Abstract
The region of the Ni-Al phase diagram close to the Ni{sub 3}Al ({gamma}{prime}) compound has been analyzed several times recognizing that {gamma}{prime} has an incongruent melting and its field of existence is narrow, bounded by the equilibria with the {gamma} terminal solid solution and the NiAl ({beta}) phase. With the availability of High Temperature Differential Scanning Calorimetry (HTDSC) as a sensitive technique for quantitative thermal analysis, it appeared useful to re-examine the portion of the phase diagram around {gamma}{prime}. In this paper the authors report data confirming Hilpert`s version of the phase diagram. In addition, the HTDSC analysis provides information on the enthalpy change during fusion not yet available in the literature, which also has implications in the analysis of the order-disorder transition in Ni{sub 3}Al. Furthermore, a detailed knowledge of the DSC behaviour of these alloys on melting and solidification is relevant as a reference basis to interpret data on analogous transformations in superalloys and intermetallics.
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