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Title: Comparison of Structural Relaxation Behavior in As-Cast and Pre-Annealed Zr-Based Bulk Metallic Glasses Just below Glass Transition

In this paper, the α-relaxation of pre-annealed Zr 55Cu 30Ni 5Al 10 bulk metallic glasses (BMGs) was compared with that of as-cast Zr-based BMGs including Zr 55Cu 30Ni 5Al 10. The α-relaxation was investigated by volume relaxation. The relaxation behavior was well described by a stretched exponential relaxation function, Φ (t) ≈ exp [ - (t/τ α ) β α ], with the isothermal relaxation time, τ α, and the Kohlrausch exponent, β α. The β α exhibited the strong temperature dependence for the pre-annealed BMG, while the weak temperature dependence was visualized for the as-cast BMG similar to the dynamic relaxation. The τ α’s were modified by Moynihan and Narayanaswamy-Tool-Moynihan methods that reduce the difference in the thermal history of sample. Finally, as a result, the relaxation kinetics in the glass resembled that of a liquid deduced from the behavior of viscosity in the supercooled liquid.
 [1] ;  [2] ;  [2] ;  [3] ;  [4]
  1. Tokyo Univ. of Science (Japan). Organization for Advanced Education
  2. Tokyo Univ. of Science (Japan). Educational School of Science and Technology
  3. Tohoku Univ., Sendai (Japan). Inst. for Materials Research
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Material Science and Engineering; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Materials Transactions
Additional Journal Information:
Journal Volume: 56; Journal Issue: 5; Journal ID: ISSN 1345-9678
Japan Institute of Metals and Materials
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Tohoku Univ. (Japan)
Country of Publication:
United States
36 MATERIALS SCIENCE; zirconium-based bulk metallic glasses; α-relaxation; volume relaxation; static relaxation analysis