Wear Behavior at High Temperature of Dual-Particle Size Zircon-Sand-Reinforced Aluminum Alloy Composite
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THE high-temperature wear-resistant material for high-performance tribological applications is one of the major requirements of industry. The lightweight ceramic-reinforced aluminum alloys are a major class of composites that are being worked out to serve the preceding purpose. Various categories of ceramic particles are currently used as abrasives, and their performance varies per the morphological features. Theoretical approaches and experimental evidence of the relationships between the particle morphology, wear rate, hardness, and fracture toughness have been well studied and reported in the literature.[1–7] The abrasive wear resistance of Al-Si alloys is strongly dependent on the type of reinforcement and its composition, applied load, and sliding speed.[8,9] Among the variety of processing techniques available for particulate- or discontinuous-reinforced metal matrix composites, stir casting is one of the methods adopted for the production of large quantity composites. Stir casting is also attractive because of its simplicity and flexibility, and it is most economical in the fabrication of large size components.[10–14] In recent years, much research work has been reported on the production of Aluminum metal matrix composites (AMCs) by the stir casting technique, but very limited research work has been done on reinforcement of dual-size particles.[15–17] Moreover, to the best of our knowledge, no work is reported on hightemperature wear behavior of aluminum composites reinforced with dual-size zircon sand particles. Bindumadhavan etal.[15] studied the wear and mechanical properties of dual particle size (DPS) reinforced particulate metal matrix composites, and they found that for the same total volume fraction of SiC SURESH KUMAR and RANVIR SINGH PANWAR, Ph.D. Scholars, and O.P. PANDEY, Senior Professor, are with the School of Physics and Materials Science, Thapar University, Patiala, Punjab, India 147004. Contact e-mail: [email protected] Manuscript submitted January 6, 2012. Article published online November 27, 2012 1548—VOLUME 44A, MARCH 2013
reinforcement, DPS composites containing both small (47 lm) and large (120 lm) SiC particles showed higher wear resistance than composites having only small size particles. The DPS composites were found to have higher impact energy than SPS composites containing only small (47 lm) SiC-reinforced particles. Martin etal.[18] reported the lower wear resistance of Al-Si alloy than Al-Si alloy reinforced with large Si or SiC particulates in the temperature range of 293 K to 473 K (20 °C to 200 °C). The oxidation of metallic materials and the role of oxide scale in establishing the wear mechanism are also reported.[7,19] The tensile properties of aluminum casting alloys are strongly dependent on secondary dendrite arm spacing, porosity level, and the modifications that occur during heat treatment of the alloys.[20–22] The mechanical properties were minimally affected by temperatures below 473 K (200 °C).[23] During high-temperature tensile tests, the voids were form
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