MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 8090 Al-Li ALLOY

Abstract

Abstract: The change of mechanical properties of the 8090 Al-Li alloy influenced by aging is attributed to the change of δ′-phase particle size and the precipitation of S′-phase.The δ′-phase may easily precipitate and rapidly grow,but the S′-phase can only precipitate with a longer stage of incubation.The precipitation of S′-phase would be promoted by cold working prior to ag- ing.The co-precipitation of δ′- and S′-phase could improve the strength and plastieity of the alloy,for which aging at 190℃.for 20—30 h seems to be optimal.In addition,the precipitate free zone( PFZ)can form at high angle grain boundary and its width is over 200 nm in peak aging condition.But at sub-grain boundary,the formation of PFZ is difficult.

Key words: Al-Li alloy aging, microstructure, mechanical properties

LIU Yulin ZHANG Yun ZHAO Hong'en HU Zhuangqi SHI Changxu Institute of Metal Research,Academia Sinica,Shentang,China. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 8090 Al-Li ALLOY[J]. Acta Metallurgica Sinica (English Letters), 1992, 5(2): 89-94.

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