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Effect of overlapping direction in multipass friction stir processing

机译：重叠方向在多道次摩擦搅拌加工中的影响

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摘要

This paper aims to study the effect of overlapping direction in multipass friction stir processing (FSP). An AA 5083-H111 alloy 8 mm thick was tested. Structural and mechanical differences were observed when overlapping by the advancing side (AS) direction or by the retreating side (RS) one. The surface morphol ogy was analysed and the processed zone was observed by optical microscopy, hardness measurements and bending tests were performed to evaluate surface ductility. Overlapping by the retreating side was found to generate smoother surfaces, while overlapping by the advancing side led to more uniform thick ness layers. Hardness within the processed layer increased by 8.5% and was seen to be approximately constant between passes. The mechanical resistance and toughness under bending were improved by 18% and 19%, respectively.
机译：本文旨在研究重叠方向在多道次摩擦搅拌加工（FSP）中的影响。测试了厚度为8 mm的AA 5083-H111合金。当在前进侧（AS）方向或在后退侧（RS）方向重叠时，观察到结构和机械差异。分析了表面吗啡形貌并通过光学显微镜观察了加工区域，进行了硬度测量和弯曲测试以评估表面延展性。发现后退侧的重叠会产生更光滑的表面，而前进侧的重叠会导致更均匀的厚度层。加工层内的硬度提高了8.5％，并且在两次通过之间大致保持恒定。弯曲时的机械阻力和韧性分别提高了18％和19％。

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