Effect of precipitation on the microstructure and the shape memory response of the Ni50.3Ti29.7Zr20 high temperature shape memory alloy

Structure–property relationships in a precipitation strengthened Ni–29.7Ti–20Hf (at%) shape memory alloy

“…Ni-Ti-Hf [13,14,15] and Ni-Ti-Zr [16,17] high-temperature SMAs with good work output, stable large-strain pseudoelastic behavior at elevated temperatures, and nearly unprecedented dimensional stability during thermomechanical cycling. The Hf and Zr macro-additions provide a much lower cost alternative relative to the precious metal containing alloys.…”

The compositional stability of the P-phase in Ni–Ti–Pd shape memory alloys

“…However composition may be insufficient because there are other critical microstructural features e correct volume fraction, precipitate size, etc. e which may regulate the martensitic transformation temperatures and functional properties [16,20,23,25,26,28,49,50]. Additional work in this area is underway.…”

Influence of tantalum additions on the microstructure and shape memory response of Ti 50.5 Ni 24.5 Pd 25 high-temperature shape memory alloy

“…The problem is exacerbated for HTSMAs, since the materials, by definition, operate at elevated temperatures resulting in decreased strength levels and the possibility of thermally activated deformation processes [6,7,13]. Several solutions have been proposed to alleviate the dimensional instability problem in HTSMAs, all of which target improving the strength of the alloy through (a) solidsolution strengthening [8,14,15], (b) thermomechanical processing [9,16,17], and (c) precipitation hardening [18][19][20][21].…”