Developing a High Ductility Mg Alloy Via Non-basal Slips and Intergranular Coordination Induced by Li and Er Addition

• Published in: Metals and materials international 2024, 30(7), , pp.1849-1863
• Main Authors: Tang, Ruyue, Zhang, Jing, Li, Bingcheng, Dong, Quan
• Format: Article
• Language: English
• Subjects: Alloying; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coordination; Ductility; Electron back scatter; Engineering Thermodynamics; Grain boundaries; Heat and Mass Transfer; Machines; Magnesium base alloys; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Misalignment; Nonbasal dislocations; Processes; Room temperature; Shear stress; Slip; Solid Mechanics; Tensile deformation; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-023-01620-6

The poor ductility of magnesium (Mg) alloys at room temperature restricts its large-scale usage in industry. In this work, we design low-alloying Mg-3Li− x Er( x  = 0.2, 0.8 wt%) alloys with high ductility. Quasi-in-situ electron back-scatter diffraction observation, combined with slip trace analysis and in-grain misorientation axes analysis, was carried out to systematically characterize the microstructural evolution and slip deformation mode during the tensile deformation of the Mg-3Li- x Er alloys. The results showed that the synergy effect of solute Li and Er dramatically reduces the critical resolved shear stress  ratios between non-basal and basal slip, thus contributing to the activation of considerable non-basal dislocations. Additionally, Er microalloying increases the frequency of grain boundaries with misorientation angles ( θ s ) being in the range of 75