论文标题
金属合金中沉淀强化的通用线张力模型
A generalized line tension model for precipitate strengthening in metallic alloys
论文作者
论文摘要
已经开发了广义线张力模型，以估计沉淀硬合金中的关键分辨剪切应力。该模型基于先前的线张力模型，用于无法穿透的或可剪切的球形沉淀物的常规阵列，这些阵列已扩展，以考虑矩阵和沉淀物之间的弹性不匹配的效果。模型参数是通过脱位动力学模拟校准的，这些模拟涵盖了宽阔的沉淀直径和间距以及弹性常数中的不匹配。该模型的扩展为处理单分散球形沉淀的随机阵列，通过通过对应于随机分布的平均值来更改模型的几何参数。该模型预测与从不可穿透和可剪切的沉淀物的随机球形沉淀分布中获得的临界分辨剪切应力非常吻合，从而提供了一种快速准确的工具，以预测金属合金中的降水量增强。
A generalized line tension model has been developed to estimate the critical resolved shear stress in precipitation hardened alloys. The model is based in previous line tension models for regular arrays of either impenetrable or shearable spherical precipitates that were expanded to take into account the effect of the elastic mismatch between the matrix and the precipitates. The model parameters are calibrated from dislocation dynamics simulations that covered a wide range of precipitate diameters and spacing as well as of the mismatch in elastic constants. This model is extended to deal with random arrays of monodisperse spherical precipitates by changing the geometrical parameters of the model by the averaged ones corresponding to the random distributions. The model predictions were in good agreement with the critical resolved shear stresses obtained from dislocation dynamics simulations of random spherical precipitates distributions for both impenetrable and shearable precipitates, providing a fast and accurate tool to predict precipitate strengthening in metallic alloys.
