Enhancement of Plasticity of Highly Density-Fluctuated Cu-Zr Amorphous Alloy

초록

This study explores the plastic deformability of highly density fluctuated states due to the different thermal quenching process of the binary amorphous metals Zr67Cu33 with embedded nanocrystals Zr2Cu To know the effect of local structural fluctuation we prepare 5 computational models with Zr2Cu-nanocrystals that undergo rapid heat up and cool down The region of nanocrystals is corresponding to the dense area because the intrinsic density of crystal is greater than that of amorphous structure Due to the distribution of nanocrystals the artificially constructed models have highly density-fluctuated structures (called structural inhomogeneity) Strain localization during plastic deformation is much retarded at structural-inhomogeneous model in tensile loading We found that structural inhomogeneity promotes more homogenous deformation (call deformable homogeneity" that is retarded strain localization) even in globally recognized elastic region while structural homogeneity (almost close to pure amorphous structure) makes catastrophic inhomogeneous deformation (catastrophic shear band) [doi 10 2320/matertrans M2010144]

키워드