Recovery of less relaxed state in Zr-Al-Ni-Cu bulk metallic glass annealed above glass transition temperature

Junji Saida; Rui Yamada; Masato Wakeda

doi:10.1063/1.4835076

Recovery of less relaxed state in Zr-Al-Ni-Cu bulk metallic glass annealed above glass transition temperature

Junji Saida, Rui Yamada, Masato Wakeda

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

The relaxation state of metallic glass is determined by the cooling rate at low temperatures in a supercooled liquid. Based on this result, we can control the relaxation state of Zr₅₅Al₁₀Ni₅Cu ₃₀ bulk metallic glass by recovery annealing just above the glass transition temperature (T_g). We rejuvenate the relaxation state for approximately 50% in the enthalpy of relaxation at a cooling rate of 4.4 K/s after annealing, as compared with that of the as-cast state. Mechanical softening also occurred upon the rejuvenation. The results suggest another method of controlling the structure of metallic glasses to improve their properties.

Original language	English
Article number	221910
Journal	Applied Physics Letters
Volume	103
Issue number	22
DOIs	https://doi.org/10.1063/1.4835076
Publication status	Published - 2013 Nov 25

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "The relaxation state of metallic glass is determined by the cooling rate at low temperatures in a supercooled liquid. Based on this result, we can control the relaxation state of Zr55Al10Ni5Cu 30 bulk metallic glass by recovery annealing just above the glass transition temperature (Tg). We rejuvenate the relaxation state for approximately 50% in the enthalpy of relaxation at a cooling rate of 4.4 K/s after annealing, as compared with that of the as-cast state. Mechanical softening also occurred upon the rejuvenation. The results suggest another method of controlling the structure of metallic glasses to improve their properties.",

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AU - Saida, Junji

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AU - Wakeda, Masato

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Y1 - 2013/11/25

N2 - The relaxation state of metallic glass is determined by the cooling rate at low temperatures in a supercooled liquid. Based on this result, we can control the relaxation state of Zr55Al10Ni5Cu 30 bulk metallic glass by recovery annealing just above the glass transition temperature (Tg). We rejuvenate the relaxation state for approximately 50% in the enthalpy of relaxation at a cooling rate of 4.4 K/s after annealing, as compared with that of the as-cast state. Mechanical softening also occurred upon the rejuvenation. The results suggest another method of controlling the structure of metallic glasses to improve their properties.

AB - The relaxation state of metallic glass is determined by the cooling rate at low temperatures in a supercooled liquid. Based on this result, we can control the relaxation state of Zr55Al10Ni5Cu 30 bulk metallic glass by recovery annealing just above the glass transition temperature (Tg). We rejuvenate the relaxation state for approximately 50% in the enthalpy of relaxation at a cooling rate of 4.4 K/s after annealing, as compared with that of the as-cast state. Mechanical softening also occurred upon the rejuvenation. The results suggest another method of controlling the structure of metallic glasses to improve their properties.

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