J. Phys. IV France 112 (2003) 111
A model of martensite formation in terms of interfacial defect mechanismsR.C. Pond1, S. Celotto1 and J.P. Hirth2
1 Materials Science and Engineering, Department of Engineering, University of Liverpool, Brownlow Hill, Liverpool L69 3BX, U.K.
2 114 Ramsey Canyon Rd., Hereford, AZ 85615, U.S.A.
The objective of this work is to demonstrate the consistency between a new model of martensite formation and the classical theory of martensite crystallography. Recent developments in the understanding of interfacial defects have enabled their topological character, i.e. Burgers vectors and step heights, to be defined rigorously. In addition, the material flux associated with their motion along an interphase interface has also been quantified. On this basis, a defect model has been developed in which an initially strained nucleus evolves via a diffusionless process into a martensite plate. A bcc to hcp transformation is illustrated, demonstrating the crystallographic equivalence of the dislocation model and the phenomenological theory.
© EDP Sciences 2003