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

Abstract

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 c’ 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.