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摘要
The TiNiNb prealloyed powder was prepared into a large-sized TiNiNb alloy tube (inner diameter of 15 mm, outer diameter of 35 mm, height of 100 mm) by hot isostatic pressing. The microstructure, mechanical properties and martensitic transformation behavior of the prepared TiNiNb alloy tube were investigated. The results show that when the hot isostatic pressure process parameters were 1 373 K, 110 MPa, holding temperature and pressure for 3 h, the large-sized TiNiNb alloy tube with uniform microstructure could be prepared. The microstructure of TiNiNb alloy tube mainly included TiNi matrix phase, β-Nb phase and a small amount of (Ti,Nb)2Ni phase. The hardness of TiNiNb alloy tubes prepared by hot isostatic pressing was higher than that of forged TiNiNb alloys. The martensitic transformation behaviors of TiNiNb alloy tubes were studied. It was found that the martensite phase transformation of the alloy was a two-step phase transformation, but not obvious.
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