Phase equilibria and the related properties of Sn-Ag-Cu based Pb-free solder alloys
Phase equilibria and the related properties of Sn-Ag-Cu based Pb-free solder alloys
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DOI：
10.1007/s11664-000-0004-9
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发表时间：
2000-10
影响因子：
2.1
通讯作者：
I. Ohnuma;Masamitsu Miyashita;K. Anzai;X. J. Liu;H. Ohtani;R. Kainuma;K. Ishida
中科院分区：
文献类型：
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作者：
I. Ohnuma;Masamitsu Miyashita;K. Anzai;X. J. Liu;H. Ohtani;R. Kainuma;K. Ishida
我们最近开发了一个微型焊接合金的热力学数据库，其中包括元素铅、铋、锡、锑、铜、银、锌和铟。本文利用该数据库计算了锡-银-铜基合金的相平衡和相关的热力学性质，认为合金系是最有希望的无铅焊料之一。用扫描电子显微镜-能谱仪、X射线衍射仪和金相技术实验测定了锡-银-铜三元系的等温断面图。在此基础上，结合已有的相界数据和热化学性质数据，对该体系进行了热力学评价。计算了等温图、垂直图、液相线表面、相组成的质量分数等。对表面能和粘度的预测也进行了探讨。利用Scheil模型对非平衡凝固过程进行了数值模拟，并与某些合金的平衡凝固行为进行了比较。基于Scheil模型的计算结果被结合到三维凝固模拟中，并对实际凝固过程进行了预测。
We have recently developed a thermodynamic database for micro-soldering alloys which consists of the elements Pb, Bi, Sn, Sb, Cu, Ag, Zn, and In. In this paper, the phase equilibria and the related thermodynamic properties of the Sn-Ag-Cu base alloys are presented using this database, alloy systems being one of the promising candidates for Pb-free solders. The isothermal section diagrams of the Sn-Ag-Cu ternary system were experimentally determined by SEM-EDS, x-ray diffraction and metallographic techniques. Based on the present results as well as the previous data on phase boundaries and thermochemical properties, thermodynamic assessment of this system was carried out. The isothermal and vertical section diagrams, liquidus surface, mass fractions of the phase constitution, etc., were calculated. The predictions of surface energy and viscosity were also investigated. Moreover, a non-equilibrium solidification process using the Scheil model was simulated and compared with the equilibrium solidification behavior in some Sn-Ag-Cu base alloys. Calculated results based on the Scheil model were incorporated into a three-dimensional solidification simulation and the prediction of practical solidification procedures was performed.