High-Temperature Tensile and Tribological Behavior of Hybrid (ZrB 2 +Al 3 Zr)/AA5052 In Situ Composite
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ALUMINUM matrix composites (AMCs) reinforced with particulates are widely used in fabricating railway and automobiles parts such as cylinders, brake, discs/drums, piston insert rings, and pistons due to their superior mechanical properties as compared to the unreinforced alloys.[1,2] Mechanical and tribological properties of composites are affected by several factors which may include operating test conditions, environmental conditions, synthesis route, type of reinforcement, their shape and size, amount of reinforcement, and composition of the matrix. Several hybrid composites have already been explored for mechanical and tribological properties and results are reported under different conditions. Zhang et al.[3] fabricated the aluminum matrix composites reinforced with Al2O3 and Al3Zr particulates and observed improvement in the mechanical properties. In another
G. GAUTAM, Research Scholar, and A. MOHAN, Associate Professor, are with the Department of Physics, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh 221005, India. Contact email: [email protected] N. KUMAR, Assistant Professor, is with the Department of Mechanical Engineering, Bundelkhand Institute of Engineering and Technology (BIET), Jhansi, Uttar Pradesh 284128, India. R.K. GAUTAM, Associate Professor, is with the Department of Mechanical Engineering, Indian Institute of Technology (BHU). S. MOHAN, Professor, is with the Department of Metallurgical Engineering, Indian Institute of Technology (BHU). Manuscript submitted October 6, 2015. METALLURGICAL AND MATERIALS TRANSACTIONS A
study, Gautam et al.[4] also observed improvement in mechanical properties on reinforcing ZrB2 and Al3Zr particles in AA5052 Al matrix. Wilson et al.[5] used different matrices A356 and 6061 Al alloys to prepare composites and studied their wear behavior. They observed that mild to severe wear transition in both the alloys takes place within a temperature range of 498 K to 503 K (225 °C to 230 °C) and 448 K to 463 K (175 °C to 190 °C), respectively. They further observed that 20 vol. pct Al2O3 in the 6061Al alloy increases the mild to severe wear transition temperature range to 583 K to 623 K (310 °C to 350 °C). And 20 vol. pct SiC in A356 Al alloy increases this range to 713 K to 723 K (440 °C to 450 °C) which is further extended to 733 K (460 °C) on addition of 10 vol. pct graphite. Ames et al.[6] identified mild to severe wear transition load for A356 aluminum alloy as 95 N which is increased to 225 N in its composite with 20 vol. pct SiC. Jianxin et al.[7] fabricated Al2O3-TiB2/SiC composites and studied the wear and friction behavior in a temperature range of 298 K to 1073 K (25 °C to 800 °C). They observed that dominance of oxidative wear at high temperatures changes the wear rate, but coefficient of friction is not sensitive to the temperatures. Natarajan et al.[8] observed that with increase in test temperature, wear rate of Al6063/TiB2 in situ composites increases slowly up to 373 K (100 °C) but beyond this temperature sharp increase in wear rate is
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