Development of Novel Mg-Al-Mn-Based Alloys with High-Strength and Ductility via Co-Addition of Ce and Ca
Wei Liu,
Shuo Li,
Hucheng Pan,
Yuan Zhang,
Zhen Pan,
Sen Wang,
Yuping Ren,
Gaowu Qin
Affiliations
Wei Liu
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Shuo Li
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Hucheng Pan
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Yuan Zhang
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Zhen Pan
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Sen Wang
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Yuping Ren
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Gaowu Qin
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
In this work, the novel Mg-Al-Mn-Ce-(Ca) alloy system has been developed, and large-scaled and thin-walled Mg alloy extruded profiles with an actual composition of Mg-8Al-0.57Mn-0.42Ce (AM80E), and Mg-8Al-0.57Mn-0.42Ce-0.31Ca (AM80EA) were successfully fabricated. The extruded AM80EA alloy profile exhibited a refined recrystallized grain structure (with an average size of ~6.96 μm) and high-density second phase. These abundant micro-nano precipitates effectively inhibited grain boundary migration during recrystallization, achieving obvious grain refinement and providing strong grain refinement strengthening effects. Concurrently, these high-density second-phase particles can also prevent dislocations from slipping. The fine-grain strengthening and second-phase strengthening contribute to the yield strength (YS) of ~174 MPa, the ultimate tensile strength (UTS) of ~309 MPa, and the elongation (EL) of ~13.7% of the AM80E alloy profile. Through the further addition of the Ca element, the AM80EA alloy achieves better comprehensive mechanical properties than the AM80E alloy, exhibiting a YS of ~193 MPa, UTS of ~346 MPa, and EL of ~16.5%. This study demonstrates that, through rational alloying design and extrusion process control, Mg-Al-Mn-Ce-(Ca)-based alloy profiles with excellent mechanical properties can be obtained. Relevant work would provide references for developing these cost-effective high-strength Mg alloy products and promote their industrial applications.
