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A Localized Soft Mode Theory for Martensitic Transformations
Author(s) -
Clapp P. C.
Publication year - 1973
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220570213
Subject(s) - spinodal , anharmonicity , nucleation , soft modes , instability , materials science , diffusionless transformation , condensed matter physics , elastic energy , lattice (music) , martensite , strain energy , thermodynamics , physics , microstructure , mechanics , phase (matter) , metallurgy , quantum mechanics , optoelectronics , ferroelectricity , dielectric , acoustics , finite element method
Anharmonic terms of the elastic free energy of a solid are used to locate a surface of instability or “strain spinodal”. The strains near lattice defects bring some regions close to the strain spinodal causing a rapid change in local elastic properties and resulting in localized “soft mode” centers. These regions are proposed as the primary nucleation sites for martensitic transformations. A number of experiments are proposed to test the physical aspects of the theory and some recent evidence is cited supporting several features of the model.