4.6 Article

Improving plasticity of the Zr46Cu46Al8 bulk metallic glass via thermal rejuvenation

Journal

SCIENCE BULLETIN
Volume 63, Issue 13, Pages 840-844

Publisher

SCIENCE PRESS
DOI: 10.1016/j.scib.2018.04.021

Keywords

Bulk metallic glasses; Cryogenic thermal cycling; Defect density; Plasticity

Funding

  1. National Natural Science Foundation of China [51671018, 11790293, 51531001, 51422101, 51371003, 51671021]
  2. 111 Project [B07003]
  3. International S&T Cooperation Program of China [2015DFG52600]
  4. Program for Changjiang Scholars and Innovative Research Team in University of China [IRT_14R05]
  5. SKLAMM-USTB [2016Z-04, 2016-09, 2016Z-16]
  6. Top-Notch Young Talents Program
  7. Fundamental Research Fund for the Central Universities [FRF-TP-15-004C1]

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In this paper, effects of cryogenic thermal cycling on deformation behavior and thermal stability of the Zr46Cu46Al8 bulk metallic glass (BMG) were studied. The results show that with the increase of the number of cryogenic thermal cycles (CTC), thermal stability remains almost unchanged, while the plasticity is increased, indicating that the cryogenic thermal cyclic treatment is an effective way to improve plasticity of metallic glasses without distinctly deteriorating thermal stability. Our analysis suggests that the increase in the defect density resulted from the cryogenic thermal treatments are responsible for the plasticity increment. Variation of yield strength can be well interpreted from microstructural percolation which affected by both density and characteristic volume of the defect sites. (C) 2018 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

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