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Ductility Improvement of an AZ61 Magnesium Alloy through Two-Pass Submerged Friction Stir Processing

机译:通过两遍浸没式搅拌摩擦加工来改善AZ61镁合金的延展性

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摘要

Friction stir processing (FSP) has been considered as a novel technique to refine the grain size and homogenize the microstructure of metallic materials. In this study, two-pass FSP was conducted under water to enhance the cooling rate during processing, and an AZ61 magnesium alloy with fine-grained and homogeneous microstructure was prepared through this method. Compared to the as-cast material, one-pass FSP resulted in grain refinement and the β-Mg17Al12 phase was broken into small particles. Using a smaller stirring tool and an overlapping ratio of 100%, a finer and more uniform microstructure with an average grain size of 4.6 μm was obtained through two-pass FSP. The two-pass FSP resulted in a significant improvement in elongation of 37.2% ± 4.3%, but a slight decrease in strength compared with one-pass FSP alloy. Besides the microstructure refinement, the texture evolution in the stir zone is also considered responsible for the ductility improvement.
机译:摩擦搅拌处理(FSP)被认为是一种新的技术,可以细化晶粒尺寸并使金属材料的微观结构均匀化。在这项研究中,在水中进行两次通过的FSP以提高加工过程中的冷却速度,并通过这种方法制备了具有细晶粒和均匀组织的AZ61镁合金。与铸态材料相比,单程FSP导致晶粒细化,β-Mg17Al12相破碎成小颗粒。使用较小的搅拌工具和100%的重叠率,通过两次通过FSP获得了平均粒度为4.6μm的更细,更均匀的显微组织。与单道次FSP合金相比,两次道次FSP导致伸长率显着提高37.2%±4.3%,但强度略有下降。除了微结构的细化外,搅拌区的组织演变也被认为有助于延展性的提高。

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