真空热压时间和压力对CoCrCuFeNi高熵合金组织与力学性能的影响  

Effects of vacuum hot-pressing time and pressure on the microstructure and mechanical properties of CoCrCuFeNi high-entropy alloy

作　　者：赵振国 朱和国[1] ZHAO Zhenguo;ZHU Heguo(College of Material Science and Engineering,Nanjing University of Science and Technolegy,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,南京210094

出　　处：《粉末冶金材料科学与工程》2022年第2期180-186,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51571118)。

摘　　要：采真空热压法在900℃下制备CoCrCuFeNi高熵合金,研究热压时间和压力对合金微观组织及力学性能的影响。结果表明:烧结压力为10 MPa时,所有CoCrCuFeNi高熵合金均含双FCC相和少量富Cr相。随热压时间延长,富Cr相的尺寸增大,合金的抗压强度和硬度先升高后降低。热压时间为1.5 h时,随热压压力从10 MPa升高至30 MPa,合金中富Cu的FCC相与贫Cu相分离现象消失。随热压压力增大,高熵合金的抗压强度先升高后降低,但硬度无明显变化。当热压时间为1.5 h、压力为20 MPa时,合金的抗压强度最高,达到1229 MPa,硬度(HV)为3136 MPa。The CoCrCuFeNi high-entropy alloy was prepared by vacuum hot-press sintering.The effects of hot-pressing time and pressure on the microstructure and mechanical properties of the CoCrCuFeNi high-entropy alloy were studied.The results show that when the pressure is 10 MPa,all high-entropy alloys contain dual FCC phases and a small amount of Cr-rich phase.With the increase of hot-pressing time,the size of the Cr-rich phase increases and the compressive strength and hardness of the high-entropy alloy first increase and then decrease.When the hot-pressing time is 1.5 h,and the pressure increases from 10 MPa to 30 MPa,the separation phenomenon of Cu-rich FCC phase and Cu-poor phase disappears in the alloy.With the increase of hot-pressing pressure,the compressive strength of the high-entropy alloy first increases and then decreases,but there is no significant change in hardness.When the hot-pressing time is 1.5 h and the pressure is 20 MPa,The alloy has the highest compressive strength of 1229 MPa and a hardness(HV)of 3136 MPa.

关 键 词：真空热压 高熵合金 微观组织 抗压强度 维氏硬度(HV) 

分 类 号：TG113[金属学及工艺—物理冶金]