Porous NiTi with different porosities were fabricated by capsule-free hot isostatic pressing (CF-HIP). The effects of the cold compaction pressure and TiH2 addition on the properties of porous NiTi alloys prepared by CF-HIP were systematically investigated. The porosity of the porous materials varies with the cold compaction pressure of the green compacts. TiH2 addition significantly improves both the porosity and pore interconnection, but slightly impairs the mechanical properties of porous NiTi alloys. In comparison with porous NiTi fabricated by other methods, the stress-strain curves reveal that porous NiTi prepared by CF-HIP has higher compression strength and excellent superelasticity (SE). Furthermore, the phase transformation temperature shifts to a slightly lower value with TiH2 addition, which favors the superelasticity of porous NiTi at human body temperature.

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