Abstract
Porous TiNi shape memory alloys attracted extensive interests for their potential use as biomedical materials because of their similar microstructure to human bone and the unique mechanical properties. In this paper, an equiatomic porous TiNi alloy was prepared from elemental powders by Ar-sintering. The pore features of the porous TiNi alloy were studied by optical microscopy and scanning electronic microscopy (SEM). The mechanism of pore-formation and pore-development were proposed. X-ray diffraction (XRD) and differential scanning calometry (DSC) were used to investigate the microstructure and the temperature of phase transformation of the alloy. Compression and flexural test were carried out to determine the mechanical properties of the porous TiNi alloy. The porous TiNi alloy sintered at 980 °C in argon for 8 h was found to be composed mainly of TiNi phase with promising properties, of which the ultimate compressive and flexural strength was 677 and 246 MPa, respectively. The porosity ratio of porous TiNi alloy was up to 45%. The DSC measurements revealed the A s and A f temperatures of the alloy was 32.5 and 45.6 °C, respectively.
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