Microstructure and Hardness of Mg – 9Li – 6Al Alloy After Different Variants of Solid Solution Treatment
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The microstructure and the hardness of cast magnesium alloy Mg – 9% Li – 6% Al are studied after a treatment for solid solution at 300, 350, and 450°C for 0.5 – 5 h. The phase composition of the alloy is represented by α-Mg, β-Li, thin-plate and faceted particles of an AlLi phase, and particles of a MgLi2Al θ-phase. The θ-phase dissolves in the matrix in the initial stage of the solution treatment, which causes growth in the hardness of the alloy. At a temperature above 350°C the AlLi phase dissolves giving way to short rod-like precipitates of a θ-phase, which remain steady in the process of solution treatment. The hardness of the alloy deceases in this stage for this reason.
Key wordsmagnesium alloys solid solution microstructure hardness
The work has been supported by the Heilongjiang Province Youth Skeleton Program (1252G018), the Research Fund for the Doctoral Program of Higher Education (20132304110006), the Project of Science and Technology of the Heilongjiang Province Education Department (12511068), the Fundamental Research Funds for the Central Universities (HEUCF20151006), the Heilongjiang Province Natural Science Foundation (E201420), the Harbin City Application Technology Research and Development Project (2015AE005), and the Heilongjiang Postdoctoral Funds.
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