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首页> 外文期刊>Materials Science and Engineering >Physical modeling of the creep response of an Al-Cu-Mg alloy with a fine microstructure transformed by Friction Stir Processing
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Physical modeling of the creep response of an Al-Cu-Mg alloy with a fine microstructure transformed by Friction Stir Processing

机译：摩擦搅拌法加工具有精细组织的Al-Cu-Mg合金蠕变响应的物理模型

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摘要

The creep response of an Al-Cu-Mg 2024 Aluminum alloy with a refined microstructure produced by Friction Stir Processing (FSP) has been investigated. The material, after FSP, exhibited a strong reduction in creep resistance, attested by higher values of the minimum creep rate, when compared with the base metal (the AA2024 in T3 state). A constitutive model based on a theoretical approach has been then used to correlate microstructural features and creep properties. The model was modified to take into account the microstructure of the transformed alloy, with a fine recrystallized grain size and lower mechanical strength. The hardness variation with creep duration was used to quantify the particle strengthening term. The resulting model gave an excellent description of the experimental results, without requiring any data-fitting of the minimum creep rate experimental data. This achievement represents a substantial advantage over conventional approaches based on phenomenological equations.
机译：研究了通过摩擦搅拌加工（FSP）生产的具有精细组织的Al-Cu-Mg 2024铝合金的蠕变响应。与贱金属（处于T3状态的AA2024）相比，经过FSP处理后的材料表现出抗蠕变性的大幅降​​低，这是通过最小蠕变速率的更高值来证明的。然后，基于理论方法的本构模型已用于关联微结构特征和蠕变特性。对模型进行了修改，以考虑到相变合金的微观结构，具有良好的重结晶晶粒尺寸和较低的机械强度。硬度随蠕变持续时间的变化用于量化颗粒强化项。生成的模型可以很好地描述实验结果，而无需对最小蠕变速率实验数据进行任何数据拟合。与基于现象学方程的常规方法相比，该成就代表了一项重大优势。

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