J. Phys. IV France 01 (1991) C4-373-C4-378
TRANSFORMATION BEHAVIOUR OF THE Al - 65% Ni ALLOYJ.H. MAAS1, L. TOTH2, A.A.H. HAMERS1 and J. BEYER1
1 University of Twente, Faculty of Mechanical Engineering, Laboratory for Materials Science, PO. Box 217, NL-7500 AE Enschede, The Netherlands
2 Research Institute for Technical Physics, Budapest, Hungary
The martensitic transformation and the precipitation behaviour of quenched Ni65Al35 alloys were studied by structural and thermal analytical techniques. It is shown that the thermally induced martensite phase is not thermoelastic at this composition, but thermoelastic martensite may be created by the introduction of thermal or mechanical stress. The Ni5Al3 precipitate phase developed from the martensite during annealing above 600 K is suggested to be metastable, in contrast to the generally accepted view. The presence of Ni2Al type ordering in the martensite phase of slowly cooled samples is reported and correlated with the greater stability and irreversibility of the martensite.
© EDP Sciences 1991