Phase field study of acicular growth: Role of elasticity in Widmanstätten structure
Phase field study of acicular growth: Role of elasticity in Widmanstätten structure
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DOI：
10.1016/j.actamat.2014.03.045
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发表时间：
2014-06
期刊：
影响因子：
9.4
通讯作者：
M. Cottura;B. Appolaire;A. Finel;Y. Bouar
中科院分区：
文献类型：
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作者：
M. Cottura;B. Appolaire;A. Finel;Y. Bouar
发展了一个考虑非均匀各向异性弹性的相场模型来研究针状析出物的生长。在等温条件下，研究了各向异性相变本征应变产生的弹性应力作用下，孤立析出相的扩散控制生长。结果表明，弹性各向异性从本质上改变了生长机制，可以达到一个稳定的区域。根据这些结论，分析了几种具有Widmanstätten结构的金属合金的弹性各向异性。由我们的分析预测的生长区域与实验观察一致；这强烈地表明了弹性各向异性在这些微结构的形成中的首要重要性。
A phase field model accounting for inhomogeneous and anisotropic elasticity has been developed to study the growth of acicular precipitates. The diffusion-controlled growth of an isolated precipitate is investigated in the presence of elastic stresses generated by anisotropic transformation eigenstrains in isothermal conditions. It is shown that elastic anisotropy qualitatively changes the growth mechanisms and that a stationary regime may be reached. In light of these conclusions, the elastic anisotropies of several metallic alloys featuring Widmanstätten structures are analyzed. The growth regimes predicted by our analysis are consistent with experimental observations; this strongly suggests the primary importance of elastic anisotropy in the formation of these microstructures.