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Titolo:
A micromechanical model of phase boundary movement during solid-solid phase transformations
Autore:
Fischer, FD; Oberaigner, ER;
Indirizzi:
Montan Univ, Inst Mech, A-8700 Leoben, Austria Montan Univ Leoben Austria A-8700 niv, Inst Mech, A-8700 Leoben, Austria
Titolo Testata:
ARCHIVE OF APPLIED MECHANICS
fascicolo: 2-3, volume: 71, anno: 2001,
pagine: 193 - 205
SICI:
0939-1533(200103)71:2-3<193:AMMOPB>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
CU-AL-NI; NUCLEATION; KINETICS;
Keywords:
phase transformation; driving force; moving boundary;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Fischer, FD Montan Univ, Inst Mech, Fronz Josef Str 18, A-8700 Leoben, Austria Montan Univ Fronz Josef Str 18 Leoben Austria A-8700 Austria
Citazione:
F.D. Fischer e E.R. Oberaigner, "A micromechanical model of phase boundary movement during solid-solid phase transformations", ARCH APPL M, 71(2-3), 2001, pp. 193-205

Abstract

Understanding the kinetics of phase boundary movement is of major concern in e.g. martensitic transformation in related engineering applications. Themain goal of this paper is to develop such kinetics on the basis of thermodynamic principles at the material microlevel. After a short literature survey in the introduction, the jump condition and thermodynamic force on the interface are discussed based on laws of conservation and thermodynamics. This leads to a relation for the driving force of the transformation front. In particular, the propagating front of a phase-transforming sphere within an elastic-plastic medium is considered. Due to density change, which is implicitly expressed in the transformation volume strain, strains and accompanying stresses are induced which hamper the propagation and influence the transformation kinetics. Together with the latent heat, the heat due to plastic dissipation occurs as a source term in the heat conduction equation. Since kinetics are influenced by temperature, the heat conduction equation and the kinetics equation are coupled. Using Green's function techniques, an integral equation is derived and solved numerically. The results of a parameter study are discussed.

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Documento generato il 14/07/20 alle ore 12:47:59