Structural rejuvenation in a bulk metallic glass induced by severe plastic deformation
- ORNL
- Institute for Materials Research (IMR), Sendai, Japan
- University of Tennessee, Knoxville (UTK)
- Argonne National Laboratory (ANL)
- Toyohashi University of Technology, Japan
- National Institute for Materials Science, Tsukuba, Japan
- Tohoku University, Japan
- University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
Using high-energy X-ray diffraction we examined the atomic structure in bulk metallic glass samples which underwent severe plastic deformation by the high-pressure torsion (HPT) technique. We obtained the atomic pair distribution function (PDF) and determined the changes in the PDFs due to deformation. The observed changes in the PDF clearly show structural disordering, which suggests structural rejuvenation by heavy deformation. However, the changes cannot be explained simply in terms of creating excess free volume, and they indicate that much more extensive atomic rearrangements take place as a consequence of deformation. Also, we suggest that the observed structural change may well be an outcome of local heating due to deformation and may not directly provide the knowledge of the atomistic mechanism of strain localization.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1009945
- Journal Information:
- Acta Materialia, Vol. 58, Issue 2; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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Structural rejuvenation in bulk metallic glasses
CHARACTERIZATION OF PLASTICALLY-INDUCED STRUCTURAL CHANGES IN A Zr-BASED BULK METALLIC GLASS USING POSITRON ANNIHILATION SPECTROCOPY