A comparative study of the theory of the O-lattice and the phenomenological theory of martensite crystallography to phase transformations
- Tsinghua Univ. (China). Dept. of Materials Science and Engineering
- McMaster Univ., Hamilton, Ontario (Canada). Brockhouse Inst. for Materials Research
The approaches of the phenomenological theory of martensite crystallography (PTMC) and the theory of the O-lattice (TOL) to describe the elements of a phase transformation are compared for an O-line transformation strain. A number of simple relationships between the O-lattice treatment and the PTMC have been established. The displacement associated with the long range strain component is shown to be identical in both treatments when the planes defined by the path of the O-lines are correlated to the slip plane of the dislocations. A characteristic feature of the TOL approach is that this displacement is allowed to vary for a fixed habit plane. When the displacement is associated with an interfacial step, it is equivalent to a transformation dislocation, whose Burgers vector is explicitly expressed in terms of a D-lattice vector in the TOL formula. This method is extended to consider the tilt or tent-shaped surface relief effects observed at precipitates in a Ti-Cr alloy. Good agreement is found between the predictions of this approach and the measurements reported in the literature.
- OSTI ID:
- 616241
- Journal Information:
- Acta Materialia, Vol. 46, Issue 6; Other Information: PBD: 23 Mar 1998
- Country of Publication:
- United States
- Language:
- English
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