CoCrFeNiW_(x)高熵合金黏结剂对WC硬质合金显微组织和力学性能的影响  

Effect of CoCrFeNiW_(x) High Entropy Alloy Binder on Microstructure and Mechanical Properties of WC Cemented Carbide

作　　者：虞一凡 田君 刘涛[2,3] 蔡晓康 刘超 戴品强 YU Yifan;TIAN Jun;LIU Tao;CAI Xiaokang;LIU Chao;DAI Pinqiang(College of Materials Science and Engineering,Fujian University of Technology,Fuzhou 350118,China;Fujian Key Laboratory of Advanced Materials Preparation and Forming Technology,Fujian University of Technology,Fuzhou 350118,China;School of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China;Xiamen Tungsten Industry Co.,Ltd.,Xiamen 361013,China)

机构地区：[1]福建工程学院材料科学与工程学院,福州350118 [2]福建工程学院福建省新材料制备及成形技术重点实验室,福州350118 [3]福州大学材料科学与工程学院,福州350108 [4]厦门钨业有限公司,厦门361013

出　　处：《机械工程材料》2023年第2期14-20,25,共8页Materials For Mechanical Engineering

基　　金：福建省高校产学合作项目(2019H6022)。

摘　　要：采用机械合金化方法制备CoCrFeNiW_(x)(x取0.2,0.5,物质的量分数/%)高熵合金粉末,作为黏结剂(添加质量分数分别为6%,10%,14%)与WC粉混合,经放电等离子烧结得到WC硬质合金,研究了高熵合金黏结剂对硬质合金显微组织和力学性能的影响。结果表明:CoCrFeNiW_(x)高熵合金黏结剂具有面心立方和体心立方双相结构,可细化WC硬质合金晶粒;随着高熵合金黏结剂含量的增加,WC硬质合金的维氏硬度降低,断裂韧度和抗弯强度总体呈上升趋势。添加质量分数10%CoCrFeNiW_(0.2)高熵合金黏结剂制备的WC硬质合金综合性能最佳,维氏硬度为1785 HV,断裂韧度为10.6 MPa·m^(1/2),抗弯强度为1373 MPa。CoCrFeNiW_(x)(x=0.2,0.5,mole fraction/%)high entropy alloy powder was prepared by mechanical alloying method.The powder was mixed with WC powder as a binder(adding mass fraction was 6%,10%,14%,respectively),and then WC cemented carbides were obtained by spark plasma sintering.The effect of the high entropy alloy binder on the microstructure and mechanical properties of the cemented carbide was studied.The results show that the CoCrFeNiW_(x) high entropy alloy binder had a face-centered cubic and body-centered cubic dual-phase structure and could refine grains in WC cemented carbides.With the increase of high entropy alloy binder content,the Vickers hardness of the WC cemented carbide decreased,and the fracture toughness and bending strength had a general increase trend.The WC cemented carbide prepared by adding 10wt%CoCrFeNiW_(0.2) high entropy alloy binder had the best comprehensive performance,with Vickers hardness of 1785 HV,fracture toughness of 10.6 MPa·m^(1/2),and bending strength of 1373 MPa.

关 键 词：机械合金化 高熵合金 WC硬质合金 放电等离子烧结 

分 类 号：TG135.5[一般工业技术—材料科学与工程]