Effect of Ce Microalloying on Microstructure and Mechanical Properties of Extruded Mg–10Gd–0.5Zr Alloy

• Published in: Metals and materials international Vol. 29; no. 11; pp. 3190 - 3203
• Main Authors: Yang, Laidong, Li, Quanan, Chen, Xiaoya, Mei, Wanwan, Zhang, Nana
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.11.2023; Springer Nature B.V; 대한금속·재료학회
• Subjects: Aging; Aging (metallurgy); Aspect ratio; Basal plane; Casting alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Dynamic recrystallization; Engineering Thermodynamics; Extrusion; Grain boundaries; Grain size; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Microalloying; Microstructure; Precipitation hardening; Processes; Solid Mechanics; Strengthening; Texture; Ultimate tensile strength; Yield strength; 재료공학; Mg–10Gd–0.5Zr alloy; Texture; Microstructure and mechanical properties; Ce microalloying; Strengthening mechanism
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-023-01438-2

The influence of Ce microalloying (0.6 wt%) on the microstructure and strengthening mechanism of the extruded Mg–10Gd–0.5Zr alloy were comprehensively researched and analyzed. The experimental results revealed that the addition of 0.6 wt% Ce excellently reduced the grain size of the as-cast alloy and increased the amount of Mg 5 Gd eutectic phase. The Ce microalloying promoted the dynamic recrystallization level of the extruded alloy, reduced the number and grain size of deformed grains, increased the number of dynamically recrystallized grains, and transformed the basal plane < 10 1 ¯ 0 > fiber texture gradually into < 0001 > texture. Ce microalloying promoted the dynamic precipitation of a small amount of β-Mg 5 Gd and α-Mg 12 Ce particles. After peak aging, the Ce microalloying improved the aging response, increased the aging hardness of the alloy, promoted the aging precipitation of β ′ phase, and enhanced the quantity and aspect ratio of β ′ phase. The incremental tensile yield and ultimate tensile strength of the extruded alloy resulting from Ce microalloying are 14 MPa and 11 MPa separately, and those of the peak-aged alloy are 53 MPa and 34 MPa respectively. The increase in yield strength of the extruded and peak-aged alloy is ascribed to the enhanced grain boundary strengthening and the promotion of the β ′ phase precipitation strengthening by Ce microalloying, respectively. Graphical Abstract