A metallographic study of the Al–Ni–Re phase diagram

• Published in: Journal of alloys and compounds Vol. 291; no. 1; pp. 145 - 166
• Main Authors: Cornish, L.A., Witcomb, M.J.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 27-09-1999; Elsevier
• Subjects: Al–Ni–Re alloys; Applied sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Liquidus projection; Materials science; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Ternary phase diagram; Ternary phase diagram; Liquidus projection; Al–Ni–Re alloys; Phase diagrams; Nickel alloys; Aluminium alloys; Solubility; Metallography; Experimental study; Microstructure; Rhenium alloys; Transition element alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(99)00245-5

An investigation undertaken on the Al–Ni–Re system using optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction revealed that the largest liquidus surface was due to (Re). The Al
5Re
24 composition was shown to be the limit of solubility of (Re). No exclusively new ternary phases were found, and the solubilities of the binary phases were limited. Al
3Re and Al
6Re had solubilities of up to ∼5 at. % Ni, AlNi up to ∼2 at. % Re (maximum), and AlRe
2 up to 2 at. % Ni. The AlNi
3, Al
3Ni
2, Al
3Ni, Al
2Re
3 and Al
4Re phases had negligible solubility, and Al
12Re was not observed. Eleven ternary invariant reactions were observed or deduced.