A new ordered orthorhombic phase in a Ti3Al-Nb alloy

Banerjee, D. ; Gogia, A. K. ; Nandi, T. K. ; Joshi, V. A. (1988) A new ordered orthorhombic phase in a Ti3Al-Nb alloy Acta Metallurgica, 36 (4). pp. 871-882. ISSN 0001-6160

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0001-6160(88)90141-1


An ordered orthorhombic phase has been detected in a Ti-25at.% Al-12.5at.%Nb alloy which is one of a family of Ti3Al base alloys under development for high temperature applications. Convergent beam electron diffraction and channelling enhanced microanalysis have been used to assign a space group to the structure and determine atomic positions. The ordered orthorhombic phase has a Cmcm symmetry and is isomorphous to the NaHg type of structure. Preliminary studies on the effect of heat treatment on the formation of this new phase suggest that the Ti3Al free-energy composition curve develops an inflection at low temperatures with Nb addition leading to a phase separation reaction in which the Nb rich component has the orthorhombic symmetry.

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ID Code:62981
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