Abstract
Transmission electron microscopy observations have been carried out for a Cu-14 pct Al-4 pct Ni (wt pct) alloy aged in the thin foil state in an electron microscope. It was found that large cuboidal precipitates of theγ 2 phase and many small domains of a highly ordered phase form in the DO3 matrix during aging. The small ordered domains form preferentially on matrix antiphase boundaries as well as within the antiphase domains. The formation ofγ 2 and the highly ordered phase, both of which are rich in alloy content, depletes the matrix of solute and thus raises the transformation temperaturesM s andM f. The small domains of the highly ordered phase prevent the propagation and reversion of martensite plates, leading to higherM s-Mf andA fins-Af temperature intervals.
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Kuwano, N., Wayman, C.M. Some Effects of Parent Phase Aging on the Martensitic Transformation in a Cu- AI- Ni Shape Memory Alloy. Metall Trans A 15, 621–626 (1984). https://doi.org/10.1007/BF02644193
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DOI: https://doi.org/10.1007/BF02644193