Constitution of the Ni3Cr-Ni3Al-Ni3W system |
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| Authors: | S. Chakravorty S. Sadiq D. R. F. West |
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| Affiliation: | (1) Department of Materials, Imperial College of Science and Technology, SW7 2BP London, UK;(2) Present address: Division of Materials Applications, National Physical Laboratory, Teddington, UK;(3) Present address: Pakistan Space and Upper Atmosphere Research Commission, Karachi, Pakistan |
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| Abstract: | Isothermal sections of the Ni-Cr-Al-W system have been investigated at 75 at % Ni and temperatures of 1523 and 1273 K, by means of phase compositional analysis, X-ray diffraction and microscopical examination. The alloys studied lay in the range 2.5 to 10 at % Cr, 12.5 to 20 at% Al, 2.5 to 6.25 at % W, The phases formed were ,  and the bcc solid solution based on tungsten (designated 2). The maximum extent of the region was found to be  3 at % each of chromium and tungsten. Preferential partitioning of tungsten to occurred. Study of an Ni-10Cr-12.5Al-2.5W alloy aged at 1273 and 1073 K, after quenching from 1573 K, showed that changes in and compositions and lattice parameters occur as a function of ageing time. |
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