多向压缩制备纳米晶纯铜  

Preparation of Nanocrystalline Pure Copper by Multi-Directional Compression

作　　者：王雪 张金龙 杨志斌 王征 朱志剑 李欣 WANG Xue;ZHANG Jinlong;YANG Zhibin;WANG Zheng;ZHU Zhijian;LI Xin(School of Materials Engineering,Xi'an Aeronautical University,Xi'an 710077,China)

机构地区：[1]西安航空学院材料工程学院,陕西西安710077

出　　处：《热加工工艺》2024年第16期156-158,共3页Hot Working Technology

基　　金：陕西省自然科学基础研究计划资助项目(2019JM-247);大学生创新创业训练计划项目(202111736002)。

摘　　要：对纯铜进行了多向压缩变形,通过光学显微镜、透射电镜观察了变形铜的微观组织,分析了组织演变规律;表征了变形铜硬度、导电率及其真应力-应变关系,总结了性能变化趋势。结果表明:纯铜随着多向压缩累计应变的增加,晶粒互相缠绕,平直的晶界变弯,晶粒之间颜色差异消失,组织不断细化,原始晶界处形成了较宽的细晶粒区,累计应变达到Σ12.8时,组织内形成由亚晶转化而来的约100 nm的晶粒;纯铜的硬度随多向压缩累计应变的增加而增加,导电率随多向压缩累计应变的增加而减少,硬度达到软态纯铜的2倍,且保留较高的导电率。真应力-真应变曲线也反映出多向压缩对纯铜的强化作用。The pure copper was deformed by multi-directional compression.The microstructure of pure copper was observed by OM and TEM,and the rule of microstructure evolution was analyzed.The hardness,conductivity and true stress-strain relationship of the deformed copper were characterized,and the changing trend of properties was summarized.The results show that with the increase of the cumulative strain of multi-directional compression,the grains of pure copper are intertwined with each other,the straight grain boundary is bent,the color difference between grains disappears,the microstructure is refined continuously,a wide fine grain area is formed at the original grain boundary,and when the cumulative strain reachesΣ12.8,about 100 nm grains transformed from sub crystals are formed in the structure;the hardness of pure copper increases with the increase of the cumulative strain of multi-directional compression,and the conductivity decreases with the increase of the cumulative strain of multi-directional compression,the hardness reaches twice than that of soft pure copper,and the conductivity remains high.The true stress-strue train curve also reflects the strengthening effect of multi-directional compression on pure copper.

关 键 词：纯铜 多向压缩 纳米晶 

分 类 号：TG379[金属学及工艺—金属压力加工]