Abstract
In order to study the effects of different sintering processes on the properties of the alloy, including the microstructure, hardness, friction and wear properties of the alloy, the optimum sintering method and process parameters were selected. A series of FeAlCoCrNiTi0.5 high-entropy alloy blocks were prepared by mechanical alloying using inert alloy sintering technology. XRD pattern showed that when the sintering temperature was 1000°C and the holding time was 3h, the phase structure would be a simple body-centered cubic BCC2 phase and a face-centered cubic FCC phase. SEM observation showed that the microstructure is denser, and the grain refinement of the high entropy alloy is remarkably better. The evaluation of hardness, friction and wear properties showed that the high-entropy alloy had the best overall performance.
Highlights
The high-entropy alloy (HEA) have broad prospects for industrial applications due to their properties such as high strength and toughness,[1] high hardness,[2,3] wear resistance,[4] and excellent resistance to temper softening.[5]
Some HEAs with excellent performance have been applied in production and life,[6] such as high-entropy alloy drill bits, high-entropy alloy micro-electromechanical elements, etc
It was found that the use of mechanical alloying and a reasonable sintering process can produce HEAs are of larger size, finer grain size, and better strength and hardness performance compared with the electric arc
Summary
Selecting a suitable post-treatment process has a great influence on the properties of HEAs. In recent years, many scholars have used vacuum hot pressing, plasma sintering and other methods to obtain high entropy alloys such as NiCrCoTiV, CoCrFeNiTi x, AlCoCrFeNi, etc.[19,20,21] scholars have adopted the traditional vacuum sintering process. The vacuum sintering equipment is low in cost, easy to operate and has a broad research prospect in the preparation of high-density block high entropy alloys. In this study, the method of vacuum sintering was adopted for the post-treatment of high-entropy alloy preparation. AlFeNiCoCr series high entropy alloys[15] have been widely studied. This study used mechanical alloying combined with vacuum sintering technology to prepare FeAlCoCrNiTi0.5 high entropy alloy, change its sintering process, study the mechanical properties and microstructure of the alloy. The influences of different sintering processes on the microstructure, hardness, friction and wear properties and the mechanism of action of the alloys are explored in order to provide the necessary data accumulation and technical support for the engineering application of these alloys
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