A combined 3D investigation of elemental distribution and tensile fracture behaviour was carried out using synchrotron x-ray micro-tomography and absorption edge tomography for two near eutectic cast Al-Si-Cu-Ni alloys. Absorption edge tomography allowed the identification of intermetallics three-dimensionally based on the Cu/Ni distribution and morphology of the phases. In addition, inhomogeneities in the distributions, especially on the surface of intermetallics, were revealed by this technique. A correlation of the post-mortem state with the 3D Cu and Ni distributions showed that the main crack tends to propagate along interfaces between different types of intermetallics, while local inhomogeneities in element distribution within intermetallics acted as crack deflection sites.

中文翻译：

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相关同步加速器吸收边断层扫描和显微断层扫描可深入了解金属间相内的元素分布对铸造铝硅合金断裂行为的影响

使用同步加速器 X 射线显微断层扫描和吸收边断层扫描对两种近共晶铸造 Al-Si-Cu-Ni 合金进行元素分布和拉伸断裂行为的联合 3D 研究。吸收边断层扫描可以根据 Cu/Ni 分布和相的形态来三维识别金属间化合物。此外，该技术还揭示了分布的不均匀性，特别是金属间化合物表面的不均匀性。事后状态与 3D Cu 和 Ni 分布的相关性表明，主裂纹倾向于沿着不同类型金属间化合物之间的界面扩展，而金属间化合物内元素分布的局部不均匀性充当裂纹偏转位点。