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Plate-like cell growth during directional solidification of a Zn-20wt%Sn high-temperature lead-free solder alloy

机译:Zn-20wt%Sn高温无铅焊料合金定向凝固过程中的板状细胞生长

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摘要

Although Zn-Sn alloys have suitable features for high temperature solders, as for example the absence of intermetallic compounds (IMCs) and relatively high melting temperatures, the control of the scale of the microstructure by adequate pre-programming of the solidification thermal parameters remains still a task to be accomplished. The present study focuses on the interrelation among hardness, microstructure features/segregation and solidification thermal parameters. An upward directional transient solidification apparatus was used in order to permit samples along a range of cooling rates to be obtained for such evaluation. The entire Zn-20wt%Sn alloy casting is characterized by a two-phase alternated structure, which resembles the morphology of a lamellar eutectic. Experimental growth laws having -1/2 and -1/4 exponents are proposed relating the interphase spacing to the growth rate and the cooling rate, respectively. The morphology and size of the Zn-rich plate-like cells, as well as the macrosegregation pattern are shown to affect the hardness.
机译:尽管Zn-Sn合金具有适用于高温焊料的特征,例如,不存在金属间化合物(IMC)和相对较高的熔化温度,但仍然可以通过对固化热参数进行适当的预编程来控制微观结构的规模要完成的任务。本研究着重于硬度,微观结构特征/偏析和凝固热参数之间的相互关系。为了允许沿冷却速率范围获得样品,使用向上方向的瞬态固化设备进行评估。整个Zn-20wt%Sn合金铸件的特征是两相交替结构,类似于层状共晶的形态。提出了具有-1/2和-1/4指数的实验生长定律,将相间间距分别与生长速率和冷却速率相关联。富锌板状细胞的形态和大小以及宏观偏析模式均会影响硬度。

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