R. N. Abdullaev, A. Sh. Agazhanov, R. A. Khairulin, Yu. M. Kozlovskii, D. A. Samoshkin, S. V. Stankus
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引用次数: 0
Abstract
A homogeneous eutectic alloy of the magnesium-lithium-calcium ternary system containing 72.5 at.% magnesium, 19.1 at.% lithium, and 8.4 at.% calcium was prepared. Experimental studies of the relative elongation, density, thermal expansion, heat capacity, thermal diffusivity and thermal conductivity of this ultralight alloy were performed in the temperature range of 120 K to 710 K. The behavior of density and thermal expansion in the melting-crystallization region and in the liquid state was also studied. A comparison with previously obtained results on the thermophysical properties of pure magnesium and magnesium-lithium, magnesium-calcium eutectic alloys was made. The temperature dependences were constructed and the table of the investigated properties recommended values were presented. It was found that in the Mg–Li–Ca alloy a phase transition occurs in the range of 225 K to 245 K, where the heat capacity and the linear thermal expansion coefficient change abruptly. This kind of transition was found earlier in the study of the Mg–Li eutectic alloy and is presumably related to the martensitic transformation of the lithium-rich bcc magnesium-lithium alloys to the hcp structure.
摘要 制备了含 72.5%镁、19.1%锂和 8.4%钙的镁-锂-钙三元均匀共晶合金。实验研究了这种超轻合金在 120 K 至 710 K 温度范围内的相对伸长率、密度、热膨胀、热容量、热扩散率和热导率。与之前获得的纯镁和镁-锂、镁-钙共晶合金的热物理性质结果进行了比较。构建了温度依赖关系，并提供了所研究特性的推荐值表。研究发现，镁-锂-钙合金在 225 K 至 245 K 范围内发生了相变，热容量和线性热膨胀系数发生了突变。这种转变早在镁锂共晶合金研究中就已发现，可能与富锂 bcc 镁锂合金向 hcp 结构的马氏体转变有关。
期刊介绍：
Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.
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