SOBRERO cesar Enrique
The effect of ageing and annealing on shape memory properties of Cu-Al-Ni melt-spun ribbons
P. LA ROCA; C. SOBRERO; J. MALARRÍA; PH. VERMAUT; P. OCHIN; R. PORTIER
Año: 2009 vol. 18 p. 217 - 218
Cu-13.5Al-5.5Ni-1Ti tapes with a grain refined microstructure of ~2 μm were obtained by melt spinning. The martensitic transformation temperatures of the precursor alloy were Ms= 101°C, Mf= 96°C, As= 112°C, Af= 124°C. As result of the rapid solidification process, the transformation temperatures of this high temperature shape memory alloy shift below 0°C, and the melt spun ribbons are in the austenite phase at room temperature. Figure 1 shows the characteristic cell morphology of the austenite microstructure: The cells are clearly outlined by plates of martensite placed on their boundaries, corresponding mainly to the 18R orthorhombic structure although the 2H hexagonal structure was also observed.