A new method for measuring the thermodynamic properties of undercooled liquid and amorphous Cu-Zr alloys

被引：16
|
作者：
Wang, Tao [1 ]
Cullinan, T. E. [2 ]
Napolitano, R. E. [1 ,2 ]
机构：
[1] US DOE, Ames Lab, Div Mat Sci & Engn, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
来源：
ACTA MATERIALIA | 2014年 / 62卷
关键词：
Undercooled liquid; Heat capacity measurement; Cu-Zr; Glass-forming alloys; Thermodynamics; GLASS-TRANSITION; ELECTROSTATIC LEVITATION; THERMOPHYSICAL PROPERTIES; PHASE-EQUILIBRIA; SYSTEM; MELTS; HEAT; TEMPERATURE; ENTHALPY; SI;
D O I：
10.1016/j.actamat.2013.09.047
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new method for the experimental determination of the temperature-dependent heat capacity is presented here. The value of this new method lies principally in its applicability to unstable systems, where time-dependent relaxation processes limit the utility of conventional stepwise methods that employ a series of isothermal holding periods. The method is demonstrated for two glass-forming alloys (Cu50Zr50 and Cu64.5Zr35.5), using differential scanning calorimetry (DSC) measurements over a (low) temperature regime including stable, metastable and unstable states (crystalline, glass and undercooled liquid). For this specific analysis, the glassy material is heated using several different rates, each resulting in a different transformation temperature. After characterization of the final states, analysis of the DSC traces yields the requisite transition enthalpies, enabling determination of the heat capacities, based on common reference states. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：188 / 196
页数：9
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