Modulating heterogeneity and plasticity in bulk metallic glasses: Role of interfaces on shear banding

被引：106

作者：

Kosiba, K. ^{[1
]}

Sopu, D. ^{[2
,3
]}

Scudino, S. ^{[1
]}

Zhang, L. ^{[4
]}

Bednarcik, J. ^{[5
]}

Pauly, S. ^{[1
]}

机构：

[1] IFW Dresden, Inst Complex Mat, Helmholtzstr 20, D-01069 Dresden, Germany

[2] Tech Univ Darmstadt, Inst Mat Wissensch, Otto Berndt Str 3, D-64287 Darmstadt, Germany

[3] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

[4] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China

[5] DESY Photon Sci, Notkestr 85, D-22607 Hamburg, Germany

来源：

INTERNATIONAL JOURNAL OF PLASTICITY | 2019年 / 119卷

关键词：

FREE-VOLUME; MECHANICAL-BEHAVIOR; AMORPHOUS METALS; RESIDUAL-STRESS; DEFORMATION; DYNAMICS; TRANSITION; REJUVENATION; TEMPERATURE; RELAXATION;

D O I：

10.1016/j.ijplas.2019.03.007

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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.

引用

页码：156 / 170

页数：15

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