The constitution of the Ni-Al-Ru system |
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Authors: | S. Chakravorty D. R. F. West |
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Affiliation: | (1) Department of Metallurgy and Materials Science, Imperial College, SW7 2BT London, UK |
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Abstract: | The constitution of the Ni-Al-Ru system has been investigated in the range 0 to 50 at% Al. Isothermal sections at 1523 and 1273 K have been determined using microstructural observations, electron probe microanalysis and X-ray diffraction. The phases present were: nickel-based solid solution (); (based on Ni3Al); solid solutions based on NiAl and RuAl, respectively (designated 1 and 2), and ruthenium-based solid solution (Ru). The maximum solubility of Ru in was 5 at%. 1, and 2 show extensive range of solubilities, namely up to 20at% Ru in 1 and up to 25 to 35 at% Ni in 2. Three-phase equilibrium between , 2 and (Ru) existed at 1523 and 1273 K. Also at 1523 K, three-phase equilibria existed between , and 1 and ,1 and 2, while at 1273 K, the equilibria were between , 1,2 and , , 2 indicating the occurrence of a reaction +1, +2 at a temperature between 1523 and 1273 K. Liquidus features have been deduced from data on as-solidified structures. Lattice parameter data and hardnesses are also reported. |
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