Evading strength−ductility trade-off of GH605 alloy using magnetic field-assisted undercooling treatment  

利用磁场深过冷处理避免GH605合金强度−塑性的失衡

作　　者：Yi-xuan HE Fan BU Zhang-chi BIAN Ming-xiu XIANG Meng-meng ZHOU Xu-dong LIU Lei ZHU Jun WANG Jin-shan LI 贺一轩;卜凡;边张驰;相明秀;周蒙蒙;刘栩东;朱雷;王军;李金山(西北工业大学凝固技术国家重点实验室,西安710072;西北工业大学先进密封材料与润滑研究中心,西安710072;西北工业大学上海创新协同中心,上海201108;西北工业大学超导材料与应用技术研究院,西安710072;西安理工大学陕西省电工材料与熔(浸)渗透技术重点实验室,西安710048)

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]Institute of Superconducting Materials and Applied Technology,Northwestern Polytechnical University,Xi’an 710072,China [5]Shaanxi Key Laboratory of Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an 710048,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第8期2575-2588,共14页中国有色金属学报（英文版）

基　　金：the fund of National Key Laboratory for Precision Hot Processing of Metals,China(No.6142909200104);State Key Laboratory of Solidification Processing(NPU),China(No.2022-TS-08);National Training Program of Innovation and Entrepreneurship for Undergraduates.We thank Dr.ZHENG from ZKKF(Beijing)Science&Technology Company for supporting the characterization of the materials.

摘　　要：Undercooling solidification under a magnetic field(UMF)is an effective way to tailor the microstructure and properties of Co-based alloys.In this study,by attributing to the UMF treatment,the strength−ductility trade-off dilemma in GH605 superalloy is successfully overcome.The UMF treatment can effectively refine the grains and increase the solid solubility,leading to the high yield strength.The main deformation mechanism in the as-forged alloy is dislocation slipping.By contrast,multiple deformation mechanisms,including stacking faults,twining,dislocation slipping,and their strong interactions are activated in the UMF-treated sample during compression deformation,which enhances the strength and ductility simultaneously.In addition,the precipitation of hard Laves phases along the grain boundaries can be obtained after UMF treatment,hindering crack propagation during compression deformation.磁场下的过冷处理(UMF)是一类有效调控钴基合金微观结构和性能的方法。通过UMF处理同时提升GH605钴基高温合金的强度和塑性。结果表明,在UMF处理后,合金的晶粒显著细化,基体相固溶度增加,且合金的屈服强度提升。在原始锻态合金中,位错滑移为主要的变形机制;经过UMF处理后,多种变形机制如层错、孪生、位错滑移及其交互作用在压缩变形过程中被激活,导致合金的强度和塑性同时提高。此外,经UMF处理后,可获得沿晶界析出的硬质Laves相,该硬质相可有效阻碍压缩变形过程中裂纹的扩展。

关 键 词：undercooling treatment magnetic field GH605 alloy strengthening mechanisms 

分 类 号：TG156.91[金属学及工艺—热处理] TG132.3[金属学及工艺—金属学]