Revisiting the Theory of Spinodal Strengthening: Implications for Inhomogeneous Additive and Irradiated Structural Alloys

Riccardo Civiero, Anter El-Azab
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Abstract

Composition fluctuations are commonly observed in additive manufactured alloys, high entropy alloys and irradiated alloys. These fluctuations, which arise due to thermodynamic and/or kinetic factors, influence the mechanical strength of alloys. The classical theory of spinodal strengthening in alloys with coherency stress arising due to the spinodal long-range composition fluctuations has been developed by Cahn, Kato and others. We present the motivations for revisiting Cahn’s theory to account for the concurrent solid solution strengthening in spinodally strengthened alloys by taking into consideration the effect of the solute friction along with the internal coherency stress. We briefly expose the model we developed to achieve the aforementioned aim and discuss some findings.
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重新审视旋压强化理论:非均质添加剂和辐照结构合金的影响
添加剂制造的合金、高熵合金和辐照合金中通常会出现成分波动。这些波动是由热力学和/或动力学因素引起的,会影响合金的机械强度。Cahn 和 Kato 等人提出了合金中的旋光强化经典理论,由于旋光长程成分波动而产生了相干应力。我们介绍了重新审视 Cahn 理论的动机,即通过考虑溶质摩擦和内部相干应力的影响,解释旋光强化合金中同时存在的固溶强化。我们简要介绍了为实现上述目标而开发的模型,并讨论了一些发现。
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