放电等离子烧结WMoNbTaV-Al_(2)O_(3)高熵合金组织及磨损性能  

Microstructure and Wear Properties of WMoNbTaV-Al_(2)O_(3) High Entropy Alloy Prepared by Spark Plasma Sintering

作　　者：刘美君 徐流杰[1,2] 李洲[1] 郭明宜 胡继康 申华海 Liu Meijun;Xu Liujie;Li Zhou;Guo Mingyi;Hu Jikang;Shen Huahai(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471000,China;Henan International Joint Laboratory for High Temperature Refractory Metal Materials,Henan University of Science and Technology,Luoyang 471000,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471000 [2]河南科技大学河南省高温难熔金属材料国际联合实验室,河南洛阳471000 [3]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《稀有金属材料与工程》2024年第5期1236-1244,共9页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(U2004180);National Key R&D Program of China(2020YFB2008400)。

摘　　要：以金属粉末为原料,采用放电等离子烧结技术制备新型含α-Al_(2)O_(3)的WMoNbTaV难熔高熵合金,研究了烧结温度对合金致密化行为、相结构、显微组织和耐磨性能的影响。结果表明:在1800~1900℃烧结时,WMoNbTaV-Al_(2)O_(3)高熵合金基体具有单一bcc相结构,Al_(2)O_(3)的平均晶粒尺寸为1.15μm。随着烧结温度升高,合金的晶粒尺寸增大,致密度和显微硬度也在不断增高,在1900℃烧结时硬度达到7967.4 MPa。1900℃烧结得到的合金具有优异的耐磨性,磨损量仅为1800℃烧结合金的一半。且WMoNbTaV-Al_(2)O_(3)高熵合金的耐磨性远高于纯W材料。当磨料粒度为37.5μm时,1900℃烧结的合金磨损量为0.9 mg,磨损性能是纯W材料的83倍。A new refractory high entropy alloy WMoNbTaV containing Al_(2)O_(3) was prepared by spark plasma sintering.The effects of sintering temperature on densification behavior,phase structure,microstructure and wear resistance of the alloy were studied.The results show that when sintered at 1800‒1900°C,the matrix of WMoNbTaV-Al_(2)O_(3) has a single bcc phase structure,and the average grain size of Al_(2)O_(3) is 1.15μm.With the increase in sintering temperature,the grain size of the alloy increases,the density and microhardness also increase,and the hardness reaches 7967.4 MPa when the sintering temperature is 1900°C.The alloy sintered at 1900°C has excellent wear resistance,and the wear amount is only half of that of the alloy sintered at 1800°C.The wear resistance of WMoNbTaV-Al_(2)O_(3) high entropy alloy is much higher than that of pure W material.When the abrasive particle size is 37.5μm,the wear mass loss of alloy sintered at 1900°C is 0.9 mg,and the wear resistance of alloy is 83 times higher than that of pure W material.

关 键 词：放电等离子烧结 难熔高熵合金 显微组织 磨损性能 

分 类 号：TG139[一般工业技术—材料科学与工程]