Abstract
Precipitation phenomena produced in the β-phase (b c c) of the Mg-31 at% Li-1 at%Al alloy subjected to different heat treatments have been studied by sensitive single-crystal X-ray diffraction techniques. The variation of the hardness values of specimens quenched and then aged was also examined. It was confirmed that AlLi is a stable phase at room temperature for the examined Al content; AlLi precipitation is only produced for very slow cooling rates from the β-field. Phase reactions for specimens quenched and then aged can be summarized as follows: β → β+θ+α after ageing at room temperature; β→ β+ θ+α+ AlLi after ageing at 473 K. A considerable increase of the hardness, which attains its maximum value after about 30 h ageing at room temperature, was observed. Neither the α-phase nor the AlLi-phase precipitation can account for the observed hardening process. The presence of the θ-metastable phase when the hardness reaches its maximum value is verified.
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Alamo, A., Banchik, A.D. Precipitation phenomena in the Mg-31 at% Li-1 at% Al alloy. J Mater Sci 15, 222–229 (1980). https://doi.org/10.1007/BF00552448
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DOI: https://doi.org/10.1007/BF00552448