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中文摘要：
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^-2s^-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^-2s^-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.
英文摘要：
1.2 mm thickness sheets of ultralight Mg-llLi-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 1.67xl0-2 s_1 tensile rate,which indicates high strain rate quasi-superplasticity.Significant dy- namic recrystallization and grain refinement occur at 573 K and 1.67xl0-2 s-1 under which the grain size turns from initial 27 /im into 9 /jm,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-llLi-3Zn alloy at 573 K and 1.67xl0-2 s_1 is dislocation climb controlled by lattice diffusion.
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