the shape and size in the microstructure that had affected the hardness and mechanical properties. Comparisons made to the base metal on the hardness test results found that the hardness of first pass weld metal dropped by 15%, and by 37.5% for the second weld metal, while the hardness at the boundaries of the first and second weld metals dropped by 32.5%. The ultimate tensile strength and strain of the weld joint with ER 4043 also decreased by 48% and 94% respectively. Based on the findings of the study, it is concluded that even though the double sided welding technique is able to overcome shallow weld penetration to avoid stress concentration that leads to the fatigue failure, the metallurgical changes eventually contributes to degradation of mechanical properties.

Journal of Radioanalytical and Nuclear Chemistry, 2014

Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Bu... more Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Budapest, Hungary. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".

Advanced Materials Research, 2015

Applied Mechanics and Materials, 2011

... 1) Welds made with Al-Mg5% filler wires exhibited larger size but similar in shape of porosit... more ... 1) Welds made with Al-Mg5% filler wires exhibited larger size but similar in shape of porosity compared to those made with Al-Mg5% based filler wires. ... [17] NA Che Lah, MF Ahmad Ibrahim, A. Jalar, J. Syarif, NK Othman and N. M Rashdi: Adv. Mater. ... [20] AAA Aziz, MFA Ibrahim ...

Nanoscale Research Letters, 2013

This review presents an introduction to the synthesis of metallic nanoparticles by radiation-indu... more This review presents an introduction to the synthesis of metallic nanoparticles by radiation-induced method, especially gamma irradiation. This method offers some benefits over the conventional methods because it provides fully reduced and highly pure nanoparticles free from by-products or chemical reducing agents, and is capable of controlling the particle size and structure. The nucleation and growth mechanism of metallic nanoparticles are also discussed. The competition between nucleation and growth process in the formation of nanoparticles can determine the size of nanoparticles which is influenced by certain parameters such as the choice of solvents and stabilizer, the precursor to stabilizer ratio, pH during synthesis, and absorbed dose.

Advanced Science Letters, 2013

ABSTRACT Gas metal arc welding (GMAW) and double sided welding techniques were used to join 6 mm ... more ABSTRACT Gas metal arc welding (GMAW) and double sided welding techniques were used to join 6 mm thick AA6061-T6 aluminium alloys plates. The ER5356 sample exhibited greater grain size and thicker grain boundary than the ER4043 sample due to higher range of heat distribution during the welding process. The fusion boundary for the ER4043 sample can be seen clearly, but for the ER5356 sample, a part of the base metal has been found to be fused and dissolved with the weld metal. The weld metal of the first welding pass exhibited finer microstructure than the second welding pass for both samples. As compared to the base metal, the ultimate tensile strength and strain of the ER4043 sample decreased by 48% and 94% respectively, while for the ER5356 sample, the degradation of strength and strain is slightly lower, 41% and 62% respectively. The hardness of the HAZ regions is tremendously decreased and immeasurable at close distances to the weld metal.