The phenomenon of post-aging retrogression in magnesium alloys containing two rare-earth metals belonging to different groups, i.e., yttrium Y (the yttrium group) and samarium Sm (the cerium group), is investigated. It is shown that retrogression may occur in alloys with different proportions of yttrium and samarium aged at 200°C for maximum hardness and then annealed at somewhat higher temperatures (250 and 300°C). The process is possible due to decomposition of the supersaturated magnesium solid solution. The degree of the retrogression is shown to depend on the temperature and duration of the post-aging annealing and on the yttrium- to-samarium proportion in the alloys.
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Here and below in the paper the content of elements is given in mass percent.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 18 – 25, October, 2020.
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Rokhlin, L.L., Dobatkina, T.V., Tabachkova, N.Y. et al. Post-Aging Retrogression in Magnesium Alloys with Two Rare-Earth Metals Belonging to Different Groups. Met Sci Heat Treat 62, 615–621 (2021). https://doi.org/10.1007/s11041-021-00613-9
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DOI: https://doi.org/10.1007/s11041-021-00613-9