Phase field microelasticity model of dislocation climb: Methodology and applications

التفاصيل البيبلوغرافية
العنوان: Phase field microelasticity model of dislocation climb: Methodology and applications
المؤلفون: J.H. Ke, A. Boyne, Yunzhi Wang, C. R. Kao
المصدر: Acta Materialia. 79:396-410
بيانات النشر: Elsevier BV, 2014.
سنة النشر: 2014
مصطلحات موضوعية: Dislocation creep, Materials science, Polymers and Plastics, Field (physics), Deformation (mechanics), Kirkendall effect, Condensed matter physics, Metals and Alloys, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Crystallography, Vacancy defect, Reaction–diffusion system, Ceramics and Composites, Climb, Dislocation
الوصف: We develop a dislocation climb model based on a phase field description that couples non-conservative dislocation motion and vacancy diffusion. A reaction–diffusion model is incorporated where vacancy transport is governed by the Cahn–Hilliard equation, while the binding of vacancies to dislocation cores is described as adsorptive reaction. The model extends the previously developed phase field microelasticity theory of dislocations to consider the osmotic force associated with non-equilibrium vacancy concentration. We first present quantitative validations of diffusion-controlled and quasi-steady-state dislocation climb with and without dislocation–vacancy interaction. The capability of the model is then demonstrated by simulations of Nabarro diffusional creep and the Kirkendall effect, both showing excellent agreement with classical descriptions of dislocation climb plasticity and interdiffusion. Straightforward applications to irradiation and climb-dominated deformation of crystals are possible, as long as multiple climb systems and vacancy thermodynamic databases are taken into account.
تدمد: 1359-6454
DOI: 10.1016/j.actamat.2014.07.003
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::43f9de7e61f9b3db327621aab8467860
https://doi.org/10.1016/j.actamat.2014.07.003
Rights: CLOSED
رقم الانضمام: edsair.doi...........43f9de7e61f9b3db327621aab8467860
قاعدة البيانات: OpenAIRE
الوصف
تدمد:13596454
DOI:10.1016/j.actamat.2014.07.003