金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 199-203.DOI: 10.13251/j.issn.0254-6051.2022.05.033

• 工艺研究 • 上一篇    下一篇

热处理对Al0.5CoCrFeNi高熵合金钎焊接头组织及性能的影响

齐浩伟, 刘学文, 刘乐, 曹志明, 贾德浩, 章强   

  1. 临沂大学 材料科学与工程学院, 山东 临沂 276000
  • 收稿日期:2021-12-23 修回日期:2022-03-17 出版日期:2022-05-25 发布日期:2022-06-16
  • 通讯作者: 章 强,讲师,博士,E-mail: zhangqiang@lyu.edu.cn
  • 作者简介:齐浩伟(1999—),男,学士,主要研究方向为高熵合金的焊接,E-mail: 1286394425@qq.com。
  • 基金资助:
    国家自然科学基金青年基金(52105353);山东省自然科学基金青年基金(ZR2020QE176);临沂大学大学生创新创业项目(X202110452006)

Effect of heat treatment on microstructure and properties of Al0.5CoCrFeNi high-entropy alloy brazed joints

Qi Haowei, Liu Xuewen, Liu Le, Cao Zhiming, Jia Dehao, Zhang Qiang   

  1. School of Materials Science and Engineering, Linyi University, Linyi Shandong 276000, China
  • Received:2021-12-23 Revised:2022-03-17 Online:2022-05-25 Published:2022-06-16

摘要: 采用TiZrCuNi钎料对Al0.5CoCrFeNi高熵合金进行钎焊连接后对其进行退火处理,研究了800 ℃下不同退火时间对钎焊接头微观组织和力学性能的影响。通过扫描电镜(SEM)、能谱仪(EDS)分析了钎焊接头微观组织及相组成,利用万能试验机测定了热处理前后试样的剪切性能。结果表明,钎焊接头的典型微观组织分为焊缝区、熔合区和热影响区3部分,焊缝区的组织主要为高熵合金相和BCC结构的FeCr基固溶体;随着退火保温时间的延长,钎焊接头焊缝区灰色相中逐步析出细小的黑色相,对接头起到了一定的弥散强化作用,微观组织更为均匀细小,钎焊接头的剪切强度由未经退火处理的554.8 MPa增加到退火12 h后的581.1 MPa。

关键词: 真空钎焊, TiZrCuNi钎料, Al0.5CoCrFeNi高熵合金, 退火, 连接性能

Abstract: Al0.5CoCrFeNi high-entropy alloy was brazed and connected with TiZrCuNi solder and then annealed, the effect of annealing time at 800 ℃ on microstructure and mechanical properties of the Al0.5CoCrFeNi high-entropy alloy brazed joint was studied. The microstructure and phase composition of the brazed joints were analyzed by means of scanning electron microscope (SEM) and energy dispersive spectroscope (EDS). The shear strength of the specimens before and after heat treatment was measured by universal testing machine. The results show that the typical microstructure of brazed joint can be divided into weld zone, fusion zone and heat affected zone. The microstructure of weld zone mainly consists of high-entropy alloy phases and FeCr based solid solution with BCC structure. With the increase of annealing time, fine black phase gradually precipitates from the gray phase in the brazing seam, which has a certain dispersion strengthening effect on the joint, and the microstructure is finer and uniform. The shear strength of brazed joint increases from 554.8 MPa before annealing to 581.1 MPa after annealing at 800 ℃ for 12 h.

Key words: vacuum brazing, TiZrCuNi solder, Al0.5CoCrFeNi high-entropy alloy, annealing, connection performance

中图分类号: