Lu-Mg和Lu-Al合金热力学性质的理论分析  

Theoretical Analysis of Thermodynamic Properties of Lu-Mg and Lu-Al Alloys

作　　者：纪凡 何荧 向金秋 罗立平[1,2] JI Fan;HE Ying;XIANG Jin-qiu;LUO Li-ping(Research Institute of Physical and Chemical Engineering of Nuclear Industry,Tianjin 300180,China;National Key Labortory of Particle Transport and Separation Technology,Tianjin 300180,China)

机构地区：[1]核工业理化工程研究院,天津300180 [2]粒子输运与富集技术全国重点实验室,天津300180

出　　处：《世界有色金属》2024年第6期20-23,共4页World Nonferrous Metals

基　　金：粒子输运与富集技术全国重点实验室稳定支持项目(GZ-WZJC-2023-04)。

摘　　要：文章利用Miedema生成热模型计算Lu-Mg和Lu-Al二元合金的混合焓、过剩熵、过剩吉布斯自由能以及各组元的活度。结合Butler方程,计算Lu-Mg和Lu-Al合金熔体的表面张力以及表面相中各元素含量。研究结果表明,Lu-Mg和Lu-Al合金熔体的混合焓、过剩熵以及过剩吉布斯自由能都为负值,同时各组分活度较理想熔体有着一定负偏差,说明Lu与Mg和Al原子之间存在显著的相互作用力。Lu-Mg和Lu-Al合金熔体表面张力随Mg和Al含量的增加而减小,Mg和Al元素均会向熔体表面富集。The mixing enthalpy,excess entropy,excess Gibbs free energy and the activity among all components of Lu-Mg and Lu-Al binary alloy melts were calculated using the Miedema model.According to the Butler’s equation,the surface tensions of Lu-Mg and Lu-Al alloy melts and the content of all elements in the surface phase were calculated.The results indicate that the mixing enthalpy,excess entropy and excess Gibbs free energy of Lu-Mg and Lu-Al alloy melts are all negative.The activity of each component shows negative deviations compared to the ideal solution,indicating that Lu has stronger interaction with Mg and Al.The surface tensions of Lu-Mg and Lu-Al alloy melts decrease with the increase of Mg and Al content.Both Mg and Al elements are enriched towards the melt surface.

关 键 词：MIEDEMA模型 Butler方程 活度 表面张力 Lu-Mg Lu-Al 

分 类 号：TG146.45[一般工业技术—材料科学与工程]