Thermodynamics of aluminium-strontium alloys
Thermodynamics of aluminium-strontium alloys
复制标题
铝锶合金的热力学
DOI：
10.1007/s11629-020-6573-6
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
K. Jacob
中科院分区：
文献类型：
--
作者：
S. Srikanth;K. Jacob
在1323 K时，用Knudsen渗液-质量损失法测定了液态Al-Sr合金（X（Sr）小于或等于0.17）中锶的活度。在较高的浓度下（X（Sr）大于或等于0.28），锶的活度用假等静技术测定。铝的活度是由吉布斯-迪昂积分法得到的。利用热力学数据计算了Bhatia和Thornton在零波矢量处的浓度-浓度结构因子。成分的均方热波动和热力学混合函数的行为表明了液相中的关联趋势。以Al2Sr为主要络合物的伴生溶液模型可以解释液态合金的性能。利用相图和液相合金的吉布斯能量和混合焓，导出了Al-Sr体系中金属间化合物的热力学数据。数据表明需要重新测定富锶角附近的相图。
The activity of strontium in liquid Al-Sr alloys (X(Sr) less-than-or-equal-to 0.17) at 1323 K has been determined using the Knudsen effusion-mass loss technique. At higher concentrations (X(Sr) greater-than-or-equal-to 0.28), the activity of strontium has been determined by the pseudoisopiestic technique. Activity of aluminium has been derived by Gibbs-Duhem integration. The concentration - concentration structure factor of Bhatia and Thornton at zero wave vector has been computed from the thermodynamic data. The behaviour of the mean square thermal fluctuation in composition and the thermodynamic mixing functions suggest association tendencies in the liquid state. The associated solution model with Al2Sr as the predominant complex can account for the properties of the liquid alloy. Thermodynamic data for the intermetallic compunds in the Al-Sr system have been derived using the phase diagram and the Gibbs' energy and enthalpy of mixing of liquid alloys. The data indicate the need for redetermination of the phase diagram near the strontium-rich corner.