Abstract
The microstructure evolution of Mg–9Li–6Al and Mg–9Li–6Al–2Y with the variation of solid solution parameters was investigated. Results show that, in Mg–9Li–6Al, under the condition of 340°C×0.5h, the MgLi2Al phase is dissolved in the phase of β-Li, and the AlLi phase precipitates from α-Mg phase. With the holding time being prolonged to 1h, the precipitated AlLi distributes in the whole phase of α-Mg. Under the condition of 440°C×0.5h, the AlLi phase is dissolved in the matrix, and MgLi2Al phase precipitates from β-Li. The addition of 2wt.% Y in Mg–9Li–6Al can promote the precipitation of MgLi2Al phase and restrain the precipitation of AlLi phase, causing the increase of hardness of the alloy.
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