鋁鋰合金的合金化與微觀組織演化

鋁鋰合金的合金化與微觀組織演化Alloying and microstructural evolution of Al-Li alloys

評述了鋁鋰合金的發(fā)展歷程和應用以及我國鋁鋰合金研究所取得的成果。闡述了第3代鋁鋰合金的成分、微觀組織和性能特點，討論了合金化元素在調控鋁鋰合金微觀組織進而改善性能方面的作用。大量研究表明，這些合金化元素可改變鋁鋰合金中原有析出相的大小、形狀、分布，或刺激新強化相的析出，也可以細化晶粒、控制再結晶和晶粒取向。時效析出過程的本質和動力學在很大程度上取決于合金化元素之間的交互作用和合金原子的團簇化過程。

The development history of Al-Li alloys  and the achievements  gained in China  were  reviewed. The composition, microstructure and properties of the third generation Al-Li alloys were reviewed as well, and in particular,the effect of alloying elements on the microstructure and the further improvement of the properties was discussed in detail. Numerous studies demonstrate that the alloying elements  can modify the  dimension, morphology and  distribution  ofphases, or stimulate the precipitation of the new phase in Al-Li alloys, and in addition, are also able to refine the grain structure, control the  recrystallization  and  grain orientation. Essentially, the  nature  and  kinetics  of the precipitation process depend on the interaction of alloying elements and the co-clustering sequence.

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