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Mg-9Li-6Al(LA96) and Mg-9Li-6Al-2La(LA96-2La), after solution treatment, were aged at 50°C and 150°C, respectively. The microstructure evolution and hardness variation of the alloys under different aging parameters were investigated. The results show that the morphology of MgLi 2 Al(h) phases in LA96 changes from short and rod like to particulate during the aging period, and the size of particulate phase becomes larger and larger in the late aging period. The small, stripy a phases precipitate from b phases. The microstructure evolution leads to a continuous decrease in hardness. A temporary increase of hardness appears in the process of aging treatment at 150°C because of the precipitation of AlLi phases. The addition of La inhibits the variation of MgLi 2 Al morphology and the precipitation of small and stripy a phases in b phases, and it makes the decrease rate of hardness become lower in the process of aging treatment.

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