Fabrication of Metal Matrix Composites via High-Speed Particle Implantation
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Fabrication of Metal Matrix Composites via High-Speed Particle Implantation Ju Zhou1 • Chang-Jiu Li1 • Cheng-Xin Li1
Submitted: 20 April 2020 / in revised form: 6 September 2020 / Accepted: 29 September 2020 Ó ASM International 2020
Abstract This study deals with the improvement of the wear resistance of aluminum alloys by metal matrix composites (MMCs). The latter were fabricated by implanting high-speed solid particles into the metal surfaces. For that, stainless steel and Fe-based amorphous alloy particles were accelerated to the substrates using high-pressure nitrogen. The effect of multi-particle implantation, particle material properties and kinetic energy at impact, and pre-heating treatment of the substrate on particle implantation was investigated using numerical simulation. In addition, the effect of particle size on the MMCs microstructure, wear resistance, strengthening mechanism, and relative hardness was studied. The results showed that the method simultaneously achieved shot peening and metal matrix composite strengthening, that is, resulted in a double-strengthening effect. Furthermore, high-speed particle implantation effectively improved the wear resistance of the substrate: The wear volume of Fe-based amorphous alloy/Al MMCs was 5% of the untreated aluminum substrate and that of stainless steel/Al MMCs 14–44%. It is believed that laserassisted particle implantation can be used to efficiently increase the thickness and surface properties of MMCs. Keywords aluminum alloys double-strengthening effect high-speed particle implantation laser-assisted particle implantation metal matrix composites (MMCs)
& Cheng-Xin Li [email protected] 1
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
Introduction Aluminum and its alloys have excellent physical properties, such as low specific gravity, high specific strength, good cutting, hot workability, non-magnetic and electromagnetic shielding properties, no adverse effects on the environment, and high recovery rates. In addition, aluminum is chemically active due to its small electrode potential and oxidation reactions occur easily, forming an aluminum oxide film that provides aluminum with good corrosion resistance. Hence, aluminum and its alloys are widely used in aviation, aerospace, marine, construction, automotive, energy chemical, packaging, electronic, weapons, and other fields (Ref 1–4). However, the poor wear resistance and high friction coefficient of aluminum alloys completely limit their application. In practical engineering applications, many types of mechanical parts fail before reaching their designed service life owing to fatigue, friction, wear, and other problems. Through investigation, it was found that the failure of a large number of metal structural parts occurred mostly at their surface (Ref 5, 6). Therefore, the use of numerous surface treatment technologies to improve the frict
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