Abstract
An ordering reaction has been observed in the nickel-rich binary alloys of the Ni−Ta system that are aged below 570°C following quenching from elevated temperatures. This reaction has been investigated by employing electron diffraction microscopy, X-ray diffraction, and electrical resistivity techniques. The ordered phase has been identified as Ni8Ta and its structure is identical to that of the Ni8Nb (Cb) reported earlier. In the stoichiometric Ni8Ta alloy (Ni-11.1 at. pct Ta) three variants of the Ni8Ta phase are nucleated apparently “homogeneously” throughout the matrix. The precipitate or domain morphology has been identified as a cuboid elongated in one direction such that the cube faces are parallel to the {100} planes of the matrix. The cuboid morphology of the precipitates tends to disappear as the precipitates coalesce and the particle size approaches 1000A.
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