Dry sliding wear of a Ti 50 Ni 25 Cu 25 particulate-reinforced aluminum matrix composite
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INTRODUCTION
A considerable number of investigations have been carried out in the field of metal matrix composites, stimulated by the need for higher performance structural materials. Particulate-reinforced aluminum alloy composites emerged from this perpetual need due to their significant properties of high specific strength and modulus, high stiffness and light weight, and excellent wear resistance compared to conventional alloys.[1,2,3] They are fast becoming a favorite choice in many applications, such as bearing sleeves, piston, gears, valves, cylinder liners, etc.[4,5,6] In many of these applications, excellent friction and wear performances are required. A number of studies have been reported on the wear behavior of particle-reinforced aluminum matrix composites during the last 20 years,[7–22] including aluminum or aluminum alloys reinforced by SiC, Al2O3, TiC, Si3N4, TiB2, B4C, graphite particles, etc. Among them, SiC and Al2O3 were often chosen because of significant wear resistance with the addition of these two particles. Similar results were reached by various reinforcements, that the composites have higher wear resistance than their unreinforced matrices except under certain conditions. Some uncommon and often contradictory results have also been obtained, as reviewed and discussed by Sannino and Rack.[21] Shape memory alloys are famous for their shape memory effects, pseudoelasticity, and other significant properties. Motivated by the design concept of enhancing the mechanical properties of TiNi shape memory alloy fiber-reinforced G. WANG, formerly Graduate Student, Department of Materials Engineering, Dalian University of Technology, is Ph.D Candidate, Engineering Materials Program, Department of Mechanical and Materials Engineering, University of Windsor, Windsor, ON, Canada N9B 2L4. P. SHI, Doctoral Candidate, M. QI, Associate Professor, and F.X. CHEN and D.Z. YANG, Professors, are with the Department of Materials Engineering, Dalian University of Technology, Dalian 116024, People’s Republic of China. J.J. XU, Postdoctoral Researcher, is with the Institute of Metal Technology, Dalian Maritime University, Dalian 116024, People’s Republic of China. Manuscript submitted April 1, 1997. METALLURGICAL AND MATERIALS TRANSACTIONS A
aluminum matrix composite proposed by Furuga et al.[24] Yamada et al.[25] presented the design concept of TiNi particle-reinforced aluminum matrix composites. An analytical model on the basis of Eshlby’s equivalent inclusion method for the prediction of the Young’s modulus, yield stress, and work-hardening rate of this material was developed by them. But this is only a theoretical analysis without experimental verification, and few studies have been reported about this kind of material. In this article, a Ti50Ni25Cu25 shape memory alloy particulate-reinforced aluminum matrix composite was fabricated. Ti50Ni25Cu25 particles were chosen because of their high damping capacity[26] and, thus, will contribute to the composite’s damping capacity. Because the aging characteristics
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