Conclusions
Titanium nickelide powder produced by the calcium hydride reduction method possesses a very extended transformation range. Hence the material must exhibit the combined properties of superelasticity and shape memory over a very wide temperature range.
During powder compacting additional factors (geometrical and physical) come into play which alter the transformation temperature. The effect of these becomes stronger with increasing compacting pressure. These factors are the binding of structural elements at contacts between particles, which may be released by the restoring stress which increases with increasing temperature, and also the participation of the usual plastic flow mechanisms in the process of deformation of the material.
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Translated from Poroshkovaya Metallurgiya, No. 11 (347), pp. 40–46, November, 1991.
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Goncharuk, N.V., Klochkov, L.A., Kotenev, V.I. et al. Characteristics of the martensite transformation in powder titanium nickelide. Powder Metall Met Ceram 30, 935–940 (1991). https://doi.org/10.1007/BF00794596
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DOI: https://doi.org/10.1007/BF00794596