Macroscopic tensile plasticity of Zr-based bulk metallic glass with surface screw thread shaped structure

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:673

Article

Gao, M.¹  Wang, C.¹  Dong, J.²  Huan, Y.²  Bai, H. Y.¹  Wang, W. H.¹ 

[1] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China

关键词: Bulk metallic glass;    Surface screw thread shaped structure;    Macroscopic tensile plasticity;    Multiple shear bands;    Stress field torsion;   

DOI  :  10.1016/j.msea.2016.07.024

来源: Elsevier

【 摘 要 】

Zr-based bulk metallic glass (BMG) dog-bone-shaped tensile specimens with designed screw thread shaped (STS) structures fabricated by mechanical turning were tested under uniaxial tensile loading. Obvious macroscopic tensile plasticity and serrated flow behavior appear when the typical size of STS structures-the depth reaches the intrinsic plastic zone size for MGs. Finite element analysis show the introduced STS structure twists the stress field distribution and then hampers the main shear band propagation and promotes the formation of multiple shear bands, which improve the tensile plasticity. The proposed STS designing scheme may shed light on the deformation mechanism and be helpful for structural application of BMGs. (C) 2016 Elsevier B.V. All rights reserved.

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