Thermodynamics and kinetics of the Mg65Cu25Y10 bulk metallic glass forming liquid
Thermodynamics and kinetics of the Mg65Cu25Y10 bulk metallic glass forming liquid
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DOI：
10.1063/1.367167
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发表时间：
1998-04-15
影响因子：
3.2
通讯作者：
Johnson, WL
中科院分区：
文献类型：
--
作者：
Busch, R;Liu, W;Johnson, WL
采用差示扫描量热法和三点束弯曲法研究了Mg65Cu25Y10液相体金属玻璃成形的热力学和动力学。通过实验确定了过冷液体的热力学函数和粘度。粘度表现出温度依赖性，这与类似于Zr-Ti-Cu-Ni-Be大块金属玻璃或硅酸钠玻璃的强玻璃的粘度一致。这与更脆弱的传统金属玻璃成型或纯金属形成对比。过冷液热力学函数相对弱的温度依赖性与过冷液中这些缓慢的动力学有关。在脆性概念和Adam-Gibbs理论的框架下，对熵、粘度和动力学玻璃化转变进行了比较。强液体行为在动力学和热力学上阻碍了晶体的形成。(C) 1998美国物理研究所。
The thermodynamics and kinetics of the bulk metallic glass forming Mg65Cu25Y10 liquid were investigated using differential scanning calorimetry and three-point beam bending. The experiments lead to the determination of the thermodynamic functions as well as the viscosity of the supercooled liquid. The viscosity shows a temperature dependence, which is consistent with that of a strong glass similar to Zr-Ti-Cu-Ni-Be bulk metallic glasses or sodium silicate glasses. This contrasts with more fragile conventional metallic glass formers or pure metals. The relatively weak temperature dependence of the thermodynamic functions of the supercooled liquid is related to these sluggish kinetics in the supercooled liquid. Entropy, viscosity, and kinetic glass transition are compared in the frameworks of the fragility concept and the Adam-Gibbs theory. Strong liquid behavior retards the formation of crystals kinetically and thermodynamically. (C) 1998 American Institute of Physics.