液氮环境下表面机械研磨处理对纯铜的影响  

Effect of different SMAT treatment times on pure copper in liquid nitrogen environment

作　　者：柏云花 杨易 李幸福 刘洋 朱心昆[1] BAI Yun-hua;YANG Yi;LI Xing-fu;LIU Yang;ZHU Xin-kun(Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《云南大学学报（自然科学版）》2023年第5期1074-1080,共7页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(51664033,51911540072,51861015).

摘　　要：使用表面机械研磨处理(surface mechanical attrition treatment,SMAT)在液氮环境中分别对退火态铜板进行30、60 s及120 s的加工处理.通过对样品进行准静态拉伸测试发现SMAT样品的屈服强度相较于退火态纯铜均提升了2-5倍,其中SMAT 60 s样品的屈服强度相比于退火态纯铜提高了211.3%,而其均匀延伸率仍可保持在24.6%.结合硬度测试和金相观察,发现处理过后的样品从表面到芯部形成了明显的梯度结构.综合结果表明在60 s SMAT处理后的样品具有最佳的强度-延展性匹配关系.Surface mechanical attrition treatment(SMAT)was conducted on annealed copper sheets under liquid nitrogen for 30 s,60 s and 120 s.The yield strength of SMAT samples was improved by 2-5 times compared to annealed pure copper by quasi-static tensile,in which the yield strength of SMAT 60 s samples was increased by 211.3%compared to annealed pure copper,while the uniform elongation could still be maintained at24.6%.Combined with the hardness test and metallographic observation,it was found that an obvious gradient structure was formed from the surface to the core of the treated sample.All results show that the samples after 60 s SMAT treatment have an optimal strength-ductility combination.

关 键 词：铜 梯度结构 表面机械研磨处理 力学性能 微观结构 

分 类 号：TG146[一般工业技术—材料科学与工程]