Low temperature uniform plastic deformation of metallic glasses during elastic iteration

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• 作者：Takeshi Fujita^a ; Zheng Wang^b ; Yanhui Liu^a ; Howard Sheng^c ; Weihua Wang^b ; Mingwei Chen^a ; ^d ; ^{mwchen@wpi-aimr.tohoku.ac.jp}
• 关键词：Metallic glasses ; Simulation ; Plastic deformation
• 刊名：Acta Materialia
• 出版年：2012
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：May, 2012
• 卷：60
• 期：9
• 页码：3741-3747
• 文件大小：1366 K

摘要

Molecular dynamics simulations and dynamic mechanical analysis experiments were employed to investigate the mechanical behavior of metallic glasses subjected to iteration deformation in a nominally elastic region. It was found that cyclic deformation leads to the formation of irreversible shear transformation zones (STZs) and a permanent uniform strain. The initiation of STZs is directly correlated with the atomic heterogeneity of the metallic glass and the accumulated permanent strain has a linear relation with the number of STZs. This study reveals a new deformation mode and offers insights into the atomic mechanisms of STZ formation and low temperature uniform plastic deformation of metallic glasses.