Co对Cu-Cr合金组织和性能的影响

doi:10.13251/j.issn.0254-6051.2022.10.015

金属热处理 ›› 2022, Vol. 47 ›› Issue (10): 94-98.DOI: 10.13251/j.issn.0254-6051.2022.10.015

Co对Cu-Cr合金组织和性能的影响

龚清华, 刘健, 陈辉明, 谢伟滨, 汪航, 杨斌

江西理工大学材料冶金化学学部, 江西赣州 341000

收稿日期:2022-05-27 修回日期:2022-08-31 出版日期:2022-10-25 发布日期:2022-12-15
通讯作者: 汪航,教授,E-mail: wanghang84@hotmail.com
作者简介:龚清华(1997—),男,硕士研究生,主要研究方向为高强高导铜合金,E-mail: 6720200596@mail.jxust.edu.cn。
基金资助:
江西省青年井冈学者计划;江西省科技厅自然科学基金青年重点项目(20192ACBL21012)

Effect of Co on microstructure and properties of Cu-Cr alloy

Gong Qinghua, Liu Jian, Chen Huiming, Xie Weibin, Wang Hang, Yang Bin

Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China

Received:2022-05-27 Revised:2022-08-31 Online:2022-10-25 Published:2022-12-15

摘要/Abstract

摘要： 研究了Cu-Cr-Co合金经80%变形量冷轧和450 ℃时效后的组织和性能,并与Cr-Cr合金进行了对比。结果表明, Cu-0.66Cr-0.05Co和Cu-0.62Cr-0.22Co合金的性能在450 ℃时效4 h时达到峰值,此时的抗拉强度、硬度及导电率分别为376 MPa和410 MPa、143.7 HV0.5和138.4 HV0.5、84.1%IACS和66.2%IACS。峰时效态Cu-Cr-Co合金析出相为体心立方结构(bcc),并与基体呈Nishiyama-Wassermann取向关系,Co含量对Cu-Cr-Co合金的晶粒形貌几乎没有影响。与Cu-Cr合金相比,Co的加入使合金时效的时间延长,硬度有所增加,抗软化性能提高,但抗拉强度和导电率均下降。由于Cu和Co在422 ℃以上具有一定的固溶度,在时效过程中部分Co逐渐固溶进基体中,形成固溶体,并没有与预测一样分布在析出相外围,降低了合金综合性能。

关键词: Cu-Cr-Co合金, 形变热处理, 性能, 显微组织

Abstract: Microstructure and properties of Cu-Cr-Co alloys after cold rolling with deformation of 80% and aging at 450 ℃ were studied and compared with Cr-Cr alloy. The results show that when aging at 450 ℃ for 4 h, the properties of Cu-0.66Cr-0.05Co and Cu-0.62Cr-0.22Co alloy reach the peak, and the tensile strength, hardness and conductivity are 376 MPa and 410 MPa, 143.7 HV0.5 and 138.4 HV0.5, 84.1%IACS and 66.2%IACS, respectively. The precipitates of the peak-aged Cu-Cr-Co alloy have a body centered cubic (bcc) structure with a Nishiyama-Wassermann orientation to the matrix, and the Co content has little effect on the grain morphology of Cu-Cr-Co alloy. Compared with Cu-Cr alloy, the addition of Co prolongs the aging time of the alloy, increases the hardness, improves the softening resistance, but decreases the tensile strength and conductivity. As Cu and Co have a certain degree of solution above 422 ℃, some of the Co gradually dissolves into the matrix during aging, forming solid solution, and is not distributed in the periphery of the precipitation phase as predicted, reducing the comprehensive properties of the alloy.

Key words: Cu-Cr-Co alloy, thermomechanical treatment, properties, microstructure

中图分类号:

TG146.1

龚清华, 刘健, 陈辉明, 谢伟滨, 汪航, 杨斌. Co对Cu-Cr合金组织和性能的影响[J]. 金属热处理, 2022, 47(10): 94-98.

Gong Qinghua, Liu Jian, Chen Huiming, Xie Weibin, Wang Hang, Yang Bin. Effect of Co on microstructure and properties of Cu-Cr alloy[J]. Heat Treatment of Metals, 2022, 47(10): 94-98.

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Co对Cu-Cr合金组织和性能的影响

Effect of Co on microstructure and properties of Cu-Cr alloy

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