Crystal plasticity finite element modeling of discrete twin evolution in polycrystalline magnesium

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• 作者：Jiahao Cheng^a ; Somnath Ghosh^b ; ^{sghosh20@jhu.edu}
• 关键词：Explicit twin evolution ; Crystal plasticity finite element ; Magnesium ; Subcycling ; Tension-compression asymmetry
• 刊名：Journal of the Mechanics and Physics of Solids
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：99
• 期：Complete
• 页码：512-538
• 全文大小：3413 K
• 卷排序：99

文摘

Develop an image-based crystal plasticity finite element (CPFE) model. Predict explicit twin formation single crystal and polycrystalline microstructures of hcp materials like Mg alloys. Twin nucleation model is based on dissociation of sessile dislocations into stable twin loops. Twin propagation is due to shearing and shuffling of atoms to reduce the thermal activation energy barrier. Subcycling algorithm is developed for accelerating CPFE fine simulations.