4.7 Article

Cryogenic-temperature-induced structural transformation of a metallic glass

Journal

MATERIALS RESEARCH LETTERS
Volume 5, Issue 4, Pages 284-291

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2016.1263687

Keywords

Metallic glass; cryogenic temperature; high-energy X-ray diffraction; flow units

Funding

  1. MOST [2015CB856800]
  2. NSF of China [51671120, 51222102]
  3. German Science Foundation (DFG) via the Leibniz Program [EC 111/26-1]
  4. European Research Council under the ERC Advanced Grant INTELHYB [ERC-2013-ADG-340025]

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The plasticity of metallic glasses depends largely on the atomic-scale structure. However, the details of the atomic-scale structure, which are responsible for their properties, remain to be clarified. In this study, in-situ high-energy synchrotron X-ray diffraction and strain-rate jump compression tests at different cryogenic temperatures were carried out. We show that the activation volume of flow units linearly depends on temperature in the non-serrated flow regime. A plausible atomic deformation mechanism is proposed, considering that the activated flow units mediating the plastic flow originate from the medium-range order and transit to the short-range order with decreasing temperature. [GRAPHICS] .

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