Abstract
In this study, AZ91 magnesium-alloy-based metal matrix composites (MMCs) reinforced with 10 wt% of Al0.5CoCrFeNi2 high-entropy alloy (HEA) particles and SiC particles were prepared by a spark plasma sintering (SPS) process at 300 °C. The effects of reinforcements on the microstructure and mechanical properties of AZ91-based MMCs were studied. The results showed that AZ91–HEA composite consisted of α-Mg, Mg17Al12 and FCC phases. No interfacial reaction layer was observed between HEA particles and the Mg matrix. After adding HEA into AZ91, the compressive yield strength (C.Y.S) of the AZ91–HEA composite increased by 17% without degradation of failure strain. In addition, the increment in C.Y.S brought by HEA was comparable to that contributed by commonly used SiC reinforcement (15%). A relatively low porosity in the composite and enhanced interfacial bonding between the α-Mg matrix and HEA particles make HEA a potential reinforcement material in MMCs.
Highlights
The goal for energy saving through improving fuel efficiency has driven the need for lightweight materials
Diffraction peaks at 43.5, 51.2 and 75.0◦ were observed in the X-ray diffraction (XRD) pattern of high-entropy alloy (HEA) powder, indicating that HEA has an FCC structure
Particles were fabricated by spark plasma sintering process
Summary
The goal for energy saving through improving fuel efficiency has driven the need for lightweight materials. Magnesium alloy is one of the most important lightweight materials in the automotive, aerospace and biomaterial industries and has attracted much attention because of its high specific strength to weight ratio and recyclability [1,2,3,4]. Research into high-performance Mg alloys that will satisfy the extended industrial applications is essential. One way to strengthen Mg alloys is by adding reinforcement phase into Mg matrix and making Mg alloy-based composites. Ceramic hard particles, such as Al2 O3 , ZnO, SiC, TiC and Y2 O3 , have been widely studied for application in Mg-based composites
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