The effect of copper doping on martensite shear stress in porous TiNi(Mo,Fe,Cu) alloys

The properties of alloys based on porous nickel-titanium (TiNi) with copper additives have been studied. It is established that the copper doping of porous TiNi(Mo,Fe,Cu) alloys fabricated by the method of self-propagating high-temperature synthesis leads to a significant decrease in the martensite shear stress (below 30 MPa). Low values of the martensite shear stress $(\sigma_{\mathrm{min}})$ in copper-doped TiNi-based alloys allows medical implants of complex shapes to be manufactured for various purposes, including oral surgery. The optimum concentration of copper additives (within 3–6 at%) has been determined that ensures high performance characteristics of TiNi-based porous alloys for medical implants.