SUPERPLASTICITY OF A RAPIDLY SOLIDIFIED AI-Li ALLOY

Abstract

Abstract: A rapidly solidified microcrystalline Al-Li-Cu-Mg-Zr alloy and its superplasicity have been investigated.An optimum tensile elongation of 585% was obtained at 540℃ and strain rate 1.67×10~(-2)s~(-1).The superplastic Al-Li alloy is manufaetured using thermomechanical pro- cessing:solution,overaging,warm rolling and recrystallization.Microstructural changes in thermomechanical processing and cavitation occurred during superplastic deformation have been observed.The superplastic failure of alloy may be caused mainly by nucleation and growth of cavities as well as the linkage around grains.

Key words: superplasticity, Al-Li alloy, rapid solidification, thermomechanical processing

MANG Weishi WANG Guozhi ZHANG Yongchang HU Zhuangqi SHI Changxu Institute of Metal Research,Academia Sinica,Shenyang,China Yongchang Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China. SUPERPLASTICITY OF A RAPIDLY SOLIDIFIED AI-Li ALLOY[J]. Acta Metallurgica Sinica (English Letters), 1990, 3(4): 236-242.

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SUPERPLASTICITY OF A RAPIDLY SOLIDIFIED AI-Li ALLOY

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