Developing high-strength and ductile Mg-Gd-Y-Zn-Zr alloy sheet via bimodal grain structure coupling with heterogeneously-distributed precipitates

Achieving high strength-ductility synergy in hard-to-deform high-alloyed Mg-Gd-Y-Zn-Zr alloys by rolling remains a great challenge. In this work, a Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy sheet pos-sessing a high yield strength (YS) of similar to 385 MPa, ultimate tensile strength (UTS) of similar to 420 MPa and elongation of similar to 19% was achieved via a single-pass hard-plate rolling (HPR) process. The high YS is mainly from amounts of submicron FGs and strong interactions between densely distributed ?' precipitates and pyramidal < c + a > dislocations in CGs. The activation of multiple slip systems, HDI-hardening effect, and crack suppression effect from ?' particles, endow the excellent ductility.