Abstract
In this preliminary study, porous nitinol is fabricated using elemental Ni and Ti powders. The elemental powders were mixed at the ratio of 50:50 at.% by ball milling in preparation for pressing and sintering. The compacts were obtained by uniaxial pressing with a steel die of 12.5mm diameter. They were then subjected to hot isostatic pressing (HIPing) in an argon environment. The sintering pressure, temperature and time were varied in order to acquire porous nitinol. Porosity as high as 47.3% was achieved, which was benefited by partial liquid phase sintering. X-ray diffraction and energy dispersive spectroscopy (EDS) demonstrated that diffusion in the samples sintered at the temperature higher than the eutectic point was nearly complete, while the diffusion will take much longer time to complete at temperature lower that the eutectic point.
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