WC-10CoCrFeMnNi高熵硬质合金微观组织及力学性能研究  

Study on Microstructure and Mechanical Properties of WC-10CoCrFeMnNi High-Entropy Cemented Carbide

作　　者：汪克威 董勇 赵朕东 曾卓见 胡永俊[1] 章争荣[1] WANG Ke-wei;DONG Yong;ZHAO Zhen-dong;ZENG Zhuo-jian;HU Yong-jun;ZHANG Zheng-rong(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;National Engineering Laboratory for Modern Materials Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]广东省科学院新材料研究所现代材料表面工程技术国家工程实验室,广东广州510650

出　　处：《稀有金属与硬质合金》2024年第2期89-94,109,共7页Rare Metals and Cemented Carbides

摘　　要：利用机械合金化技术制备了等物质的量之比的CoCrFeMnNi高熵合金粉末,采用放电等离子烧结技术制备了WC-10CoCrFeMnNi硬质合金。通过X射线衍射仪、扫描电子显微镜、能谱仪、维氏硬度计和激光粒度分析仪等对高熵合金粉末和硬质合金进行微观组织与性能研究。结果表明,经80 h球磨获得纳米晶CoCrFeMnNi高熵合金粉末,其结构以BCC为主相、FCC为次相,平均粒径为1.4μm,且粒度分布较为集中。使用CoCrFeMnNi高熵合金为黏结相的硬质合金展现出了良好的力学性能,在1 250℃烧结的硬质合金拥有较好的综合力学性能,维氏硬度达到(1 452±18.95)HV_(30),断裂韧性达到(8.57±0.32)MPa·m^(1/2)。CoCrFeMnNi high-entropy alloy powder with equal molar ratio was prepared by mechanical alloying,and WC-10CoCrFeMnNi cemented carbide was prepared by spark plasma sintering.The microstructure and properties of high-entropy alloy powder and cemented carbide were studied by X-ray diffractometer,scanning electron microscope,energy dispersive spectrometer,Vickers hardness tester,and laser particle size analyzer.The results show that the nanocrystalline CoCrFeMnNi high-entropy alloy powder,with BCC as the main phase and FCC as the secondary phase,can be obtained by 80 h of ball milling.The ave-rage particle size is 1.4μm,and the particle size distribution is relatively centralized.The cemented carbide,using CoCrFeMnNi high-entropy alloy as the binder phase,exhibits excellent mechanical properties.And the cemented carbide sintered at 1250℃has better comprehensive mechanical properties,with a Vickers hardness of(1452±18.95)HV_(30)and a fracture toughness of(8.57±0.32)MPa·m^(1/2).

关 键 词：硬质合金 高熵合金 机械合金化 放电等离子烧结 力学性能 

分 类 号：TG146.41[一般工业技术—材料科学与工程]