Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 861, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.158632
Keywords
Strain rate sensitivity; Hardness; Metallic glass; Thermal cycling; Flow unit
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Funding
- Natural Science Foundation of Shaanxi Province [2019TD-020]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JM-41, 2020JM-33]
- National Natural Science Foundation of China [51471131]
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The study evaluated the effects of positive and negative flow unit sizes on strain rate sensitivity (SRS) by altering the microstructural features of magnetron sputtering CuZr MG, showing that the sizes of flow units play crucial roles in determining the magnitude of SRS.
Strain rate sensitivity (SRS) is an effective parameter to demonstrate the deformation mechanism of metallic materials. However, despite extensive research, the meanings of the SRS of metallic glasses (MGs) were still vague and controversial results largely remained. In the present study, with altering the microstructural features of the magnetron sputtering CuZr MG before and after thermal cycling treatment, the effects of size of both positive and negative flow units on SRS were evaluated by amplitude-modulation atomic force microscopy (AM-AFM) and nanoindentation testing. Positive SRS index m was derived in the CuZr MG, and m increased from 0.014 to 0.040 after thermal cycling. The mechanism of the enhanced SRS and underlying microstructural evolution were explored and proposed. It shows the competition between time scales of atom rearrangement within flow units and applied loading strain rate causes the change of SRS, and both the size of positive and negative flow units play crucial roles in determining the magnitude of SRS. (C) 2021 Elsevier B.V. All rights reserved.
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