PRECIPITATION OF S' PHASE IN AN 8090 Al-Li ALLOY

来源期刊：中国有色金属学报(英文版)1992年第3期

论文作者：Zheng Ziqiao Hori S

文章页码：77 - 82

Key words：AI-Li alloys; S' phase; aging precipitation

Abstract: The precipitation of S' phase in an 8090 Al-Li alloy under various aging conditions was investigated by transmission electron microscopy. The results show that a small quantity of S' precipitates precipitated on the grain and subgrain boundaries for the specimens aged to peak hardness during single aging. Cold working prior to aging promoted the widespread precipitation of S' phase because of increasing dislocation density. In natural aging the vacancies bound by Li atoms were released and formed dislocation loops. S' precipitates preferentially nucleated and grew on the dislocation loops.