Local Melting and Cracking during Friction Stir Spot Welding on Mg-Al binary Alloy
Local melting and cracking are investigated during friction stir spot welding of binary Mg-Al alloys containing from 3% to 23% Al by using a combination of stir zone temperature, rotational torque and detailed metallographic. The stir zone temperatures during Mg-15%Al and Mg-23%Al alloys friction stir spot welding correspond with the (α-Mg + Mg<sub>17</sub>Al<sub>12</sub>) eutectic temperature in the binary Mg-Al equilibrium phase diagram. The stir zone microstructures of friction stir spot welds in Mg-15%Al and Mg-23%Al alloys comprise fine equiaxed α phases and Mg<sub>17</sub>Al<sub>12</sub>. Narrow stir zones and lower rotational torques are observed when Mg-15%Al and Mg-23%Al alloys are spot welded since energy generation is diminished by tool slippage due to existing eutectic liquid at contact interface. These results support that local melting of the (α-Mg + Mg<sub>17</sub>Al<sub>12</sub>) eutectic microstructure occurred at the contact interface between the tool surface and material when the stir zone temperature attained to the eutectic temperature in the binary Mg-Al equilibrium phase diagram.<br>Liquation cracking is observed in the location beneath the tool shoulder in friction stir spot welds of Mg-9%Al alloy. The crack surface morphology is formed of dendrite shape. It is confirmed that the cracking occurred during Mg-9%Al alloy friction stir spot welding is liquation cracking.
- 溶接学会論文集 : quarterly journal of the Japan Welding Society
溶接学会論文集 : quarterly journal of the Japan Welding Society 27(2), 94s-98s, 2010-01-20