Phase-field modeling of the 纬鈥?coarsening behavior in Ni-based superalloys

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• 作者：J. Kundin^a ; ^{julia.kundin@uni-bayreuth.de} ; L. Mushongera^a ; ; T. Goehler^b ; H. Emmerich^a
• 关键词：Phase transformation ; Diffusion ; Coarsening ; Elastic behavior ; Phase-field modeling
• 刊名：Acta Materialia
• 出版年：2012
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：May, 2012
• 卷：60
• 期：9
• 页码：3758-3772
• 文件大小：1912 K

摘要

Microstructural changes during heat treatment of the Ni-based CMSX-4 and CMSX-6 superalloys have been investigated experimentally and simulated using a phase-field multi-component model incorporating elastic driving forces in the presence of a lattice misfit. Furthermore, a theoretical model of the coarsening of anisotropic particles is proposed for the prediction of the main kinetic parameters of the coarsening process. A comparison of the main characteristics of the microstructural evolution during non-directional 纬鈥?coarsening, provided from both experiments and phase-field simulations, gives a good agreement of the coarsening kinetics of the CMSX-4 superalloy. However, for the CMSX-6 superalloy, phase-field simulation results and theoretical predictions are not entirely consistent with experimental results, and show that additional effects, for example, those caused by plastic deformation, might be a reason for the slow coarsening rate.