Liquid state dependent solidification of a Co-B eutectic alloy under a high magnetic field  

作　　者：Yixuan He Fan Bu Yuhao Wu Jianbao Zhang Dawei Luo Zhangchi Bian Qing Zhou Tie Liu Qiang Wang Jun Wang Haifeng Wang Jinshan Li Eric Beaugnon 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China [2]Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi’an 710072,China [3]Collaborative Innovation Center of NPU,Shanghai 201108,China [4]Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China [5]Univ.Grenoble Alpes,INSA Toulouse,Univ.Toulouse Paul Sabatier,EMFL,CNRS,LNCMI,38000 Grenoble,France

出　　处：《Journal of Materials Science & Technology》2022年第21期58-71,共14页材料科学技术（英文版）

基　　金：financially supported by the fund of National Key Laboratory for Precision Hot Processing of Metals(No.6142909200104);Shanghai Sailing Program;National Training Program of Innovation and Entrepreneurship for Undergraduates(No.S202010699137);Natural Science Foundation of China(Nos.51690164 and 51801161);the Fundamental Research Funds for the Central Universities。

摘　　要：The structure transition inside the Co-81.5at.%B alloy liquid has been studied by an in-situ magnetization measurement.A crossover was observed on the 1/M-T curve during the overheating process,indicating that a liquid-liquid structure transition(LLST)took place in the melt.Based on this information,the effects of LLST on the solidification behavior,microstructure and tribology property were investigated experimentally.The sample solidified with the LLST exhibits significantly different solidification behaviors,i.e.,the nucleation undercooling and the recalescence extent are conspicuously enlarged,and the solidification time is shortened.As a result,the microstructure is effectively refined and homogenized,and the hardness and wear resistance are significantly enhanced.The present work might be helpful for not only theoretically understanding the influence of LLST on the solidification behavior but also providing an alternative approach to tailor the microstructure and properties.

关 键 词：Liquid-liquid structure transition SOLIDIFICATION MAGNETIZATION Tribology property 

分 类 号：TG111.4[金属学及工艺—物理冶金]