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A high-strength Mg-Gd-Zn-Zr alloy developed by a novel extrusion method called differential-thermal extrusion (DTE) was detailed characterized, to reveal the effects of the DTE on microstructure and mechanical properties. Different from traditional isothermal extrusion (ITE) with the same billet and mold temperature, the billet temperature for the DTE is remarkably higher than the mold temperature...
1wt.% Zn addition introduced additional basal γ′ precipitates to the Mg-15Gd-0.4Zr (wt.%) alloy. Based on the detailed analysis of the precipitates and tensile properties evolution of the alloys, the composite β′ and γ′ precipitates provided much stronger strengthening effects than the only β′ precipitates, even when the latter one had higher number density. The results imply that even a few γ′ precipitates...
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