高熵硬质合金WC-AlCo_(0.4)CrFeNi_(2.7)的制备及表征  

Preparation and Characterization of High-entropy Cemented Carbide WC-AlCo_(0.4)CrFeNi_(2.7)

作　　者：张明晨 郭瑞鹏 张勇[1,3,4] ZHANG Mingchen;GUO Ruipeng;ZHANG Yong(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science,University of Science and Technology Beijing,Beijing 100083,China;Shunde Graduate School of University of Science and Technology Beijing,Foshan 528399,Guangdong,China)

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]太原理工大学材料科学与工程学院,太原030024 [3]北京科技大学磁光电复合与界面科学北京市重点实验室,北京100083 [4]北京科技大学顺德研究生院,广东佛山528399

出　　处：《材料导报》2024年第4期164-169,共6页Materials Reports

基　　金：粤佛联合基金重点项目(2019B1515120020);中国创新群体基金(51921001)。

摘　　要：以气雾化法制备的AlCo_(0.4)CrFeNi_(2.7)高熵合金粉末和碳化钨(WC)分别作为粘结相和硬质相,采用放电等离子烧结制备高熵硬质合金,研究了粘结相含量和烧结温度对硬质合金的微观结构和力学性能的影响。结果表明,粘结相占比为10%(质量分数)经1300℃烧结的高熵硬质合金具有最佳力学性能,硬度和断裂韧性分别为1575HV_(30)、9.2 MPa·m^(1/2)。相对于粘结相含量对合金性能的影响,烧结温度的影响效果更显著;两者分别通过影响WC晶粒大小、相对密度以及有害的脆性金属间化合物的生成来影响高熵硬质合金的力学性能。AlCo_(0.4)CrFeNi_(2.7)high entropy alloy(HEA)powder prepared by gas atomization and tungsten carbide(WC)was used as binder phase and hard phase,respectively,and high-entropy cemented carbide was prepared by spark plasma sintering.The effects of binder phase content and sintering temperature on the microstructure and mechanical properties of cemented carbide were studied.The results show that the high-entropy cemented carbide with a binder phase ratio of 10wt%and sintered at 1300℃has the best mechanical properties,the hardness and fracture toughness are 1575HV_(30)and 9.2 MPa·m^(1/2),respectively.Compare to the influence of the binder phase content on performance,the effect of sintering temperature on performance is more significant.They affect the mechanical properties of high-entropy cemented carbide by influencing the grain size,relative density and production of harmful brittle intermetallic compounds of tungsten carbide,respectively.

关 键 词：高熵合金 硬质合金 粘结相 

分 类 号：TG135.3[一般工业技术—材料科学与工程]