Experimental investigation in the quaternary systems Ti-Ni-Al-N and Ti-Ni-Al-O

Bertrand Huneau (1, 2) , J.J. Ding , Peter Rogl (1) , Joseph Bauer (2) , X.Y. Ding , Marcel Bohn (3)

1 Institut für Physikalische Chemie [Wien]
2 LCSIM - Laboratoire de Chimie du solide et inorganique moléculaire
3 LDO - Domaines Océaniques

The experimental evaluation of phase equilibria in the Ti–Ni–Al–N and Ti–Ni–Al–O phase diagrams are based on alloy samples, which were prepared of elemental powder blends by argon-levitation melting in a Hukin crucible. The experimental investigation employed X-ray powder diffraction, metallography, SEM, and EMPA techniques in the as-cast state as well as after annealing at 900°C. Two quaternary compounds Ti3NiAl2N and Ti3NiAl2O deriving from the filled Ti2Ni type (η phase) were observed. The novel phases are in equilibrium with the Ti2Ni-type solid solution phase (Ti1−xAlx)2Ni, which exhibits a maximum solubility of 14 at.% Al in binary Ti2Ni. Atom order in all these phases was monitored by quantitative X-ray powder diffraction (Rietveld analyses). The difference of X-ray spectra among the various phases deriving from parent Ti2Ni type was analyzed and the complex atom site occupation mode was discussed in terms of the general classification scheme for η phases.

Domaines: Mécanique [physics.med-ph]; Matériaux

Bertrand Huneau, J.J. Ding, Peter Rogl, Joseph Bauer, X.Y. Ding, et al.. Experimental investigation in the quaternary systems Ti-Ni-Al-N and Ti-Ni-Al-O. Journal of Solid State Chemistry, 2000, 155 (1), pp.71-77. ⟨10.1006/jssc.2000.8893⟩. ⟨hal-01006844⟩