Weldability, microstructure evolution and tensile strength of an aluminium alloy (AA6082) and of two category of composites with AA6082 matrix reinforced with Si₃N₄ and SiC particles during friction stir welding (FSW) were investigated. 5, 10 and 15 weight percentage of reinforced particle were used in each category. FSW was carried out as per the parameters selected by Taguchi L-9 orthogonal Array. Microstructure of nugget region was investigated by scanning electron microscopy (SEM) and EDS analysis. Effect of tool rotational speed, welding speed and tool tilt angle on tensile strength was also investigated. The optimum parameters to get maximum ultimate tensile strength (UTS) for AA6082/SiC and AA6082/ Si₃N₄ composites were found out. On one hand, SiC particles are fractured thus fined due to intensive stirring action during FSW. On the other hand, the plastic flowing of material in the weld is benefit to eliminate microporocities existed in original base material. The highest tensile strength of 193 MPa was obtained for AA6082/15 wt% Si₃N₄ composite, at tool rotation speed of 1950 rpm at fixed welding speed of 40 mm/min and fixed tool tilt angle of 2°. Hard Si₃N₄ particles transfer their strength to the AA6082 matrix by their strengthening mechanism. This happens because of load transfer from Si₃N₄ particles to AA6082 matrix.

中文翻译：

---

搅拌摩擦焊接AA6082 / Si 3 N 4和AA6082 / SiC复合材料接头最大抗拉强度的参数优化

研究了铝合金（AA6082）以及两类具有搅拌摩擦焊（FSW）的Si ₃ N ₄和SiC颗粒增强的AA6082基复合材料的复合材料的焊接性，组织演变和拉伸强度。在每个类别中使用5、10和15重量百分比的增强颗粒。FSW根据Taguchi L-9正交阵列选择的参数进行。通过扫描电子显微镜（SEM）和EDS分析研究了熔核区的微观结构。还研究了工具转速，焊接速度和工具倾斜角对拉伸强度的影响。获得AA6082 / SiC和AA6082 / Si ₃ N _4的最大极限抗拉强度（UTS）的最佳参数复合材料被发现。一方面，由于FSW期间强烈的搅拌作用，SiC颗粒破裂从而被细化。另一方面，焊缝中材料的塑性流动有利于消除原始基材中存在的微孔。对于AA6082 / 15 wt％Si ₃ N ₄复合材料，在1950 rpm的工具旋转速度，40 mm / min的固定焊接速度和2°的固定工具倾斜角下，可获得最高的193 MPa拉伸强度。坚硬的Si ₃ N ₄颗粒通过其强化机制将其强度传递给AA6082基体。发生这种情况是由于负载从Si ₃ N ₄颗粒转移到AA6082基体。