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Title: Structural rejuvenation in bulk metallic glasses

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  1. (Tennessee-K)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
OSTI Identifier:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Mater.; Journal Volume: 86; Journal Issue: 03, 2015
Country of Publication:
United States

Citation Formats

Tong, Y., Iwashita, T., Dmowski, W., Bei, H., Yokoyama, Y., Egami, T., Tohoku), and ORNL). Structural rejuvenation in bulk metallic glasses. United States: N. p., 2015. Web. doi:10.1016/j.actamat.2014.12.020.
Tong, Y., Iwashita, T., Dmowski, W., Bei, H., Yokoyama, Y., Egami, T., Tohoku), & ORNL). Structural rejuvenation in bulk metallic glasses. United States. doi:10.1016/j.actamat.2014.12.020.
Tong, Y., Iwashita, T., Dmowski, W., Bei, H., Yokoyama, Y., Egami, T., Tohoku), and ORNL). 2015. "Structural rejuvenation in bulk metallic glasses". United States. doi:10.1016/j.actamat.2014.12.020.
title = {Structural rejuvenation in bulk metallic glasses},
author = {Tong, Y. and Iwashita, T. and Dmowski, W. and Bei, H. and Yokoyama, Y. and Egami, T. and Tohoku) and ORNL)},
abstractNote = {},
doi = {10.1016/j.actamat.2014.12.020},
journal = {Acta Mater.},
number = 03, 2015,
volume = 86,
place = {United States},
year = 2015,
month = 3
  • Using high-energy X-ray diffraction we study structural changes in bulk metallic glasses after uniaxial compressive homogeneous deformation at temperatures slightly below the glass transition. We observe that deformation results in structural disordering corresponding to an increase in the fictive, or effective, temperature. However, the structural disordering saturates after yielding. Lastly, examination of the experimental structure and molecular dynamics simulation suggests that local changes in the atomic connectivity network are the main driving force of the structural rejuvenation.
  • 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 wellmore » be an outcome of local heating due to deformation and may not directly provide the knowledge of the atomistic mechanism of strain localization.« less
  • High-pressure x-ray diffraction studies have been carried out on the two group IV transition metals-based bulk metallic glasses (BMGs) Zr{sub 57}Cu{sub 15.4}Ni{sub 12.6}Al{sub 10}Nb{sub 5} and Ti{sub 42}Zr{sub 24}Cu{sub 15.5}Ni{sub 14.5}Be{sub 4} to a pressure of 30 GPa at ambient temperature in a diamond anvil cell. Image plate x-ray diffraction studies under high pressure were carried out at a synchrotron source and the two BMG diffraction bands can be followed to the highest pressure using an internal copper pressure standard. The amorphous phase is observed to be stable to the highest static pressure of 30 GPa suggesting that the phasemore » change observed in dynamical pressure experiments is related to an increase in temperature. The measured bulk modulus (B{sub 0}) and its pressure derivative (B') are 118 GPa and 3.11 for Zr-based BMG and 116 GPa and 2.84 for Ti-based BMG. The measured bulk modulus for BMG's by x-ray diffraction technique is consistent with the ultrasonic measurements. The decompression data reveal an increase in density by 3%-4% at ambient condition after pressure cycling to 30 GPa indicating reduction in excess free volume.« less