Microstructural features of Sc- and Zr-modified Al-Mg alloys processed by selective laser melting

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Effect of laser rescanning on the grain microstructure of a selective laser melted Al-Mg-Zr alloy (2018, background): “[16] for their Al-Sc-Zr-based alloy, who also identified primary Al3(Sc,Zr) precipitates as nucleant for their fine-grain Al regions deep in the melt pool, and the suppression of primary precipitation as the reason for the columnar grain regions near the melt pool surface.”
Additive manufacturing of high-strength crack-free Ni-based Hastelloy X superalloy (2019, background): “heterogeneous microstructure [37][42][43][44], where epitaxial columnar grains had formed along the build direction (Fig.”