Liquidus Projection Surface and Isothermal Section at 1200 °C of Ni-Ru-Y

• Published in: Journal of phase equilibria and diffusion Vol. 36; no. 2; pp. 149 - 168
• Main Authors: Coetzee, S. H., Cornish, L. A., Witcomb, M. J., Jain, P. K.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-04-2015; Springer Nature B.V
• Subjects: Ceramics; Composites; Crystallography and Scattering Methods; Engineering Thermodynamics; Glass; Heat and Mass Transfer; Metallic Materials; Natural Materials; Physics; Physics and Astronomy; Thermodynamics; energy dispersive spectrometry (EDS); scanning electron microscopy (SEM); liquidus surface projection; Ni-Ru-Y; ternary phase diagram; isothermal section 1200 °C
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-015-0368-4

Scanning electron microscopy studies with energy dispersive x-ray analyses of as-cast and annealed samples of Ni-Ru-Y were used to produce a solidification projection, a liquidus projection surface and an isothermal section at 1200 °C. The ~YNi
2
, ~YNi
3
and ~YRu
2
phases had wider solubilities than line compounds, and also extended the furthest into the system. The binary phase extensions into the ternary were: ~51 at.% Ru for ~YNi
2
; ~22 at.% Ru for ~YNi
3
; ~13 at.% Ru for ~YNi
5
; ~7 at.% Ru for ~YNi; ~12 at.% Ni for ~YRu
2
and ~10 at.% for ~Y
44
Ru
25
. Ruthenium stabilised ~YNi
2
, so that it solidified at a higher temperature in the ternary than in the Ni-Y binary. A ternary phase was confirmed at Y
51
Ru
15
Ni
34
(at.%), which forms in a peritectic reaction. The ~Y
3
Ru and ~Y
3
Ni phases were isomorphous and formed a continuous solid solution. Heat treatment at 1200 °C gave the phases: (Ru), ~YRu
2
, ~YNi
2
, ~YNi
3
, ~YNi
4
, ~YNi
5
and (Y).