强磁场对过冷Cu-Co合金组织演化行为的影响  

Effect of High Magnetic Field on the Microstructure Evolution Behavior of Undercooled Cu-Co Alloy

作　　者：魏晨 李金山[1] 闫育洁 林凯茜 王军 WEI Chen;LI Jinshan;YAN Yujie;LIN Kaixi;WANG Jun(School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《铸造技术》2022年第3期180-186,共7页Foundry Technology

基　　金：国家自然科学基金(52174375和51690163);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：研究了强磁场对过冷Cu-50at.%Co合金微观组织演化行为的影响,结合相关理论分析阐述了强磁场的作用机制。结果表明,强磁场显著改变了合金的液相分离行为。由于静磁能的作用,导致核-壳结构发生了变化,平行磁场方向上,富Co相和二次相分离的富Cu相均沿磁场方向被拉长;随着磁场强度的增加,富Co相被拉长的程度愈发显著,并在垂直于磁场的方向上获得了富Co相在基体中分布相对均匀的微观结构。凝固后的Cu-Co合金,在10 T强磁场下达到饱和磁化强度的速度明显加快。此外,随着磁场强度以及过冷度的增加,合金的电阻率数值降低。The effect of high magnetic field on the microstructure evolution behavior of undercooled Cu-50at.%Co alloy was studied,and the mechanism of high magnetic field was discussed based on relevant theories.The results show that the high magnetic field significantly changes the liquid phase separation behavior of the alloy.The core-shell structure changes due to the action of magnetostatic energy.In the direction of parallel magnetic field,the Co-rich phase and the Cu-rich phase separated by secondary phase are elongated along the magnetic field direction.With the increase of magnetic field intensity,the co-rich phase is elongated more significantly,and the relatively uniform distribution of co-rich phase microstructure is obtained in the direction perpendicular to the magnetic field.After solidification,the speed of saturation magnetization of Cu-Co alloy is obviously accelerated under 10 T high magnetic field.In addition,the resistivity of the alloy decreases with the increase of magnetic field intensity and subcooling.

关 键 词：液相分离 凝固 强磁场 组织演化 

分 类 号：TG146[一般工业技术—材料科学与工程]