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

Journal Article · Sat Apr 25 00:00:00 EDT 2015 · Materials Transactions

DOI:https://doi.org/10.2320/matertrans.M2015023· OSTI ID:1185652

Haruyama, Osami ^[1]; Yoshikawa, Kazuyoshi ^[2]; Yamazaki, Yoshikatsu ^[2]; Yokoyama, Yoshihiko ^[3]; Egami, Takeshi ^[4]

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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

In this paper, the α-relaxation of pre-annealed Zr₅₅Cu₃₀Ni₅Al₁₀ bulk metallic glasses (BMGs) was compared with that of as-cast Zr-based BMGs including Zr₅₅Cu₃₀Ni₅Al₁₀. 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); Tohoku Univ. (Japan)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1185652
• Journal Information: Materials Transactions, Vol. 56, Issue 5; ISSN 1345-9678
• Publisher: Japan Institute of Metals and Materials
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
zirconium-based bulk metallic glasses
α-relaxation
volume relaxation
static relaxation analysis