“…doi:10.1016/j.jmbbm.2010.10.008 wires, the superelasticity is exhibited a low continuous force with a plateau during unloading. In special conditions, R phase transformation occurs as a premartensitic phase with about 0.1% transformation strain (Otsuka and Ren, 2005;Seyyed Aghamiri et al, 2009;Wilkinson et al, 2002). It has known that superelastic behavior can be improved by precipitation hardening during an ageing treatment.…”