Phase formation and thermodynamics of unstable Cu–Cr alloys
Phase formation and thermodynamics of unstable Cu–Cr alloys
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DOI：
10.1557/jmr.1997.0201
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发表时间：
1997-06
影响因子：
2.7
通讯作者：
C. Michaelsen;C. Gente;R. Bormann
中科院分区：
文献类型：
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作者：
C. Michaelsen;C. Gente;R. Bormann
制备亚稳相和不稳定相的高度非平衡过程的定量描述需要确定所研究系统的热力学函数。然而，在系统中，如铜-铬是不混溶的平衡状态，在整个浓度范围内的热力学函数的测定往往是困难的，如果不是不可能的，因为可靠的实验数据是不可用的亚稳或不稳定的制度。本文表明，这样的数据可以通过薄膜沉积技术和差示扫描量热法的组合获得。它的结论是，在这样的薄膜中的相形成可以描述在系统的热力学方面，即使当混合热是高度积极的。结果表明，规则溶液型模型仍然提供了合理的描述这类合金的热力学函数。
The quantitative description of highly nonequilibrium processes for the preparation of metastable and unstable phases requires the determination of the thermodynamic functions of the system under investigation. However, in systems such as Cu–Cr which are immiscible in the equilibrium states, the determination of the thermodynamic functions over the entire concentration range is often difficult if not impossible because reliable experimental data are not available for the metastable or unstable regime. The present paper demonstrates that such data can be obtained by a combination of thin film deposition techniques and differential scanning calorimetry. It is concluded that the phase formation in such thin films can be described in terms of the thermodynamics of the system, even when the heats of mixing are highly positive. The results indicate that models of the regular solution type still provide a reasonable description of the thermodynamic functions of such alloys.