@article{Yang2025, 
author = {Zhenquan Yang and Aibin Ma and Bingqian Xu and Guowei Wang and Jinghua Jiang and Jiapeng Sun},
title = {Towards age-hardening ability enhancement and high strength in Mg–Gd–Ag alloy by balancing grain refinement and weakening of dynamic precipitation},
year = {2025},
journal = {Journal of Magnesium and Alloys},
volume = {13},
number = {4},
pages = {1699-1720},
keywords = {Mg–Gd–Ag alloy, Equal-channel angular pressing, Hot rolling, Aging behavior, High strength},
url = {https://www.sciopen.com/article/10.1016/j.jma.2024.06.032},
doi = {10.1016/j.jma.2024.06.032},
abstract = {The dilemma of choosing between superb grain boundary strengthening and excellent precipitation strengthening is commonly faced in the pursuit of high-strength age-hardenable Mg alloys. Here, a strategy for addressing this dilemma via the balance between grain refinement and weakening of dynamic precipitation is proposed and applied on a Mg–10.95Gd–2.06Ag (wt%) alloy treated by sequential processing of equal-channel angular pressing (ECAP), hot rolling and aging. The hot rolling leads to a noticeable dissolution of the dynamic precipitates intensively formed during prior ECAP, together with a tolerable grain growth. Meanwhile, numerous multi-twinning-induced lamellar bands (LBs) demarcated by coaxial grain boundaries (CGBs) subdivide the grains. For the first time, a quadruple twinning pattern for the formation of CGB with a misorientation of ~135° is raised. During post-rolling aging, besides the common β’ and γ” precipitates and the β nano-particles whose Gd/Ag ratio is much lower than that of dynamically precipitated β particles, the β”/βT precipitates, CGB segregation, and stacking fault (SF)-associated segregation/γ’ precipitates within LBs, are also involved with the precipitation structure. Benefiting from this complex precipitation structure, a good age-hardening ability manifested by the aging-induced tensile yield strength (TYS) increment reaching 115 MPa is attained. Combining with the strengthening from grain boundaries, dislocations, solutes, and basal texture, a high TYS of 447 MPa is achieved.}
}