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A model describing the microstructure evolution in Fe-Cu alloys during thermal aging

机译：描述Fe-Cu合金热时效过程中微观组织演变的模型

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摘要

A numerical model treating the full course of precipitation as a concomitant process has been presented to calculate directly the time evolution of the precipitate size distribution during aging of Fe-Cu alloys. The model was first validated by comparing with the reported experimental results and then used to investigate the microstructure evolution during aging of a Fe-1.34at.%Cu alloy in details. It has been demonstrated that the heating process only affects the nucleation period. After the beginning of the bcc →9R transformation, the microstructure evolution can be divided into three stages: bcc →9R transformation, no transformation and 9R →bcc transformation. In the late stage of aging, almost all particles are of 9R structure. The mean particle radius varies linearly with the cube root of time and the particle number density varies linearly with the reciprocal of time.
机译：提出了将析出全过程作为伴随过程的数值模型，以直接计算Fe-Cu合金时效过程中析出物尺寸分布的时间演变。该模型首先通过与所报告的实验结果进行比较而得到验证，然后用于详细研究Fe-1.34at。％Cu合金在时效过程中的组织演变。已经证明加热过程仅影响成核时间。 bcc→9R转变开始后，微观结构演变可分为bcc→9R转变，无转变和9R→bcc转变三个阶段。在老化的后期，几乎所有的颗粒都是9R结构。平均粒子半径随时间的立方根线性变化，而粒子数密度随时间的倒数线性变化。

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