Sn及深冷拉拔对Cu-Cr-Zr合金组织和性能的影响

doi:10.13251/j.issn.0254-6051.2023.05.015

金属热处理 ›› 2023, Vol. 48 ›› Issue (5): 90-97.DOI: 10.13251/j.issn.0254-6051.2023.05.015

Sn及深冷拉拔对Cu-Cr-Zr合金组织和性能的影响

陈金水¹, 王冲¹, 郭诚君^1,2, 彭炳锋³, 张建波^1,2, 肖翔鹏^1,2, 杨斌¹

1.江西理工大学材料冶金化学学部, 江西赣州 341000;
2.江西理工大学江西先进铜产业研究院, 江西鹰潭 335000;
3.江西广厚科技协同创新有限公司, 江西鹰潭 335000

收稿日期:2022-10-25 修回日期:2023-03-16 出版日期:2023-05-25 发布日期:2023-06-21
通讯作者: 杨斌,教授,博士,E-mail: yangbin@jxust.edu.cn
作者简介:陈金水(1993—),男,博士研究生,主要研究方向为高性能铜合金制备加工及表征,E-mail: chenjinshui0797@163.com。
基金资助:
国家科技部重点研发计划(2016YFB0301400);国家自然科学基金(51561008, 51804138, 51761013);江西省科技攻关项目(20181BCB19003);江西理工大学清江青年优秀人才支持计划;宁波有色合金新材料创新联盟项目(2021H003)

Effects of Sn and cryogenic drawing on microstructure and properties of Cu-Cr-Zr alloys

Chen Jinshui¹, Wang Chong¹, Guo Chengjun^1,2, Peng Bingfeng³, Zhang Jianbo^1,2, Xiao Xiangpeng^1,2, Yang Bin¹

1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China;
2. Jiangxi Advanced Copper Industry Research Institute, Jiangxi University of Science and Technology, Yingtan Jiangxi 335000, China;
3. Jiangxi Guanghou Technology Collaborative Innovation Co., Ltd., Yingtan Jiangxi 335000, China

Received:2022-10-25 Revised:2023-03-16 Online:2023-05-25 Published:2023-06-21

摘要/Abstract

摘要： 采用真空铸造的方法制备了不同Sn含量的Cu-Cr-Zr-xSn合金,利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)等检测方法分析了Cu-Cr-Zr-xSn合金在多阶段形变热处理过程中(杆坯→一次拉拔→950 ℃固溶1 h→二次拉拔→450 ℃峰时效→室温拉拔/深冷拉拔→450 ℃退火)微观组织的变化,同时测定了相应的抗拉强度和导电率。重点研究了Sn元素和深冷拉拔对Cu-Cr-Zr合金组织和性能的影响规律。结果表明,添加Sn和深冷拉拔都能够明显提高Cu-Cr-Zr合金的抗拉强度,同时不会对导电率造成太大的损失。其中Sn元素会促进富Cr初生相的形成,在形变热处理过程中,富Cr初生相会被拉成纤维状,起到纤维强化的效果;深冷拉拔则会提高变形抗力,从而导致变形晶粒尺寸更小,同时也能够促使富Cr初生相转变为纤维状,进一步提高合金的强度。

关键词: Cu-Cr-Zr合金, Sn元素, 深冷拉拔, 形变热处理, 晶粒细化

Abstract: Cu-Cr-Zr-xSn alloys with different Sn contents were prepared by vacuum casting. Optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope(TEM) were used to analyze the microstructure evolution of the Cu-Cr-Zr-xSn alloys in the process of multi-stage thermo-mechanical treatment (rod blank→first drawing→950 ℃ solution treatment for 1 h→secondary drawing→peak aging at 450 ℃→room temperature drawing or cryogenic drawing→450 ℃ annealing), and the corresponding tensile strength and conductivity were measured. The effects of Sn element and cryogenic drawing on microstructure and properties of Cu-Cr-Zr alloy were mainly studied. The results show that both the Sn element and the cryogenic drawing can significantly improve the tensile strength of Cu-Cr-Zr alloy without causing too much loss of conductivity, where the Sn element will promote the formation of the Cr-rich primary phase. During the thermo-mechanical treatment process, the Cr-rich primary phase will be drawn into a fiber shape, which has the effect of fibre strengthening. Cryogenic drawing can improve the deformation resistance, resulting in a smaller deformed grain size, and also promote the Cr-rich primary phase to transform into a fibrous shape, which further improves the strength of the alloy.

Key words: Cu-Cr-Zr alloy, Sn element, cryogenic drawing, thermo-mechanical treatment, grain refinement

中图分类号:

TG146.1

陈金水, 王冲, 郭诚君, 彭炳锋, 张建波, 肖翔鹏, 杨斌. Sn及深冷拉拔对Cu-Cr-Zr合金组织和性能的影响[J]. 金属热处理, 2023, 48(5): 90-97.

Chen Jinshui, Wang Chong, Guo Chengjun, Peng Bingfeng, Zhang Jianbo, Xiao Xiangpeng, Yang Bin. Effects of Sn and cryogenic drawing on microstructure and properties of Cu-Cr-Zr alloys[J]. Heat Treatment of Metals, 2023, 48(5): 90-97.

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Sn及深冷拉拔对Cu-Cr-Zr合金组织和性能的影响

Effects of Sn and cryogenic drawing on microstructure and properties of Cu-Cr-Zr alloys

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