Texture evolution during annealing of Ni-Ti Shape Memory Alloy


Texture evolution during annealing of Ni-Ti Shape Memory Alloy

Braz Fernandes, F. M.; Paula, A. S.; Canejo, J.; Mahesh, K. K.; Silva, R. J. C.; Martins, R. M. S.; Cardoso, A. M. A.; Schell, N.

Anisotropy of the shape recovery associated with shape memory effect strongly depends on the type of preferential orientation, that is present, as well as the ‘strength’ of the texture. In the present paper, we report the results obtained by the in-situ study of texture evolution during the annealing process in Ti-rich Ni-Ti Shape Memory Alloys (SMAs) with different thermal and mechanical histories. For this purpose, a Be-dome furnace installed into a 6-circle goniometer at the BM20 beamline (ROBL-CRG) at the ESRF (Grenoble) has been used. It is shown that there is a significant change in the preferential orientation of B2 phase, with the change in microstrain/coherence domain size, as a function of annealing temperature. This effect is also observed in the B19’ phase after cooling. The alpha-fiber II (austenite texture - <110>||RD ({111}<110>-{110}<110>) was present in the as-received alloy, but only up to 400ºC. The evolution of {111}<110> austenite texture component is quite clear for annealing temperatures above 400ºC.

  • Lecture (Conference)
    Conference on Shape Memory and Superelastic Technology-Europe 2004, 03.-07.10.2004, Baden-Baden, Germany
  • Contribution to proceedings
    Conference on Shape Memory and Superelastic Technology-Europe 2004, 03.-07.10.2004, Baden-Baden, Germany
    Proceedings of Shape Memory and Superelastic Technology 2004, Baden-Baden: ASM International, 45-50

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Publ.-Id: 9117