Hardness, yield strength, and plastic flow in thin film metallic-glass

被引：51

作者：

Ye, J. C. ^{[1
]}

Chu, J. P. ^{[2
]}

Chen, Y. C. ^{[1
,2
]}

Wang, Q. ^{[3
]}

Yang, Y. ^{[1
,4
]}

机构：

[1] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

[2] Natl Taiwan Univ Sci & Technol, Dept Mat Sci & Engn, Taipei 10607, Taiwan

[3] Shanghai Univ, Lab Microstruct, Shanghai 200072, Peoples R China

[4] City Univ Hong Kong, Dept Mech & Biomed Engn, Ctr Adv Struct Mat, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 112卷 / 05期

关键词：

MECHANICAL-BEHAVIOR; DEFORMATION; TRANSITION; FRACTURE; BRITTLE; STATE;

D O I：

10.1063/1.4750028

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Thin film metallic-glasses (TFMGs) are a promising structural material for fabricating the next generation of micro-and nano-devices; however, a comprehensive study is still lacking today for understanding their mechanical behaviors. In this article, we present a systematic study on the Zr53Cu29Al12Ni6 TFMGs with varying thicknesses. Other than the intrinsic factor of structural amorphousness, our study pinpoints other extrinsic variables that could affect the hardness and yield strength of the TFMGs. Furthermore, the experimental results from microcompression show that the plastic flow in the TFMG-based micropillars exhibit strong sample size-and-shape dependence, which manifests as a smooth plastic deformation transition from the inhomogeneous to homogeneous mode when the TFMG-based micropillars with a submicron-scale film thickness are deformed into the shape of a low aspect ratio. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4750028]

引用

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