期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 586, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2022.121559
关键词
Metallic glasses; Coating; Tensile deformation; Cyclic deformation; Molecular dynamics
资金
- Faculty of Engineering of The Hong Kong Polytechnic University [1-45-37-99QP]
A comparative study was conducted to investigate the effects of Cu coating on the deformation behavior of metallic glass and crystalline Cu-coated metallic glass. The results showed that Cu coating can improve the tensile ductility of metallic glass while suppressing shear band activation during cyclic loading.
In this work, a comparative study was undertaken to investigate the effects of Cu coating on the deformation behaviour of metallic glass (MG) and crystalline Cu-coated MG under monotonic tensile loading and cyclic compressive-tensile loading by means of atomistic simulations. The results showed that under monotonic tensile loading, yielding first occurs in the Cu coating due to its low elastic limit, while plasticity in the MG core is directly triggered by the transfer of crystal plasticity from the Cu coating across the well-bonded crystalline amorphous interfaces. The Cu coating serves as an effective medium for nucleating multiple shear bands, thus resulting in an improvement of tensile ductility. However, under cyclic loading, yielding tends to initiate via shear band activation in the interior of the Cu-coated MG. The Cu coating serves as effective barrier to suppress shear band initiation on the free surfaces, thus giving rise to enhanced fatigue life of the Cu-coated MG. The interlay bounding condition is also verified as playing a crucial role on the fatigue performance in the Cu-coated MG. The findings provide valuable insights on the effect of crystalline metal coating on the tensile and cyclic deformation mechanisms of MGs from an atomistic perspective.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据