强磁场对CrCoNi中熵合金过冷凝固组织与性能的影响  

Effect of High Magnetic Field on the Solidification Microstructure and Properties of Undercooled CrCoNi Medium-entropy Alloy

作　　者：刘昱东 魏晨 闫育洁 王军[1] LIU Yudong;WEI Chen;YAN Yujie;WANG Jun(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《铸造技术》2022年第5期346-350,共5页Foundry Technology

基　　金：国家自然科学基金资助项目(52174275);陕西省创新能力支撑计划(2020KJXX-073);凝固技术国家重点实验室自主课题(2021-TS-01)。

摘　　要：研究了强磁场下Cr CoNi中熵合金不同过冷度下凝固组织和性能的作用机制。结果表明,无磁场时,随着过冷度从98 K提高到386 K,合金的平均晶粒尺寸从50.1μm减小至10.1μm,合金的抗压屈服强度也从162 MPa增加到262 MPa。施加10 T磁场后,晶粒尺寸明显减小,76 K过冷度和387 K过冷度下合金的平均晶粒尺寸分别为32.8μm和9.7μm,合金的抗压屈服强度分别为180 MPa和264 MPa。对比发现,随着过冷度增大,磁场对组织和性能的影响逐渐减弱。The mechanism of solidification microstructure and properties of Cr CoNi medium-entropy alloy at different supercooling degree under high magnetic field was studied.The results show that the average grain size of the alloy decreases from 50.1μm to 10.1μm and the compressive yield strength of the alloy increases from 162 MPa to 262 MPa with the increase of the supercooling degree from 98 K to 386 K without magnetic field.The average grain size of the alloy is 32.8μm and 9.7μm at 76 K and 387 K undercooling,and the yield strength of the alloy is 180 MPa and264 MPa,respectively,due to the inhibition effect of thermoelectric magnetic force on grain growth.It was found that the effect of magnetic field on microstructure and properties gradually weakened with the increase of subcooling degree.

关 键 词：强磁场 中熵合金 过冷 凝固 

分 类 号：TG146[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]