Abstract
Phase relations in the ternary system N-Ni-Ti have been established experimentally for the 900 °C isothermal section assisted by thermodynamic modeling. Phase equilibria are characterized by an appreciable amount of up to ≅11 at. % N dissolved in the octahedral interstices of the crystal structure of Ti2Ni. Two-phase equilibria are formed at 900 °C among the pairs Ti2N + Ti2NiNx, TiN1-x + Ti2NiNx, TiN1-x + TiNi1-x, and TiN1-x + Ni(Ti)x. The investigation is based on X-ray powder diffraction, metallography, scanning electron microscopy, and electron probe microanalysis techniques on about 50 alloys, which were prepared by arc melting or high-frequency levitation melting of appropriate blends of Ti,Ni-powders with TiN used to introduce nitrogen. Key experiments related to the N solubility in the Ti2Ni phase have been triggered by an interactively performed thermodynamic modeling. The experimental results are in fine agreement with the thermodynamic calculation.
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Le Friec, Y., Rogl, P., Bauer, J. et al. Investigation of the nitrogen-nickel-titanium system: The isothermal section at 900 °C. JPE 19, 112–123 (1998). https://doi.org/10.1361/105497198770342571
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DOI: https://doi.org/10.1361/105497198770342571