Among the different kinds of Smart Materials one of the more promising materials are the
Shape Memory Alloys (SMA) because of their ability to perform two different tasks: "sensing
and actuating" [1 ,2]. The thermomechanical properties of SMA with view of their use as smart
materials have been recently reviewed [2,3]. Nowadays, three kinds of applications (active
shape control, active modal modification and active strain energy tuning) based specifically on
shape memory alloys are being developed [4,5].
Besides, in order to fulfil the increasing demand of smart materials with a large range of
working temperature, several systems of SMA with higher transformation temperatures (until
240°C) are being explored, such as Ni-Al, Cu-Ni-Al, Fe-Mn-Si-X, Ti-Ni-Pd (see  for a
review). Among them, Cu-Al-Ni shape memory alloys are firm candidates for applications
between 100°C and 240°C because of their low cost, relatively easy processing and good shape
memory properties. Nevertheless, due to their high elastic anisotropy (A13) and large grain
size, the Cu-Al-Ni alloys are brittle, and in general show poor mechanical properties that should
be improved in order to fulfil the requirements for practical applications.
This improvement is usually accomplished through the addition of grain refiners such as
Zr, Ti, B  to obtain a grain size lesser than 1OOm in diameter.