Two modes of grain boundary pinning by coherent precipitates

被引：65

作者：

Wang, Nan ^{[1
,2
]}

Ji, Yanzhou ^{[2
]}

Wang, Yongbiao ^{[2
]}

Wen, Youhai ^{[3
]}

Chen, Long-Qing ^{[2
]}

机构：

[1] McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada

[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[3] Natl Energy Technol Lab, Albany, OR 97321 USA

来源：

ACTA MATERIALIA | 2017年 / 135卷

关键词：

Grain growth; Grain boundary; Coherent precipitate; Particle pinning; Phase-field-crystal model; AL-SC ALLOY; PHASE-FIELD; ZENER DRAG; 2ND-PHASE PARTICLES; MG-SI; GROWTH; RECRYSTALLIZATION; SIMULATIONS; SUPERALLOY; BEHAVIOR;

D O I：

10.1016/j.actamat.2017.06.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose a two-mechanism theory to estimate the pinning effect of coherent precipitates on grain boundary (GB) migration in grain growth, taking into account the important effect of elastic misfit strain at the coherent interface. Depending on the relative importance of the elastic and the GB contributions to the total free energy, Zener type stabilization or a novel elastic energy induced stabilization may occur. It is found that the pinning is most effective in the crossover region between these two mechanisms. A phase-field-crystal model is used to numerically validate the theory. Relevant experiments and potential impacts on alloy design are also discussed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：226 / 232

页数：7

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