Development of low-alloyed Mg-Zn-Ca-Sn-Mn alloy with high strength-ductility synergy by sub-rapid solidification and hot rolling

Achieving high strength-ductility synergy is a great challenge in low-alloyed Mg alloys. In this work, a new Mg-1.0Zn-0.45Ca-0.35Sn-0.2Mn (wt.%, ZXTM1000) alloy was designed and fabricated by subrapid solidification (SRS) to overcome the dilemma. After hot rolling and annealing, the new alloy sheet exhibited an excellent tensile yield strength (YS, similar to 270 MPa) and elongation (similar to 21%). Microstructure characterization revealed that the high YS was mainly attributed to the fine grains (similar to 3 mu m) and high density of spherical Ca2Mg6Zn3, Mg2Ca, and alpha-Mn precipitates. Moreover, the homogeneous grain size distribution, weakened TD-split texture and the activation of multiple types of slips contributed to the enhanced ductility. The findings demonstrate an effective way to fabricate low-alloyed Mg alloys with high strength and ductility by combining the SRS and hot rolling. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

A new low-alloyed Mg alloy with high strength and ductility was successfully fabricated by combining subrapid solidification and hot rolling techniques.