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  3 ⇒  Ј 3 to  3 ⇒ ␥ Ј 3 , with an intermediate concentration range where both martensites coexist due to a  3 ⇒ ␥ Ј 3 ϩ  Ј 3 transformation. On the other hand, an increase of nickel content stabilizes the martensite  Ј 3 , changing from a mixed  3 ⇒ ␥ Ј 3 ϩ  Ј 3 to a single  3 ⇒  Ј 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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