过冷
材料科学
过热(电)
共晶体系
铟
镓
等温过程
合金
热力学
热的
冶金
动能
定向凝固
微观结构
共金键结
物理
量子力学
作者
В. Д. Александров,S. A. Frolova
出处
期刊:Russian Metallurgy
[Springer Nature]
日期:2021-03-01
卷期号:2021 (3): 308-312
被引量:2
标识
DOI:10.1134/s0036029521030022
摘要
The influence of the overheating of the Ga–14.2 mol % In eutectic alloy melt on the presolidification cooling is studied on 2-g samples by cyclic thermal analysis. In the case of the overheating of the liquid eutectic above the eutectic temperature Te = 288.3 by 28–30 K and subsequent cooling, the overheating dependence of the supercooling has a continuously increasing character. The limiting supercooling is ~25 K regardless of the preliminary overheating of the melt, from 30 to 100 K. The solidification from the supercooled state is found to have an “explosive” character at a rate of 40–45 K/s. The supercooling is not affected by long-term (for several hours) isothermal holding of the melt in overheated and supercooled states. The kinetic and thermodynamic parameters of the eutectic solidification are calculated using fusibility thermograms.
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