Siroky Georg, Kraker Elke, Rosc Jördis, Kieslinger Dietmar, Brunner Roland, van der Zwaag Sybrand, Kozeschnik Ernst, Ecker Werner
Materials Center Leoben Forschung GmbH (MCL), Roseggerstraße 12, 8700 Leoben, Austria.
ZKW Elektronik GmbH, Samuel Morse-Straße 18, 2700 Wiener Neustadt, Austria.
Materials (Basel). 2020 Dec 31;14(1):153. doi: 10.3390/ma14010153.
This work provides an analysis of X-ray micro computed tomography data of Sn-xBi solders with x = 20, 30, 35, 47, 58 wt.% Bi. The eutectic thickness, fraction of eutectic and primary phase are analyzed. Furthermore, the 3D data is evaluated by means of morphology parameters, such as, shape complexity, flatness, elongation and mean intercept length tensor. The investigated alloys are categorized in three groups based on their morphology, which are described as "complex dominant", "complex- equiaxed" and "mixed". The mechanical behavior of Sn-Bi alloys in the semi-solid configuration and the correlation with microstructural parameters are discussed. A varying degree of geometric anisotropy of the investigated alloys is found through the mean intercept length tensor. Representative volume element models for finite element simulations (RVE-FEM) are created from tomography data of each alloy to analyze a correlation of geometric and elastic anisotropy. The simulations reveal an elastic isotropic behavior due to the small difference of elastic constants of primary and eutectic phase. A discussion of properties in the semi-solid state and liquid phase healing is provided.
这项工作对铋含量（x）分别为20%、30%、35%、47%、58%（重量百分比）的Sn-xBi焊料的X射线显微计算机断层扫描数据进行了分析。分析了共晶厚度、共晶相和初生相的比例。此外，通过形态学参数对三维数据进行评估，这些参数包括形状复杂度、平整度、伸长率和平均截距长度张量。根据其形态，将所研究的合金分为三组，分别描述为“复杂主导型”、“复杂等轴型”和“混合型”。讨论了Sn-Bi合金在半固态状态下的力学行为及其与微观结构参数的相关性。通过平均截距长度张量发现所研究合金存在不同程度的几何各向异性。根据每种合金的断层扫描数据创建了用于有限元模拟的代表性体积单元模型（RVE-FEM），以分析几何各向异性和弹性各向异性之间的相关性。模拟结果表明，由于初生相和共晶相的弹性常数差异较小，呈现出弹性各向同性行为。还对半固态状态下的性能和液相愈合进行了讨论。
