Precipitation phenomena in the Mg-31 at% Li-1 at% Al alloy |
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Authors: | Alamo A Banchik A D |
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Affiliation: | (1) Departamento Materiales, Comisión Nacional de Energia Atómica, 1429 Buenos Aires, Argentina;(2) Present address: Section d'Etude des Solides Irradiés, Centre d'Etudes Nucléaires de Fontenay-aux-Roses, 92260, France |
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Abstract: | Precipitation phenomena produced in the -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 -field. Phase reactions for specimens quenched and then aged can be summarized as follows: ++ after ageing at room temperature; + ++ 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 -phase nor the AlLi-phase precipitation can account for the observed hardening process. The presence of the -metastable phase when the hardness reaches its maximum value is verified. |
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