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
汪克威 1董勇 1赵朕东 1曾卓见 2胡永俊 1章争荣1
作者信息
- 1. 广东工业大学材料与能源学院,广东广州 510006
- 2. 广东工业大学材料与能源学院,广东广州 510006;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
- 折叠
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-l0CoCrFeMnNi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1.4pm,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)HV30,断裂韧性达到(8.57土0.32)MPa·m1/2.
Abstract
CoCrFeMnNi high-entropy alloy powder with equal molar ratio was prepared by mechanical allo-ying,and WC-10CoCrFeMnNi cemented carbide was prepared by spark plasma sintering.The microstruc-ture and properties of high-entropy alloy powder and cemented carbide were studied by X-ray diffractome-ter,scanning electron microscope,energy dispersive spectrometer,Vickers hardness tester,and laser parti-cle 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 1.4 μm,and the particle size distribution is relatively centralized.The cemented car-bide,using CoCrFeMnNi high-entropy alloy as the binder phase,exhibits excellent mechanical properties.And the cemented carbide sintered at 1 250 ℃ has better comprehensive mechanical properties,with a Vickers hardness of(1 452±18.95)HV30 and a fracture toughness of(8.57±0.32)MPa·m1/2.
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Key words
cemented carbide/high-entropy alloy/mechanical alloying/spark plasma sintering/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据