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A quantitative link between microplastic instability and macroscopic deformation behaviors in metallic glasses

J. Appl. Phys. 106, 083512 (2009); doi:10.1063/1.3247968

Published 22 October 2009

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Y. Wu,1 G. L. Chen,1 X. D. Hui,1 C. T. Liu,2 Y. Lin,2 X. C. Shang,3 and Z. P. Lu1
1State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
2Department of Mechanical Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
3Department of Mathematics and Mechanics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
Based on mechanical instability of individual shear transformation zones (STZs), a quantitative link between the microplastic instability and macroscopic deformation behavior of metallic glasses was proposed. Our analysis confirms that macroscopic metallic glasses comprise a statistical distribution of STZ embryos with distributed values of activation energy, and the microplastic instability of all the individual STZs dictates the macroscopic deformation behavior of amorphous solids. The statistical model presented in this paper can successfully reproduce the macroscopic stress-strain curves determined experimentally and readily be used to predict strain-rate effects on the macroscopic responses with the availability of the material parameters at a certain strain rate, which offer new insights into understanding the actual deformation mechanism in amorphous solids. ©2009 American Institute of Physics
History: Received 14 July 2009; accepted 18 September 2009; published 22 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/083512/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.40.Lm
    Deformation, plasticity, and creep
  • 62.20.fq
    Plasticity and superplasticity of solids
  • 61.43.Fs
    Structure of glasses
  • 81.40.Jj
    Elasticity and anelasticity, stress-strain relations
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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