Functional Properties of Highly Textured Fe–Ni–Co–Al–Ti–B Shape Memory Alloy Wires

SOBRERO, C.; REMICH, V.; CASSINEIRO, J.; GIORDANA, M.F.; ABREU FARIA, G.; LIEHR, A.; FREUDENBERGER, J.; NIENDORF, T.; KROOß, P.

Shape Memory and Superelasticity

Springer

Año: 2023

2199-384X

The effect of thermomechanical treatments on grain size and precipitate evolution as well as their impact on the shape memory properties of cold-drawn Fe41–Ni28–Co17–Al11.5–Ti2.5–B0.05 (at. %) wires were studied. Cold drawing produces a strong {hkl} < 111 > /{hkl} < 001 > texture in this alloy. Different thermal treatments promote the evolution of specific recrystallisation textures as well as grain growth, while ageing at 600 °C to 650 °C leads to the formation of γ’ precipitates. Variation in size and distribution of the precipitates via ageing significantly affect the functional properties. A maximum transformation strain of 1.3% without fracture was obtained on sample tested on heating–cooling experiments.