A Hf-doped dual-phase high-entropy alloy: phase evolution and wear features

作     者：Hao Ren Rui-Run Chen Xue-Feng Gao Tong Liu Gang Qin Yu-Lung Chiu Shi-Ping Wu Jing-Jie Guo Hao Ren;Rui-Run Chen;Xue-Feng Gao;Tong Liu;Gang Qin;Yu-Lung Chiu;Shi-Ping Wu;Jing-Jie Guo

作者机构：National Key Laboratory for Precision Hot Processing of MetalsSchool of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China School of Metallurgy and MaterialsUniversity of BirminghamEdgbastonBirmingham B152TTUK 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2024年第43卷第1期

页      面：324-333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 Natural Science Foundation of China (No.51825401) the Postdoctoral Foundation of Heilongjiang Province (No.LBHZ19154) the National Natural Science Foundation of Heilongjiang Province (No.LH2020E031) the Interdisciplinary Research Foundation of HIT 

主　　题：High entropy alloy Laves phase Hardness Wear mechanism 

摘      要：Initially defined high entropy alloys(HEAs)usually exhibit a single-phase solid-solution ***,two and/or more types of phases in HE As possibly induce the desired microstructure features,which contribute to improving the wear properties of HE ***,we prepare a series of(AlCoCrFeNi)_(100-x)Hf_(x)(x=0,2,4and 6;at%) HEAs and concern their phase compositions,micro structures and wear *** leads to the formation of(Ni,Co)_(2)Hf-type Laves phase and tailors the microstructure from a body-centered cubic(BCC) singlephase structure to a hypoeutectic *** increased hardness from~HV 512.3 to~HV 734.1 is due to solid-solution strengthening,grain refinement strengthening and precipitated phase *** a few oxides(Al_(2)O_(3)+Cr_(2)O_(3)) caused by the wear heating contribute to an 85.5% decrease in wear rate of the HEA system from6.71×10^(-5) to 0.97×10^(-5) m^(3)·N^(-1)·m^(-1).In addition,Hf addition changes the wear mechanism from abrasive wear,mild oxidative wear and adhesive wear to oxidative wear and adhesive wear.