The pore evolution process of porous NiTi shape memory alloys (SMAs) fabricated by capsule free hot isostatic pressing (CF-HIP) was investigated by adopting different fabricating parameters in this study. It has been demonstrated that porous NiTi SMAs with homogeneous pore distribution and nearly rounded pore shape can be prepared by CF-HIP under suitable condition. In addition, two special kinds of porous NiTi SMAs with novel pore structure were fabricated by adjusting CF-HIP parameter. One of them has a special sandwich structure distribution of pore along radical section. This structure was formed owing to the balance between hot pressure in the HIP furnace and gas pressure produced by gas expansion in the green sample. Another one shows gradient distribution of pore size along radical direction, increased from outside to the center, which is related to the formation of air bubble in the melting NiTi alloy.

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