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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure, Thermal Stability during Creep and Fractography Study of Friction-Stir-Processed AA2024-T3 Aluminum Alloy
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Microstructure, Thermal Stability during Creep and Fractography Study of Friction-Stir-Processed AA2024-T3 Aluminum Alloy

机译：微观结构，搅拌加工AA2024-T3铝合金蠕变和断裂研究期间的热稳定性

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摘要

Friction stir processing (FSP) makes it possible to obtain a stir zone with very fine grain size with the aid of severe plastic deformation. Yet using FSP, it is impossible to obtain a uniform cross section as far as the microstructure and mechanical properties are concerned. To reduce the effect of this limitation, in the current study, the material was processed on both sides, thus yielding a wider, rectangular and more homogenous stir zone. In a recent publication, the authors focused on the mechanical properties, thermal stability and transmission electron microscopy (TEM) study of friction-stir-processed AA2024-T3, comparing this alloy to the parent material. While the previous study mentioned focused on the parent and on the as friction-stir-processed material, the current study focuses on post-creep specimens and hence completes the previous one with microstructural processes occurring during creep. The current paper completes the above precipitate analysis using electron-dispersive x-ray spectroscopy (EDS) mapping of the various precipitates reported after exposure to creep temperatures. The TEM study reported in the current paper revealed the formation of dislocation structures during creep, in parallel to the dynamic recrystallization (DRX) reported by the authors in the past. In addition, fractography study indicated premature cracking as the prevailing failure mechanism as well as in the case of friction stir welded creep specimens.
机译：摩擦搅拌加工（FSP）使得借助于严重的塑性变形，可以获得具有非常细的晶粒尺寸的搅拌区。然而，使用FSP，就微观结构和机械性能而言，不可能获得均匀的横截面。为了减少这种限制的效果，在目前的研究中，将材料在两侧加工，从而产生较宽，矩形和更均匀的搅拌区。在最近的出版物中，作者集中于机械性能，热稳定性和透射电子显微镜（TEM）研究摩擦搅拌加工的AA2024-T3，将该合金与母材进行比较。虽然先前的研究在父母上集中于父母和作为摩擦搅拌的材料，但目前的研究侧重于蠕变后的样本，因此完成了在蠕变期间发生的微观结构过程的前一个。目前纸张通过在暴露于蠕变温度后报告的各种沉淀物的映射完成上述沉淀分析。目前报告的TEM研究显示，在过去报道的作者报告的动态再结晶（DRX）并行地揭示了脱位结构的形成。此外，Fractography Choles表明，随着现行的破坏机制以及摩擦搅拌焊接蠕变样品的情况表明过早裂缝。

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