Electronic Resource
Continuum Model and Numerical Method for Dislocation Structure and Energy of Grain Boundaries
| العنوان: | Continuum Model and Numerical Method for Dislocation Structure and Energy of Grain Boundaries |
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| المؤلفون: | Qin, Xiaoxue, Gu, Yejun, Zhang, Luchan, Xiang, Yang |
| بيانات النشر: | 2022 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | We present a continuum model to determine the dislocation structure and energy of low angle grain boundaries in three dimensions. The equilibrium dislocation structure is obtained by minimizing the grain boundary energy that is associated with the constituent dislocations subject to the constraint of Frank's formula. The orientation-dependent continuous distributions of dislocation lines on grain boundaries are described conveniently using the dislocation density potential functions, whose contour lines on the grain boundaries represent the dislocations. The energy of a grain boundary is the total energy of the constituent dislocations derived from a discrete dislocation dynamics model, incorporating both the dislocation line energy and reactions of dislocations. The constrained energy minimization problem is solved by the augmented Lagrangian method and projection method. Comparisons with atomistic simulation results show that our continuum model is able to give excellent predictions of the energy and dislocation densities of both planar and curved low angle grain boundaries. |
| مصطلحات الفهرس: | Article |
| URL: | |
| الاتاحة: | Open access content. Open access content |
| ملاحظة: | English |
| Other Numbers: | HNK oai:repository.hkust.edu.hk:1783.1-116360 Multiscale modeling & simulation, v. 20, (1), March 2022, p. 323-348 1540-3459 https://doi.org/10.1137/20M1366782 1331260689 |
| المصدر المساهم: | HONG KONG UNIV OF SCI & TECH, THE From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.on1331260689 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |