Abstract
The martensitic transformation temperatures and the types of martensitic phases have been determined in a wide concentration range of technological interest for Cu-Al-Ni shape-memory alloys (SMAs) A stability diagram of martensitic phases as a function of alloy concentration has been determined. It is found that when the aluminum content increases, the transformation changes from β 3 ⇒ β′3 to β 3 ⇒ γ′3, with an intermediate concentration range where both martensites coexist due to a β 3 ⇒ γ′3+β′3 transformation. On the other hand, an increase of nickel content stabilizes the martensite β′3, changing from a mixed β 3 ⇒ γ′3 + β′3 to a single β 3 ⇒ β′3 transformation. Furthermore, linear relationships between M s and Al and Ni concentrations have been obtained for all types of martensitic phases.
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Recarte, V., Pérez-Sáez, R.B., San Juan, J. et al. Influence of Al and Ni concentration on the Martensitic transformation in Cu-Al-Ni shape-memory alloys. Metall Mater Trans A 33, 2581–2591 (2002). https://doi.org/10.1007/s11661-002-0379-8
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DOI: https://doi.org/10.1007/s11661-002-0379-8