AA2219 Aluminum Alloy Processed via Multi-Axial Forging in Cryogenic and Ambient Environments

A. Azimi, G. Owolabi, H. Fallahdoost, Nikhil Kumar, H. Whitworth, G. Warner
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引用次数: 4

Abstract

This paper presents the microstructure and the mechanical behavior of nanocrystalline AA2219 processed by multi axial forging (MAF) at ambient and cryogenic temperatures. The X-ray diffraction pattern and transmission electron microscopy micrographs in the initial microstructure characterization indicate a more effective severe plastic deformation during the cryogenic MAF than the same process conducted at room temperature. MAF at cryogenic temperature results in crystallite size reduction to nanoscales as well as second phase particles breakage to finer particles which are the crucial factors to increasing the mechanical properties of the material. Fractography analysis and tensile tests results show that cryogenic forging does not only increase the mechanical strength and toughness of the alloys significantly, but also improves the ductility of the material in comparison with the conventional forging. In this comparative regard, cryogenic processing provides 44% increase in the tensile strength of the material only after 2 forging cycles when compared to the room temperature process. In addition, further forging process to the next cycles slightly enhances the tensile strength at the expense of ductility due to less ability of the dislocations to accumulate. However, the ductility of the ambient temperature forged samples decreases at a faster rate than that of cryoforged samples.
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低温环境下多轴锻造AA2219铝合金
研究了常温和低温下多轴锻造纳米晶AA2219的显微组织和力学行为。初始微观结构表征的x射线衍射图和透射电镜显微图表明,在低温MAF过程中比在室温下进行相同的过程更有效的剧烈塑性变形。低温MAF使材料的晶粒尺寸减小到纳米级,并使第二相颗粒破碎成更细的颗粒,这是提高材料力学性能的关键因素。断口分析和拉伸试验结果表明,与常规锻造相比,低温锻造不仅显著提高了合金的机械强度和韧性,而且材料的延展性也得到了改善。在这方面,与室温工艺相比,低温工艺仅在2个锻造循环后就能使材料的抗拉强度提高44%。此外,进一步的锻造过程到下一个循环略有提高抗拉强度,但代价是延性,由于位错积累的能力较低。常温锻造试样的塑性下降速度比低温锻造试样快。
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