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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Investigating the effects of traveling speeds and post-weld heat treatment on mechanical properties of nano-Al_2O_3-fortified AA6061-T6 friction stir welds
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Investigating the effects of traveling speeds and post-weld heat treatment on mechanical properties of nano-Al_2O_3-fortified AA6061-T6 friction stir welds

机译：研究行进速度和焊后热处理对纳米Al_2O_3-强化AA6061-T6摩擦搅拌焊缝力学性能的影响

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摘要

In this study, 6 mm thick AA6061-T6 plates were friction stir welded (FSWed) at different traveling speeds while Al2O3 nano-particles were incorporated between adjoining plates. The solution heat treatment was applied on samples for one hour at 540 degrees C and subsequently aged for 18 h at 180 degrees C to investigate the effect of post-weld heat treatment on mechanical properties of specimens. All joints were investigated macro- and micro-structurally. The microstructural characterization of the FSWed samples was carried out using scanning electron microscopy (SEM) and light microscopy techniques. Distribution of Al2O3 nano-particles in the stir zone was studied by SEM. The specimen FSWed at 40 mm/min exhibited the most homogeneous particles distribution. Tensile properties including ultimate tensile strength, elongation, and fracture surfaces were studied. Microhardness of specimens was also investigated. Surprisingly, all specimens exhibited inferior hardness compared to the as-received AA6061-T6 alloy. This phenomenon was attributed to the dissolution of precipitates during FSW process.
机译：在这项研究中，将Al2O3纳米颗粒掺入相邻的板之间，并以不同的行进速度将6 mm厚的AA6061-T6板进行摩擦搅拌焊接（FSWed）。固溶热处理在540摄氏度下对样品进行1小时，然后在180摄氏度下老化18小时，以研究焊后热处理对试样力学性能的影响。所有关节都进行了宏观和微观结构研究。 FSWed样品的显微结构表征是使用扫描电子显微镜（SEM）和光学显微镜技术进行的。通过SEM研究了Al2O3纳米颗粒在搅拌区的分布。以40 mm / min的速度FSWed的样品表现出最均匀的颗粒分布。研究了包括极限拉伸强度，伸长率和断裂表面在内的拉伸性能。还研究了样品的显微硬度。出乎意料的是，与原样的AA6061-T6合金相比，所有样品的硬度均较差。该现象归因于FSW过程中沉淀物的溶解。

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