Thermodynamics, kinetics, and crystallization of Pt57.3Cu14.6Ni5.3P22.8 bulk metallic glass
Thermodynamics, kinetics, and crystallization of Pt57.3Cu14.6Ni5.3P22.8 bulk metallic glass
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DOI：
10.1016/j.actamat.2006.09.024
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发表时间：
2007-02-01
期刊：
影响因子：
9.4
通讯作者：
Busch, Ralf
中科院分区：
文献类型：
--
作者：
Legg, Benjamin A.;Schroers, Jan;Busch, Ralf
用差示扫描量热法(DSC)研究了块体金属非晶形成合金Pt57.3Cu14.6Ni5.3P22.8的热力学、动力学和晶化过程。测量了合金在晶态、玻璃态和过冷液相的热容。利用玻璃化转变对升温速率的依赖关系来计算动力学脆性。在等温条件下测定了结晶动力学，并用其建立了时间-温度-转变(TTT)图。实验测定的晶化动力学符合计算晶化活化能。我们的结果表明，Pt57.3Cu14.6M5.3P22.8既不是热力学的，也不是动力学稳定的玻璃形体。在讨论中还考虑了其他贡献，包括晶化激活能和助熔剂的使用，以解释该合金良好的玻璃可成形性。@2006 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
We report on differential scanning calorimetry (DSC) studies to characterize the thermodynamics, kinetics and crystallization processes of the bulk metallic glass-forming alloy Pt57.3Cu14.6Ni5.3P22.8. The heat capacity of the alloy is measured for the crystalline, glassy and supercooled liquid phases. The heating rate dependence of the glass transition is used to calculate the kinetic fragility. Crystallization kinetics are determined under isothermal conditions and used to construct a time-temperature-transformation (TTT) diagram. The experimentally determined crystallization kinetics are fit to calculate the activation energy for crystallization. Our results suggest that Pt57.3Cu14.6M5.3P22.8 is neither a thermodynamically nor a kinetically stabilized glass former. Other contributions, including the activation energy for crystallization and the use of a flux are considered in the discussion to explain the good glass formability of this alloy. @ 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.