MICROSTRUCTURE-PROPERTY RELATIONSHIP OF Al-2.2Li-2.5Cu-0.2Mg ALLOY

Abstract

Abstract: The relationship among the microstructures,properties and the phase transformation in Al-2.2Li-2.5Cu-0.2Mg alloy after various treatments have been studied by optical microscopy and TEM observations.It is verified that solution treated at 525℃ for 1h is saris- factory for this alloy in which all the alloying elements are dissolved in the α-Al matrix,and aging at 190℃ for 16 h is the peak-aged condition.The alloy subjected to treatment is strengthened only be T_1 phase.In overaged or underaged conditions,the alloy is strengthened by two phases,in this cases,the strengthening effect is smaller than that by one phase.The deformation prior to aging would develop the plasticity and do not decrease the strength of the experimental alloy.

Key words: A1-Li alloy, heat treatment, structure, property

ZHANG Yun ZHAO Hong'en YAO Daping GAO Guozhong CHEN Jizhi HU Zhuangqi Institute of Metal Research,Academia Sinica,Shenyang,China[Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A161—A167. Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang,110015,China. MICROSTRUCTURE-PROPERTY RELATIONSHIP OF Al-2.2Li-2.5Cu-0.2Mg ALLOY[J]. Acta Metallurgica Sinica (English Letters), 1989, 2(6): 391-397.

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MICROSTRUCTURE-PROPERTY RELATIONSHIP OF Al-2.2Li-2.5Cu-0.2Mg ALLOY

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