Figure 5
From: Martensitic transformation of Ti50(Ni50−xCux) and Ni50(Ti50−xZrx) shape-memory alloys

Middle eigenvalue λ2 vs. doped concentration of (a) Ti50(Ni50−xCux) and (b) Ni50(Ti50−xZrx) alloys. (c) Effect of addition content on the |1 − λ2| and thermal hysteresis ΔT of Ti50(Ni50−xCux) and Ni50(Ti50−xZrx) systems. The values of ΔT refer to the right axis and those of |1 − λ2| to the left axis. ΔT of Ni-Ti-Cu is cited from refs10,13,19,35,38,39. ΔT of Ni-Ti-Zr is cited from refs10,13.