固态和液态镁及镁锂合金的密度

来源期刊:中国有色金属学报(英文版)2019年第3期

论文作者:R. N. ABDULLAEV R. A. KHAIRULIN Yu. M. KOZLOVSKII A. Sh. AGAZHANOV S. V. STANKUS

文章页码:507 - 514

关键词:密度;熔体;固体;镁;镁锂合金;热膨胀;互扩散

Key words:density; melt; solid; magnesium; magnesium-lithium alloys; thermal expansion; interdiffusion

摘    要:给出关于固体和液态的镁以及含23.03 at.%和30.02 at.% Li的超轻镁锂合金的密度和热膨胀率的新实验数据。采用膨胀计法和伽马射线衰减技术进行测量,测量的温度范围对于镁为145~1244 K,对于镁锂合金为293~1000 K。直接测量Mg和Mg70Li30合金在固-液相变时的密度变化,建立体积性质与温度的关系和参考表。将所得结果与文献数据进行比较,结果表明,镁锂体系中的共晶成分不是23 at.% Li。研究发现,在0~30 at.% Li范围内,液态镁锂体系的摩尔体积与浓度几乎呈线性关系,和理想混合物的明显不同。

Abstract: New experimental data are presented on the density and thermal expansion of solid and liquid magnesium and ultralight magnesium–lithium alloys containing 23.03 and 30.02 at.% Li, respectively. The measurements were performed using the dilatometer method and the gamma-ray attenuation technique in the temperature range from 145 to 1244 K for magnesium and from 293 to ~1000 K for the alloys. The density changes during the solid-liquid phase transition were directly measured for Mg and the Mg70Li30 alloy. The temperature dependences and reference tables of the investigated volumetric properties were developed. A comparison of the obtained results with literature data was made. The study showed that the eutectic composition in the magnesium- lithium system differs from 23 at.% Li. The concentration dependence of molar volume of the magnesium-lithium liquid system was found to be almost linear in the interval of 0-30 at.% Li and deviated noticeably from the corresponding dependence for an ideal mixture.

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