Martensitic Transformation in Aged
CopperAluminumManganese Alloys

I. R. Bublei, Yu. N. Koval’, and P. V. Titov

Institute of Metal Physics, National Academy of Sciences of Ukraine, pr. Vernadskogo 36, Kiev, 252680 Ukraine

Received October 16, 1996; in final form, June 25, 1997

Abstract—Effects of the decomposition of the supercooled ₁ phase on the martensitic transformation in
CuAl–Mn alloys is considered. Variation of the martensitic transformation temperature upon isostructural
decomposition of the ₁ phase is related to the formation of regions both enriched in and depleted of manga-
nese, as well as to the precipitation of Cu₂MnAl particles that do not undergo martensitic transformation. In
some cases, such a decomposition leads to the development of a two-stage martensitic transformation in two
nonoverlapping temperature ranges.

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