Mechanical properties of warm-extruded Mg-Zn-Gd alloy with coherent 14H long periodic stacking ordered structure precipitate

Heat treatment produces the coherent precipitation of a 14H-type long period ordered (LPO) structure from a supersaturated α′-Mg matrix in Mg-Zn-Gd. Warm-extruded Mg96.5Zn1Gd2.5 (at.%) alloys with an LPO structure exhibited high tensile yield strength (345 MPa) and large elongation (6.9%), due to the refinement of α-Mg grains and the high dispersion of a hard LPO structure phase.