Modulating heterogeneity and plasticity in bulk metallic glasses: Role of interfaces on shear banding
Modulating heterogeneity and plasticity in bulk metallic glasses: Role of interfaces on shear banding
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DOI：
10.1016/j.ijplas.2019.03.007
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发表时间：
2019-08-01
影响因子：
9.8
通讯作者：
Pauly, S.
中科院分区：
文献类型：
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作者：
Kosiba, K.;Sopu, D.;Pauly, S.
在单片金属玻璃的结构不均匀性，即自由体积变化或应力/应变场，是已知的是关键的塑性，但它们如何影响不可逆变形的机制仍然知之甚少。我们表明，快速退火是一个有能力的工具，用于修改的自由体积含量及其分布，它创建非仿射应力场在单片CuZr基大块金属玻璃。而不是总的自由体积，μ m尺度的放松和恢复活力的玻璃区域管理塑性变形。互补的分子动力学模拟支持的重要性，放松和恢复活力的剪切带增殖量之间的接口。我们不仅可以达到无与伦比的亚稳状态的金属玻璃与本方法，但也更好地理解机制的整体，但结构异质性的金属玻璃的塑性。
Structural heterogeneities in monolithic metallic glasses, i.e. free volume variations or stress/strain fields, are known to be pivotal for their plasticity but the mechanisms how they affect irreversible deformation remain poorly understood. We show that flash-annealing is a capable tool for modifying the free volume content and its distribution, which creates non-affine stress fields in a monolithic CuZr-based bulk metallic glass. Rather than the overall free volume, mu m-scale regions of relaxed and rejuvenated glass govern plastic deformation. Complementary molecular dynamics simulations underpin the importance of the interfaces between relaxed and rejuvenated volumes for shear band proliferation. Not only can we reach unmatched states of metastability in metallic glasses with the present approach but also better understand the mechanisms underlying plasticity in monolithic but structurally heterogeneous metallic glasses.