The A l-N i phase diagram has been investigated in the com position range x Ni = 0.70 to 0.97. Phase boundaries were determined by using differential thermal analysis and Knudsen effusion mass spectrometry. The measurements were carried out in the temperature range between 1409 and 1730K. An A l-N i phase diagram is obtained for x Ni Si 0.70 by com bining the data from this work with selected data from the literature. This diagram deviates from that recommended by phase diagram compilations and used generally in the literature to date; it agrees reasonably well with a diagram which has been rejected in the literature. + On leave from: Fuel Chemistry D ivision,

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