Size effects on plastic deformation behavior in micro radial compression of pure copper  

纯铜径向微压缩塑性变形行为尺寸效应(英文)

作　　者：程利东[1] 王传杰[2] 王春举[2] 郭斌[2] 王振龙[1] 

机构地区：[1]哈尔滨工业大学 机电工程学院,哈尔滨150001 [2]哈尔滨工业大学 材料科学与工程学院,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第9期2686-2691,共6页中国有色金属学报（英文版）

基　　金：Project(51375113)supported by the National Natural Science Foundation of China

摘　　要：Micro radial compression tests were carried out on cylindrical specimens of pure copper polycrystals with different grain sizes. Experimental results indicated that phenomena of decreasing forming force, increasing scatter of forming force and more irregular surface topography occurred with the increase of grain size. A modified surface model based on dislocations pile-up in surface layer grains, and a flow stress scattering formulation based on standard deviation and grain size distribution were proposed to analyze size effects on forming force in micro compression. The inhomogeneous deformation of surface layer grains was discussed by the main deformation manner of rotation. A good agreement with the experimental results was achieved.对不同晶粒尺寸的纯铜多晶体圆柱试样,开展径向微压缩试样。实验结果表明,随着晶粒尺寸的增大,成形力减弱,分散性增大,并出现不规则表面。提出了基于表层晶粒位错堆积的修正表层模型和基于标准偏差理论和晶粒尺寸分布的流动应力波动性公式,分析了微压缩变形中的成形力尺寸效应。从表层晶粒以旋转为主要变形模式的角度,讨论了表层晶粒非均匀塑性变形。与实验结果吻合很好。

关 键 词：MICRO-FORMING size effects radial compression inhomogeneous deformation scatter of forming force 

分 类 号：TG146.11[一般工业技术—材料科学与工程]