A Novel Micro-Scale Plastic Deformation Feature on a Bulk Metallic Glass Surface under Laser Shock Peening  

作　　者：WEI Yan-Peng WEI Bing-Chen WANG Xi XU Guang-Yue LI Lei WU Xian-Qian SONG Hong-Wei HUANG Chen-Guang 魏延鹏;魏炳忱;王曦;徐光跃;李磊;吴先前;宋宏伟;黄晨光(Key Laboratory for Mechanics in Fluid-Solid Coupling Systems,Chinese Academy of Sciences,Beijing 100190;Key Laboratory of Microgravity(National Microgravity Laboratory),Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190;Sinosteel Corporation,Beijing 100190)

机构地区：[1]Key Laboratory for Mechanics in Fluid-Solid Coupling Systems,Chinese Academy of Sciences,Beijing 100190 [2]Key Laboratory of Microgravity(National Microgravity Laboratory),Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190 [3]Sinosteel Corporation,Beijing 100190

出　　处：《Chinese Physics Letters》2013年第3期112-115,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 11002150;the Basic Research Equipment Project of the Chinese Academy of Sciences under Grant No YZ200930;the National Basic Research Program of China under Grant No 2007CB613905.

摘　　要：Laser shocking peening is a widely applied surface treatment technique that can effectively improve the fatigue properties of metal parts.We observe many micro-scale arc plastic steps on the surface of Zr_(47.9)Ti_(0.3)Ni_(3.1)Cu_(39.3)Al_(9.4) metallic glass subjected to the ultra-high pressure and strain rate induced by laser shock peening.The scanning electronic microscopy and atomic force microscopy show that the arc plastic step(APS)has an arc boundary,50–300 nm step height,5–50μm radius and no preferable direction.These APSs have the ability to accommodate plastic deformation in the same way as shear band.This may indicate a new mechanism to accommodate the plastic deformation in amorphous metallic glass under high pressure,ultra-high strain rates,and short duration.

关 键 词：DEFORMATION fatigue METALLIC 

分 类 号：TG1[金属学及工艺—金属学]