Mechanical relaxations of a (Zr77.5Ti22.5)55(Ni48Cu52)21.25Be23.75 amorphous alloy studied using dynamic mechanical analysis |
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| Authors: | H T Jeong E Fleury W T Kim and D H Kim |
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| Affiliation: | (1) BK21 Division of Humantronics Information Materials, Yonsei University, 134, Sinchon-dong, Seodaemun-gu, 120-749 Seoul, Korea;(2) Advanced Metals Research Center, Korea Institute of Science and Technology, 39-1, Hawolgok 2-dong, Seongbuk-gu, 130-650 Seoul, Korea;(3) Applied Science Division, Chungju University, Naedeok 2-dong, Sangdang-gu, Cheongju-si, 360-764 Chungbuk, Korea;(4) Department of Metallurgical Engineering, Yonsei University, 134, Sinchon-dong, Seodaemun-gu, 120-749 Seoul, Korea |
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| Abstract: | The dynamic mechanical properties of a (Zr77.5Ti22.5)55(Ni48Cu52)21.25Be23.75 amorphous alloy were investigated by frequency-dependent elastic moduli and isothermal multi-frequency measurements. The
frequency-dependent loss modulus showed a relaxation behavior resulting from a glass transition, and the variation of the
peak frequency was related to the Arrhenius equation. Isothermal multi-frequency measurement data were used to construct the
master curves of the elastic moduli and tan δ by applying the time-temperature superposition principle. The temperature dependence
of the shift factor was found to follow the Arrhenius relationship, and the activation energies for the low temperature relaxation
and glass transition were approximately 156.6kJ/mol and 554kJ/mol, respectively. The glass transition temperature (T
g) was manifested by the crossover region of the shift factor dependence, and from the relationship between the shift factors
and the temperature aboveT
g), the fragility index of this alloy was estimated. |
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| Keywords: | dynamic mechanical analysis time-temperature superposition (TTS) principle amorphous alloy mechanical relaxation fragility index |
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