Abstract
Powder metallurgy (PM) fabricated TiNi alloy is suffering from the reaction between Ti and Ni preferentially generates Ti2Ni and TiNi3, which inhibits the growth of the TiNi phase and extremely prolonging the sintering duration required for phase homogenization. In this case, we propose a novel strategy for preparing TiNi alloy utilizing Ti2Ni and TiNi3 intermetallic compound powders. This approach simplifies the reaction process by transforming the multi-step reactions (2Ti+NiTi2Ni, Ti+3NiTiNi3, and 2Ti2Ni+TiNi3 =5TiNi) into a one-step reaction (2Ti2Ni+TiNi3 =5TiNi). Consequently, the reaction process is shortened, and the growth rate of the TiNi phase is improved. Furthermore, results reveal that Ti2Ni-TiNi3 diffusion couple exhibits 8 times higher efficiency than the Ti-Ni diffusion couple in generating the TiNi phase. The as-prepared TiNi alloy exhibits high relative density, homogeneous phase distribution, and a fine grain size of 0–4.5 µm. These findings provide valuable insights into the efficient preparation of TiNi alloy through the PM method, with potential benefits for various applications.
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