Abstract
Alloys of composition Ti2AlNb and Ti4AlNb3, cooled from 1400°C and equilibrated at 700°C for 26 days, were both found to consist of two phases: the Ti- and Nb-rich b.c.c. phase and the orthorhombic phase based on Ti2AlNb. Depending on the alloy composition, each phase was observed as a precipitate with a plate morphology in the matrix of the other phase. In both cases the phases share a common direction, [011]b.c.c. | [001]ort, and interface (habit) plane, (211)b.c.c. | (110)ort. Geometrical patterns of plates of the different orientational variants were also observed. Analysis of the orientation relation, habit plane and plate patterns are consistent with the concept of a strain-type transition even though long range diffusion is required.
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