Page 89 - 机械工程材料2024年第十一期

唐 环，等：等通道转角挤压变形超细晶纯铜的组织与性能

LIU X K，WEI Q Z，CHEN D X，et al. Effects 0.5In合金组织及电化学性能的影响 ［J］. 中国有色金
of hydrostatic pressure and soaking time on 属学报，2022，32（6）：1695-1707.
electrochemical behavior of 304 stainless steel in deep GUO H F，LI Z Y，LI Q R，et al. Effect of ECAP on
sea environment［J］. Journal of University of Science and microstructure and electrochemical properties of Mg-
Technology Liaoning，2022，45（3）：179-182. 9Al-1.5Bi-0.5In alloy［J］. The Chinese Journal of
［17］ 王爱玲，李开鸿，张哲，等. 基于等效电路模型的X90 Nonferrous Metals，2022，32（6）：1695-1707.

钢交流腐蚀动力学行为［J］. 腐蚀与防护，2022，43（7）： ［21］ 李明山. 等通道转角挤压制备超细晶铜的疲劳性

57-62. 能［D］. 西安：西安建筑科技大学，2008.
WANG A L，LI K H，ZHANG Z，et al. AC corrosion LI M S. The fatigue property of ultrafine-grained copper
electrode process of X90 steel based on equivalent circuit produced by ECAP［D］. Xi'an：Xi'an University of
model［J］. Corrosion & Protection，2022，43（7）：57-62. Architecture and Technology，2008.
［18］ 陆春慧，郑元俐，邱憬. 镍铬、钴铬合金和纯钛在人工 ［22］ 曾许多，杨丽景，张阳明，等. 等通道转角挤压Zn-22Al

唾液中的耐腐蚀性评价［J］. 上海口腔医学，2010，19（2）： 合金在NaCl水溶液中的腐蚀行为 ［J］. 中国腐蚀与防
168-172. 护学报，2014，34（2）：178-184.
LU C H，ZHENG Y L，QIU J. Study of dental alloys in ZENG X D，YANG L J，ZHANG Y M，et al. Corrosion
the artificial saliva using an electrochemical impedance behavior of equal-channel-angular-pressed Zn-22Al
spectroscopy［J］. Shanghai Journal of Stomatology， alloys in NaCl aqueous solution［J］. Journal of Chinese
2010，19（2）：168-172. Society for Corrosion and Protection，2014，34（2）：178-
［19］ 耿敏，马洋，张文东，等. 柔性还原氧化石墨烯薄膜的 184.

制备及电化学性能研究［J］. 安康学院学报，2020，32（6）： ［23］ 李鑫，董月成，淡振华，等. 等通道角挤压制备超细

115-118. 晶纯Ti的腐蚀性能研究 ［J］. 金属学报，2019，55（8）：
GENG M，MA Y，ZHANG W D，et al. Synthesis 967-975.
and electrochemical investigation of flexible reduction LI X，DONG Y C，DAN Z H，et al. Corrosion behavior
oxidation graphene film［J］. Journal of Ankang of ultrafine grained pure Ti processed by equal channel
University，2020，32（6）：115-118. angular pressing［J］. Acta Metallurgica Sinica，2019，55
［20］ 郭绘芬，李子岩，李秋睿，等. ECAP对Mg-9Al-1.5Bi- （8）：967-975.

Microstructure and Properties of Ultrafine-Grained Pure Copper Based on
Equal Channel Angular Pressing Deformation

TANG Huan , WANG Xiaoxi , ZHANG Xiang , TONG Xinlong , ZHANG Fei , CUI Haitao 1
1
1
2
1
1
(1. School of Mechanical & Electrical Engineering, Xuzhou Univercity of Technology, Xuzhou 221000, China;
2. Jiangsu XCMG Construction Machinery Research Institute Co., Ltd., Xuzhou 221004, China)
Abstract: Four-pass equal channel angular pressing (ECAP) was performed on T2 pure copper by using the BC
pathway (the specimen was rotated 90° in the same direction around its axis at each ECAP) at room temperature, the
microstructure, mechanical properties and corrosion resistance of the pure copper before and after ECAP deformation
for different passes (one-pass, four-pass) were studied. The results show that after one-pass ECAP deformation, a
large banded structure was formed in the pure copper, and the direction of the band was at 30°‒45° to the direction of
shear stresses. After four-pass ECAP deformation, the pure copper grains were broken and refined significantly, a
large number of ultrafine-equiaxed grained structures appeared, and the average grain size was about 0.96 μm. The
microhardness and tensile strength of the pure copper after four-pass ECAP deformation significantly increased by
43.8% and 51.5%, respectively. With the increase of ECAP pass, the solution resistance, charge transfer resistance and
polarization resistance of the pure copper increased, the open circuit potential and self-corrosion potential increased, and
the self-corrosion current density decreased, indicating the corrosion resistance was improved.
Key words: ECAP deformation; alternating shear stress; ultrafine-grained pure copper; mechanical property;
corrosion resistance
81