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Title: Structural relaxation driven increase in elastic modulus for a bulk metallic glass

The change in elastic modulus as a function of temperature was investigated for a zirconium-based bulk metallic glass. High temperature nano-indentation was done over a wide temperature range from room temperature to the glass-transition. At higher temperature, there was a transition from inhomogeneous to homogeneous deformation, with a decrease in serrated flow and an increase in creep displacement. Hardness was found to decrease, whereas elastic modulus was found to increase with temperature. The increase in elastic modulus for metallic glass at higher temperature was explained by diffusive rearrangement of atoms resulting in free volume annihilation. This is in contrast to elastic modulus increase with temperature for silicate glasses due to compaction of its open three dimensional coordinated structure without any atomic diffusion.
Authors:
; ;  [1]
  1. Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203 (United States)
Publication Date:
OSTI Identifier:
22399226
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMS; CREEP; DEFORMATION; DIFFUSION; HARDNESS; METALLIC GLASSES; PHASE TRANSFORMATIONS; RELAXATION; SILICATES; TEMPERATURE DEPENDENCE; THREE-DIMENSIONAL CALCULATIONS; THREE-DIMENSIONAL LATTICES; ZIRCONIUM; ZIRCONIUM BASE ALLOYS