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采用铸造和轧制的方法获得了1.2 mm厚密度为1.43 g/cm~3的超轻Mg-11Li-3Zn合金板材,在573 K和1.67×10~(-2)s~(-1)条件下拉伸获得了200%的延伸率,其在高应变速率下呈现准超塑性;在拉伸过程中试样发生显著的动态再结晶导致晶粒细化,晶粒尺寸由平均27μm减小到9μm;此条件下的应力指数为4.4,流动激活能112.6 kJ/mol.分析表明,573 K和1.67×10~(-2)s~(-1)条件下试样拉伸过程中的变形机理为晶格扩散控制的位错攀移.
The 1.2 mm thick ultra-light Mg-11Li-3Zn alloy plate with a density of 1.43 g / cm ~ 3 was obtained by casting and rolling at 573 K and 1.67 × 10 -2 s -1 conditions Lower draw achieved a 200% elongation, which showed quasi-superplasticity at high strain rates; significant dynamic recrystallization of the specimen during drawing resulted in grain refinement with a decrease in grain size from an average of 27 [mu] m to The stress index under this condition is 4.4, and the activation energy of flow is 112.6 kJ / mol. The analysis shows that the deformation mechanism of the sample under the conditions of 573 K and 1.67 × 10 ~ (-2) s ~ (-1) Dislocation climbing controlled by lattice diffusion.