Abrasive wear study of AA7075/ZrB2 reinforced composites (original) (raw)
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Dry sliding wear behaviour of AA 6351-ZrB 2 in situ composite at room temperature
Materials & Design, 2010
In the present work, AA 6351-xZrB 2 [x = 0, 3, 6 and 9 weight percentage (wt.%)] in situ composites have been prepared by the reaction of mixture of K 2 ZrF 6 and KBF 4 with molten aluminium alloy at a reaction temperature of 850°C. The in situ prepared composites were characterized by using scanning electron microscope (SEM), X-ray diffractometer (XRD), and microhardness analysis. The sliding wear properties of the prepared composite at room temperature were estimated by a pin-on-disc wear testing equipment using the composite material; the pins were machined according to standard sizes, and the tests were conducted as per the standards recommended by the ASTM G99-95a designation of different weighing percentage at room temperature. The wear characteristics of the composite in the as-cast, the solutionized and the solutionized-aged conditions were studied by conducting sliding wear test at the load of 9.81 N. The results indicated that the wear rate was decreased with an increase in the weight percentage of ZrB 2 and the wear resistance was increased with an increase in the fraction of ZrB 2 particulates in composite before and after heat treatment.
A STUDY ON WEAR BEHAVIOR OF Aa6061-Zrb2 COMPOSITES BY USING PIN ON DISC
International Journal of Engineering Applied Sciences and Technology
Aluminum alloy AA6061 reinforced with ZrB2 particles by stir casting technique. ZrB2 was manufactured by using from K2ZrF6 and KBF4 salts. The reinforcement percentage of ZrB2 is taken at 9%, 11%, and 13%. The AA6061-ZrB2 composite was manufactured for different stirrer speeds and different furnace temperature. The coefficient of friction of manufactured composite is determined by using Pin on Disc Setup in which the pin is made up of AA6061-ZrB2 composite.
In the present work, ZrB 2 /Al alloy composites were processed through the salt-melt reaction technique. Aluminum alloy (LM4) was taken as a matrix material. The ZrB 2 reinforcement particles were formed in-situ by the reaction of precursor salts K 2 ZrF 6 and KBF 4 within the aluminum melt. Relative to the parent alloy, the hardness of the composites reinforced with 2.5, 5 and 7.5 wt.% ZrB 2 showed an increase of 8.24%, 17.64% and 33.77%, respectively. The tensile strength also improved initially but decreased when the amount of reinforcement exceeded 5-wt.%. The elongation varied in the same fashion as the tensile strength. The microstructure of the composites showed moderately uniform distribution of particles. However, agglomeration of reinforcement particles became a problem at the highest amount of reinforcement. Wear experiments to determine the influence of load, sliding velocity, sliding distance and the amount of reinforcement on the wear rate of composites were designed in accordance with the Taguchi model. The results revealed that both load and sliding velocity have the highest influence.
Journal of Alloys and Compounds, 2015
Present study outlines the effect of ZrB 2 particles variation on the morphology and mechanical properties of (ZrB 2 þAl 3 Zr)/AA5052Al alloy composites. Composites with varying amount of ZrB 2 particles have been produced by direct melt reaction (DMR) technique. These composites have been characterized by X-ray diffractometer (XRD) and energy-dispersive spectroscopy (EDS) to confirm the presence of ZrB 2 and Al 3 Zr particles. Optical microscopy (OM) and scanning-electron microscopy (SEM) have been used to understand the morphology. To see the effect of ZrB 2 variation on mechanical properties, hardness and tensile properties have been evaluated. The XRD and EDS results confirm the successful formation of ZrB 2 particles in matrix of AA5052Al alloy. SEM and TEM studies exhibit that ZrB 2 particles are mostly in hexagonal and some rectangular shape while Al 3 Zr particles are in polyhedron and rectangular shapes. Most of ZrB 2 particles are within a size range of 10e190 nm. Interface region is free of any impurity. OM studies show grain refinement of AA5052Al alloy matrix with formation of second phase ZrB 2 particles. Tensile results indicate that the UTS and YS improve up to 3 vol.% of ZrB 2 but beyond this composition a decreasing trend is observed. The strength coefficient increases with increase in ZrB 2 particles up to 3 vol.% in the Al 3 Zr/Al alloy composites, whereas strain hardening decreases. While beyond 3 vol.% ZrB 2 particles in the Al 3 Zr/Al alloy composite, opposite trend is observed in strength coefficient and strain hardening. Percentage elongation also improves with 1vol.% ZrB 2 , but further addition of ZrB 2 shows an adverse effect. However, a continuous increasing trend has been observed in bulk hardness. Fracture studies show facets of Al 3 Zr particles and dimples of matrix, but with inclusion of ZrB 2 dimple size decreases. Increase in ZrB 2 leads to quasi cleavage fracture and debonding of ZrB 2 clusters.
SAE Technical Paper series, 2019
The Cardinal goal of this research work is to fabricate hybrid composites of AA8011 with reinforcement particles of Zr 2 O 3 and Al 2 O 3 which was taken in equal (5wt%) weight percentage. The hybrid composites were cast in a square shape (50x50x50 mm size) under the optimal stir casted process parametric condition, further, it was taken for the forging process. The prepared specimens were induced for uni-direction (x), bi-direction (x and y) and multi-direction (x,y, and z) forging route and the response of microhardness of 53, 68, 81 and 96 VHN were obtained respectively due to microstructural phase changes with an even distribution of particles in the matrix. Thus, the tribological properties of prepared specimens were tested using pin-on-disc Tribometer at room temperature under dry sliding condition of load 5,10,15,20 N and by adjusting the sliding speed as 266 and 531 rpm respectively. The outcomes uncovered all the specimens that the wear rate increments with an increase in load and coefficient of friction show an increase at most extreme load conditions. Wear rate increments with increment in the sliding distance and Coefficient of friction also increment in sliding speed. As a result, it was concluded that multi-directional forged hybrid metal matrix composite was far better than uni and bi-directional forging specimens. The prepared specimen was prescribed for high precision parts inferable from its better tribological executions.
Dry sliding wear response of ZrB2-20vol.% MoSi2 composite
Materials Today: Proceedings, 2018
Abrasive wear behavior of ZrB 2-20 vol.% MoSi 2 composite has been studied using electroplated diamond disk as the counter facing body. The investigated composite has been prepared by hot pressing and it has been found to possess 97% of the theoretical density. The microstructure of the composite has been characterized using scanning electron microscopy (SEM), and results show that MoSi 2 particles are uniformly distributed in the ZrB 2 matrix. The Young's modulus, Poisson's ratio and fracture toughness of the investigated composite are 455 GPa, 0.11 and 4.7MPa√m, respectively. The effect of experimental conditions including applied load, sliding velocity and sliding distance on the tribological behavior of ZrB 2-20 vol.% MoSi 2 composite have been investigated. Experimental results show that applied load and sliding velocity plays an important role on specific wear rate and surface roughness of worn surfaces. SEM is used to analyze the wear surface morphology and crack propagation to study the wear mechanism. The dominant mode of wear was identified as abrasion. Grain pullout and micro cracking control the prevailing wear mechanism.
IOP Conference Series: Materials Science and Engineering, 2020
Aluminium alloy is the most favourable material for industrial usage because of outstanding low density, specific strength and resistance to oxidation. In this study, zirconium diboride (5 wt. % ZrB2) as hard ceramic particles and solid lubricants as hexagonal boron nitride (2.5 wt. % hBN) and tungsten disulfide (2.5 wt. % WS2) particles were used for fabrication of AA 7075 hybrid composite. The fabrication of hybrid composites is done through liquid metallurgy technique. The uniform distribution particles on matrix material were analysed through Optical Microscope (OM) and X-Ray Diffraction (XRD) was used to identify the phase of alloy and hybrid composite materials. The Micro Vickers hardness and tensile strength were used to evaluate the mechanical strength of alloy and composites. The microstructure of composites reveals fairly distributed ceramic and solid lubricant particles over the base matrix. The XRD peaks reveals presence of AA7075, ZrB2, hBN and WS2 with low intensity pe...
Advances in Materials Science and Engineering
ZrB2 particle-reinforced AA7475 is a potential material for high-performance aeronautical engine blades because of its exceptional characteristics. The machinability of ZrB2/AA7475 metal matrix composites (MMC) is still a challenge because of the influence of ZrB2 particles. The impact of ZrB2 particulates on the machined parameters of ZrB2/aluminum matrix composites was explored experimentally in order to meet the needs of industry. Additionally, the best machining circumstances for this type of material matrix composites were studied in this research. A surface roughness (Ra) and metal removal rate (MRR) multiobjective optimization model was built, and a set of ideal parameter combinations was produced, with the surface roughness of ZrB2/AA7475 material matrix composites being lower than that of the nonreinforced alloys at the same cutting speed.
Materials Today: Proceedings, 2017
The present work focused on comparative study on the mechanical and thermal properties of Al alloy (A380)-5wt.%TiB 2 and Al alloy (A380)-5wt.%ZrB 2 particulate composites which were processed through in-situ reaction. The TiB 2 and ZrB 2 particle reinforced composites were produced through the salt-melt reaction of K 2 TiF 6 +KBF 4 and K 2 ZrF 6 +KBF 4, respectively, in the presence of aluminium melt. The formation of TiB 2 and ZrB 2 particles were confirmed by the XRD analysis. Between the two composites, the TiB 2 /A380 composite was found to have better tensile strength and hardness while the ZrB 2 /A380 composite displayed higher coefficient of thermal expansion (CTE). The properties were also compared with the parent aluminium and it is found that both composites have higher hardness but smaller tensile strength and CTE than the aluminium.
Tribological Behavior of AA7075 Reinforced with Ag and ZrO2 Composites
Advances in Materials Science and Engineering
In this study, an AA7075 composite material with a varying weight percentage of silver and zirconium oxide reinforcement is examined in terms of its properties. Reinforcement quantities ranging from 0, 4, 8, 12, and 16 wt % were combined with the matrix using the in-situ technique of stir casting in the field. Tensile, mechanical hardness, and compressive strength were assessed in accordance with the standard. The X-ray diffraction and EDS were utilized to analyze AA7075 composites for the distribution and dispersion of particles. Different input parameters such as load (N), composites (wt %), and velocity (m/s) were used to evaluate wear resistance when using the pin-on-disc method. The wear rate (mm/m) was estimated for every weight percent of reinforced mass loss (g). Optimization methods such as Taguchi and analysis of variance were used to determine the AA7075’s optimal processing parameters and composites that were the most significant. In order to identify the best genetic al...