TY  - JOUR
AU  - Fan, Mingyu
AU  - Cui, Ye
AU  - Zhang, Yang
AU  - Wei, Xinghao
AU  - Cao, Xue
AU  - Liaw, Peter K.
AU  - Yang, Yuansheng
AU  - Zhang, Zhongwu
PY  - 2023
TI  - Achieving high strength-ductility synergy in a Mg97Y1Zn1Ho1 alloy via a nano-spaced long-period stacking-ordered phase
JO  - Journal of Magnesium and Alloys
SN  - 2213-9567
SP  - 1321
EP  - 1331
VL  - 11
IS  - 4
AB  - Achieving high strength in Mg alloys is usually accompanied by ductility loss. Here, a novel Mg97Y1Zn1Ho1 at.% alloy with a yield strength of 403 MPa and an elongation of 10% is developed. The strength-ductility synergy is obtained by a comprehensive strategy, including a lamella bimodal microstructure design and the introduction of nano-spaced solute-segregated 14H long-period stacking-ordered phase (14H LPSO phase) through rare-earth Ho alloying. The lamella bimodal microstructure consists of elongated un-recrystallized (un-DRXed) coarse grains and fine dynamically-recrystallized grains (DRXed regions). The nano-spaced solute-segregated 14H LPSO phase is distributed in DRXed regions. The outstanding yield strength is mainly contributed by grain-boundary strengthening, 18R LPSO strengthening, and fiber-like reinforcement strengthening from the nano-spaced 14H LPSO phase. The high elongation is due primarily to the combined effects of the bimodal and lamellar microstructures through enhancing the work-hardening capability.
UR  - https://doi.org/10.1016/j.jma.2022.01.002
DO  - 10.1016/j.jma.2022.01.002