Effect of Al on microstructure and mechanical properties of cast CrCoNi medium-entropy alloy
Effect of Al on microstructure and mechanical properties of cast CrCoNi medium-entropy alloy作者机构：State Key Laboratory of Materials Processing and Die and Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China Department of Mechanical EngineeringWuhan University of Science and TechnologyWuhan 430081China School of Materials Science and EngineeringXi'an University of technologyXi’an 710048China
出 版 物：《China Foundry》 (中国铸造（英文版）)
年 卷 期：2018年第15卷第4期
页 面：253-262页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：financially supported by the National Nature Science Foundation of China(51775204 and 51604222) the Analytical and Testing Center,HUST China Postdoctoral Science Foundation Funded Project
主 题：medium-entropy alloy microstructure mechanical properties Al addition
摘 要：Cast CrCoNiAIx （x=0-1.2） medium-entropy alloys （MEAs） were produced by arc melting and flip cast to investigate the alloying effect of AI addition on the microstructure, phase constituent and mechanical properties. The crystal structure changes from an initial face-centered cubic （FCC） to duplex FCC and body-centered cubic （BCC） and finally a single BCC with increasing AI content. In the duplex region, FCC and BCC phases form under a eutectic reaction in the interdendrite region. In the single BCC region, the dendrites transform to ordered B2 and disordered A2 BCC phases resulting from spinodal decomposition. Corresponding to their phase constituents, yield strength increases accompanied with an elongation reduction with increasing AI addition. A very interesting phenomenon of very weak ordered FCC （001） spots appearing in AI-0.4 alloy was observed, indicating a local ordering of FCC phase. The changes of fracture surfaces after the tensile deformation are also corresponding to the variations in mechanical properties.
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