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.
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.
