QUASI–SUPERPLASTICITY AND DEFORMATION MECHANISM OF ULTRALIGHT β SOLID SOLUTION Mg–11Li–3Zn ALLOY
CAO Furong 1, DING Hua 1, WANG Zhaodong 2, LI Yinglong 1, GUAN Renguo 1, CUI Jianzhong 3
1. College of Materials and Metallurgy, Northeastern University, Shenyang 110819
2. State Key Lab of Rolling and Tandem Rolling Automation, Northeastern University, Shenyang 110819
3. Key Lab of Materials Electromagnetic Process Research, Ministry of Education, Northeastern University, Shenyang 110819
Cite this article:
CAO Furong DING Hua WANG Zhaodong LI Yinglong GUAN Renguo CUI Jianzhong . QUASI–SUPERPLASTICITY AND DEFORMATION MECHANISM OF ULTRALIGHT β SOLID SOLUTION Mg–11Li–3Zn ALLOY. Acta Metall Sin, 2012, 48(2): 250-256.
Abstract 1.2 mm thickness sheets of ultralight Mg–11Li–3Zn alloy with a density of 1.43 g/cm3 was obtained by casting and rolling, the elongation to failure is 200% at 573K with 1.67×10−2 s−1 tensile rate, which indicates high strain rate quasi–superplasticity. Significant dynamic recrystallization and grain refinement occur at 573 K and 1.67×10−2 s−1 under which the grain size turns from initial 27 μm into 9 μm, the stress exponent is 4.4 and the activation energy for flow is 112.6 kJ/mol. It is considered that the deformation mechanism of Mg–11Li–3Zn alloy at 573 K and 1.67×10−2 s−1 is dislocation climb controlled by lattice diffusion.
