Abstract
A novel hexagonal Mg2Sn strengthening precipitate has been achieved by high pressure aging (2GPa, 400°C) method in a Mg–9wt% Sn alloy for the first time. The results show the particle is ellipsoid-shaped with an average diameter of 25nm. Differing from the conventional coarse plate-like or rod-like Mg2Sn strengthening particles with face-centered cubic structure after artificial aging at ~200°C, the formation of novel fine hexagonal Mg2Sn particles significantly improves the strength of Mg–Sn alloys together with the ductility. The high strength and ductility are mainly associated with the presence of fine strengthening precipitates and the low lattice misfit (0.025) of hexagon-on-hexagon crystallographic orientation, respectively.
Published Version
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