采用不同的相邻道次搅拌头位移量对7B04-O铝合金进行三道次搅拌摩擦加工,相邻道次的搅拌头位移量分别采用传统方式(50%搅拌针直径)和新方式(50%搅拌轴肩直径).搅拌摩擦加工引起晶粒和第二相粒子细化,加工区力学性能提高,硬度提高HV40,拉伸性能也较母材提高了40%.在加工区内部存在性能弱区,其位置受相邻道次搅拌头位移量影响,当采用传统方式的搅拌头位移量时,性能弱区为先前加工道次,而采用新方式时,性能弱区为过渡区.利用新方式制备细晶加工区时,可以通过提高搅拌头旋转速度限制性能弱区.
Three-pass friction stir processing (FSP) with different moving distances of the stirring tool between the two successive passes, 50% diameter of the pin (traditional way) and 50% diameter of the shoulder (novel way), was conducted on 7B04-O Al alloy. The result shows that an improvement in the mechanical properties of the processed zone is accomplished due to grain and second phase particles refinement. The hardness of the multi-pass FSP (M-FSP) sample is about HV 40 higher than that of the base metal. And the tensile strength of the M-FSP specimens is also significantly increased to about 1.4 times that of the base metal. Besides, the weak region of the processed zone is mainly dependent on the moving distance, where it is the previous pass stir zone in the traditional way and the transitional zone in the novel way. Increasing the rotational speed narrows the weak region in the novel way, while it does not in the traditional way.
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