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Title: Study of thermoelastic growth during martensitic transformations
Author: Planes Vila, Antoni
Ortín, Jordi, 1959-
Keywords: Ciència dels materials
Equacions d'estat
Regla de les fases i equilibri
Transformacions de fase (Física estadística)
Materials science
Equations of state
Phase rule and equilibrium
Phase transformations (Statistical physics)
Issue Date: 15-Jan-1992
Publisher: American Institute of Physics
Abstract: The possibility of local elastic instabilities is considered in a first¿order structural phase transition, typically a thermoelastic martensitic transformation, with associated interfacial and volumic strain energy. They appear, for instance, as the result of shape change accommodation by simultaneous growth of different crystallographic variants. The treatment is phenomenological and deals with growth in both thermoelastic equilibrium and in nonequilibrium conditions produced by the elastic instability. Scaling of the transformed fraction curves against temperature is predicted only in the case of purely thermoelastic growth. The role of the transformation latent heat on the relaxation kinetics is also considered, and it is shown that it tends to increase the characteristic relaxation times as adiabatic conditions are approached, by keeping the system closer to a constant temperature. The analysis also reveals that the energy dissipated in the relaxation process has a double origin: release of elastic energy Wi and entropy production Si. The latter is shown to depend on both temperature rate and thermal conduction in the system.
Note: Reproducció del document publicat a:
It is part of: Journal of Applied Physics, 1992, vol. 71, núm. 2, p. 950-957
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ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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