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The effect of grain boundary characteristics on the crystal/melt interface morphology during the unidirectional solidification of multicrystalline Si was studied by in situ observations. It was shown that sharp and smooth grooves were formed at the crystal/melt interfaces at Σ27 and random grain boundaries, whereas no grooves were formed at Σ3 {111} twin boundaries. We explain the reasons why the...
An unprecedented uniform distribution and dispersion of 6vol.% SiC nanoparticles (NPs) in Mg–Zn matrix is obtained through a novel solidification processing method that combines semisolid-state mechanical mixing and liquid-state ultrasonic processing. The resulting Mg-based metal matrix nanocomposites (MMNCs) exhibit the highest hardness and the greatest hardness enhancement among all crystalline...
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