Three mechanical relaxation modes associated with nanoscale structural heterogeneity in Pd42.5Ni7.5Cu30P20 fragile glass

被引：2
|
作者：
Wang, Hao [1 ]
Ichitsubo, Tetsu [1 ]
Kato, Hidemi [1 ]
机构：
[1] Tohoku Univ, Inst Mat Res, Sendai 9808577, Japan
来源：
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS | 2023年 / 98卷
关键词：
INTERNAL-FRICTION; BETA-RELAXATION; TRANSITION; VISCOELASTICITY; LA55AL25NI20; TEMPERATURE; DEPENDENCE;
D O I：
10.1051/epjap/2022220266
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The dynamic relaxation behavior of Pd42.5Ni7.5Cu30P20 metallic glass was studied at 173-563 K (similar to 0.98T(g)) and at angular frequency 10(-2) to 10(2) rad s(-1). Master curves of 16-digit dynamic moduli at angular frequency 10(-4) - 10(12) rad s(-1) were constructed and characterized by the stretched exponent relaxation function, which exhibits three discrete relaxation modes with different activation energies, i.e., alpha-relaxation (7.98 eV) associated with the cooperative motion of similar to 5 atoms, slow beta-relaxation (1.39 eV) associated with single atomic diffusion, and fast beta-relaxation (0.25 eV) associated with rattling motion. These three modes were also detected as slope changes on the quasi-static creep compliance under an isochronal heating process, which was successfully reproduced by dynamic complex compliance using the dynamic moduli with fitting parameters related to the considerable inhomogeneous structural characteristics, elastic modulus and volume fraction, generated in the glass.
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页数：8
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