A comprehensive dynamical study of nucleation and growth in a one- dimensional shear martensitic transition
| Autor: | R. J. Gooding, B. P. van Zyl |
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| Rok vydání: | 1996 |
| Předmět: |
Phase transition
Materials science Condensed Matter (cond-mat) Metals and Alloys Nucleation FOS: Physical sciences Thermodynamics Crystal growth Condensed Matter Condensed Matter Physics Condensed Matter::Materials Science Mechanics of Materials Diffusionless transformation Martensite Boundary value problem Crystal twinning Phase diagram |
| Zdroj: | Metallurgical and Materials Transactions A. 27:1203-1216 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/bf02649858 |
| Popis: | We have constructed a complete hydrodynamic theory of nucleation and growth in a one--dimensional version of an elastic shear martensitic transformation with open boundary conditions where we have accounted for interfacial energies with strain--gradient contributions. We have studied the critical martensitic nuclei for this problem: Interestingly, the bulk critical nuclei are {\em twinned} structures, although we have determined that the dominant route for the formation of martensite is through {\em surface nucleation}. We have analytically solved for the surface nuclei and evaluated exact nucleation rates showing the strong preference for surface nucleation. We have also examined the growth of martensite: There are two possible martensitic growth fronts, {\em viz}., dynamical twinning and so-called two--kink solutions. These transformation fronts are separated by a {\em dynamical} phase transition. We analytically derive this phase diagram and determine expressions for the speeds of the martensitic growth fronts. 17 Postscript figures, to appear in Met. Trans A |
| Databáze: | OpenAIRE |
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