Effect of Mn content on microstructure and properties of AlCrCuFeMnx high-entropy alloy

作     者：Ning Wang Kai Ma Qiu-da Li Yu-dong Yuan Yan-chun Zhao Li Feng Ning Wang;Kai Ma;Qiu-da Li;Yu-dong Yuan;Yan-chun Zhao;Li Feng

作者机构：School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Reuse of Nonferrous MetalsLanzhou 730050China CNNC Nuclear Power Operation and Management Co.Ltd.Haiyan 314300ZhejiangChina 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2024年第21卷第2期

页      面：147-158页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the China Postdoctoral Science Foundation Project(2018M633650XB) Gansu Province Young Doctoral Fund Project(2021QB-043) the CNNC Operations Management Limited R&D Project(QS4FY-22003224)。 

主　　题：high-entropy alloys microstructure mechanical properties wear resistance strengthening mechanisms 

摘      要：AlCrCuFeMnx(x=0,0.5,1,1.5,and 2)high-entropy alloys were prepared using the vacuum arc melting technology.The microstructure and mechanical properties of AlCrCuFeMnxwere analyzed and tested by XRD,SEM,TEM,nanoindentation,and electronic universal testing.The results indicate that the AlCrCuFeMnxhigh-entropy alloy exhibits a dendritic structure,consisting of dendrites with a BCC structure,interdendrite regions with an FCC structure,and precipitates with an ordered BCC structure that form within the dendrite.Manganese(Mn)has a strong affinity for dendritic,interdendritic,and precipitate structures,allowing it to easily enter these areas.With an increase in Mn content,the size of the precipitated nanoparticles in the dendritic region initially increases and then decreases.Similarly,the area fraction initially decreases and then increases.Additionally,the alloy’s strength and wear resistance decrease,while its plasticity increases.The Al Cr Cu Fe Mn1.5alloy boasts excellent mechanical properties,including a hardness of 360 HV and a wear rate of 2.4×10^(-5)mm^(3)·N^(-1)·mm^(-1).It also exhibits impressive yield strength,compressive strength,and deformation rates of 960 MPa,1,700 MPa,and 27.5%,respectively.