Structural rejuvenation in a bulk metallic glass induced by severe plastic deformation

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2009.09.021· OSTI ID:1009945

Dmowski, Wojciech ^[1]; Yokoyama, Y. ^[2]; Chuang, A. ^[3]; Ren, Y. ^[4]; Umemoto, M. ^[5]; Tsuchiya, K. ^[6]; Inoue, A. ^[7]; Egami, T. ^[8]

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1. ORNL
2. Institute for Materials Research (IMR), Sendai, Japan
3. University of Tennessee, Knoxville (UTK)
4. Argonne National Laboratory (ANL)
5. Toyohashi University of Technology, Japan
6. National Institute for Materials Science, Tsukuba, Japan
7. Tohoku University, Japan
8. 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

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
DISTRIBUTION FUNCTIONS
GLASS
HEATING
PLASTICS
STRAINS
TORSION
X-RAY DIFFRACTION