Shape memory properties of Cu-based thin tapes obtained by rapid solidification methods

J. MALARRÍA, C. ELGOYHEN, PH. VERMAUT, P. OCHIN AND R. PORTIER

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

ELSEVIER SCIENCE SA

Año: 2006 vol. 438 p. 763 - 767

0921-5093

Two different rapid solidification techniques were utilized to produce thin tapes of Cu-13Al-xNi-1Ti (wt %, with x= 5, 5.5, 6) shape memory alloys directly from the melt. Both melt-spinning and twin-roll casting (quenching between the gap of two rollers) have resulted successful methods to obtain ribbons (8 mm width, 55 µm thickness) and strips (29-30 mm width, 450 µm thickness) with grain sizes below 2 µm, after optimization of the processing parameters. Although as a consequence of the rapid solidification the martensitic transformation temperatures are depressed, after annealing at 700 ºC the high transition temperatures of the alloys in the bulk form are re-established. Measuring of length change under uniaxial tensile load shows elongations up to 1.8 % (at 90 MPa) on cooling through the martensitic transformation