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Microstructure and mechanical properties of friction stir spot welded AA5052-H112 aluminum alloy

机译:摩擦搅拌点焊接AA5052-H112铝合金的微观结构和力学性能

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摘要

The influences of the pin geometry and rotational speed on the microstructure evolution and mechanical properties of the AA 5052-H112 FSSW joint were investigated. Results showed that hook height and fully bonded region (FBR) width were significantly dependent by both pin geometry and rotational speeds. Both pin geometry and tool rotational speed had an apparent influence on the strength of the weld. At 900 and 1400 rpm, the strength of welds prepared using a cylindrical pin was higher compared to that of a step pin. For the step pin, the cross-tension strength of the welds increased as rotational speed increased. For cylindrical pin, the tensile/shear and cross-tension loads achieved the maximum values of 3589 and 3419 N at 1400 rpm, respectively. Under tensile/shear loading, shear and tensile/shear fractures were observed. On the other hand, under cross-tension loading, two types of fracture modes, namely nugget debonding and nugget pull-out were detected.
机译:研究了销几何形状和转速对AA 5052-H112 FSSW接头的微观结构演化和力学性能的影响。结果表明,钩子高度和完全粘合区域(FBR)宽度通过引脚几何和转速显着取决于销。销几何和刀具转速都对焊缝强度有明显影响。在900和1400rpm处,与步进销相比,使用圆柱销制成的焊缝强度较高。对于步进销,随着旋转速度增加,焊缝的交叉张力强度增加。对于圆柱形销,拉伸/剪切和交叉张力载荷分别以1400rpm分别实现了3589和3419n的最大值。在拉伸/剪切负载下,观察剪切和拉伸/剪切裂缝。另一方面,在交叉张力载荷下,检测到两种类型的骨折模式,即核果剥离和掘金拉出。

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