Fasediagram

Al-Mg binary phase diagram The equilibrium diagram indicates five different phases-two terminal solid solutions i.e. Al(Mg) and Mg(Al), and three intermetallic compounds, Al 3 Mg 2 , R and Al 12 Mg 17. If we weld pure Al and Mg together and if an equal proportion of both the materials (weight%) are present in the weld nugget, this will lead to the formation of Al 3 Mg 2 and Al 12 Mg 17 phases at room temperature. But in reality, during friction stir welding of dissimilar metal, the material flow is quite complex and a non-equilibrium condition exists during processing. Thus, the presence of intermetallics compounds results poor weld quality. To overcome these difficulties, one needs to choose the appropriate welding parameters such as positioning of the materials, tool rotation rate, tool traverse speed and position of the tool from weld interface. In this section, we will discuss about Friction Stir Welding of AZ31B Magnesium Alloys and AA5052 Aluminium alloys [7]. The materials used for butt joints were extruded AZ31B magnesium alloy and A5052-H aluminum alloy plate. The plate thickness was nominally 3 [mm]. These materials were put on the table of highpowered FSW machine that the tool advancing side was Al plate and retreating side was Mg plate. The rotational tool was inserted 

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