The effect of aluminium content and solution heat treatment in α+β phase region on the shape memorycharacteristics and mechanical properties of cold wrought Cu-Al-Ni-Mn-Ti alloy are studied in this paper. Re-sults indicate that the transformation temperature (Tt) of Cu-Al-Ni- Mn-Ti alloy reduces obviously with the in-crease of the amount of α-phase. During aging at 623K, T_l increases at first up to a peak value, then decreaseswith prolongation of aging time. Life time of heat resistance of the alloy at high temperatures is improved withincrease of the amount of α-phase, this life time becomes poor with Bainite precipitation. When the amount ofα-phase is less than 5% the ratio of shape recovery brought about by the solution heat treatment in α+β phaseregion is almost not effected. However, plasticity of the alloy increases obviously as aluminium content de-creases. We believe that improving cold workability of Cu-Al-Ni-Mn-Ti alloy and keeping good heat resistantproperty and shape memory effects are possible by means of reducing the content of aluminium and solulionheat treatment in α+β phase region.
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