Abstract
Previously, stacking faults have been observed in ordered nickel-base alloys with a b.c.c. type structure (1,2). Ball (1) found an unusual fault in non-stoichiometric Al-rich NiAl, and proposed it was produced by a double layer of vacancies. The present study now reveals a new type of extrinsic fault in heat treated Al-rich non-stoichiometric Ni2AlTi. This alloy has the atomic composition 50% Ni, 30% Al, and 20% Ti. It is relevant to mention that diffuse contrast faults of the type previously described (2) occur in as-cast material prior to heat treatment. In general these faults were non-crystallographic, and had a convoluted appearance. However, after heat treatment at 1000°C for 48 hrs. in vacuo (∼10-7torr) a new type of fault was observed.
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