Zr/CoCrFeMnNi HEA钎焊接头界面组织与力学性能研究  

Interfacial Microstructure and Mechanical Properties of Zr/CoCrFeMnNiHEA Brazed Joints

作　　者：杜鹏[1] 宋晓国[1,2] 龙伟民 卞红 秦建 孙华为 姜楠 Du Peng;Song Xiaoguo;Long Weimin;Bian Hong;Qin Jian;Sun Huawei;Jiang Nan(State Key Laboratory of Precision Welding&Joining of Materials and Structures,Harbin Institute of Technology,Harbin 150001,China;Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology,Weihai 264209,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China)

机构地区：[1]哈尔滨工业大学材料结构精密焊接与连接全国重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工业大学(威海)山东省特种焊接技术重点实验室,山东威海264209 [3]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,河南郑州450001

出　　处：《稀有金属材料与工程》2025年第2期385-393,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52275321,52205348);山东省自然科学基金(ZR2023JQ021);浙江省“尖兵”“领雁”研发攻关计划项目(2024C01086)。

摘　　要：采用AgCu钎料实现了Zr合金与CoCrFeMnNi HEA之间的钎焊连接。研究了钎焊温度与保温时间对接头显微组织演化与力学性能的影响规律。结果表明:在钎焊温度为850℃,保温时间为10 min的条件下,接头界面的典型微观组织为:HEA/C_(rss)/Zr(Cr,Mn)_(2)/Zr_(2)(Co,Cu,Ni,Fe)+Zr_(2)(Ag,Cu)+Zr(Cr,Mn)_(2)/Zr,接头的平均抗剪切强度最高可达103.1 MPa。随着钎焊温度的升高或保温时间的增加,扩散反应区内的富Cr基固溶体层和Zr(Cr,Mn)_(2)层厚度增厚,钎缝中心区内Zr_(2)(Co,Cu,Ni,Fe)相和Zr(Cr,Mn)_(2)相含量增多,Zr_(2)(Ag,Cu)相所占比例减小。最后,分析了接头的失效机制,在剪切力的作用下,随着钎焊温度和保温时间的增加,接头的断裂位置从扩散反应区的Zr(Cr,Mn)_(2)层转移到钎缝中心区的Zr_(2)(Co,Cu,Ni,Fe)脆性相断裂。AgCu filler was used to braze Zr and CoCrFeMnNi high-entropy alloy(HEA).The effects of brazing temperature and holding time on the microstructure and mechanical properties of the joints were analyzed.The results show that the typical microstructure of the joints brazed at 850℃for 10 min is HEA/C_(rss)/Zr(Cr,Mn)_(2)/Zr_(2)(Co,Cu,Ni,Fe)+Zr_(2)(Ag,Cu)+Zr(Cr,Mn)_(2)/Zr.The joints have the maximum shear strength of 103.1 MPa.As the brazing temperature or holding time rises,the thickness of Cr-rich solid solution and Zr(Cr,Mn)_(2)layer are increased,the content of Zr_(2)(Co,Cu,Ni,Fe)and Zr(Cr,Mn)_(2)phase is increased whereas the content of Zr_(2)(Ag,Cu)phase is decreased.Finally,the failure mechanism of the joint was analyzed.Under the action of shear force,as the brazing temperature or holding time rises,the fracture position of the joint shifts from the Zr(Cr,Mn)_(2)layer to the Zr_(2)(Co,Cu,Ni,Fe)phase fracture in the center of the brazing seam.

关 键 词：CoCrFeMnNi HEA ZR合金 钎焊接头 显微组织 力学性能 

分 类 号：TG454[金属学及工艺—焊接]