Microstructure evolution and mechanical characterization of dissimilar material (AL6063-T4 and MG AZ31B) in friction stir welding
摘要
In the present investigation, 3 mm thick plates of two different alloys, namely AL6063-T4 Al alloy and MG AZ31B Mg alloy, were utilized to join by friction stir welding (FSW), And fabricated joints were investigated to find the impact of inputs on mechanical properties and study the microstructure properties of the joints. A comprehensive heat model is prepared for the FSW process with consideration of the shape of the tool, value of rotational speed and travel speed to expect and control the temperature distribution in the zone of action. The responses are considered as vickers hardness and tensile property and grain structure. At tool rotation above 900 rpm, the tool for the experimentation has fabricated to formed inter-infiltraration structure through mechanical interlocking in the welding zone. An orthogonal Taguchi L9 plan of tests is established to optimize the results, with turning And transverse speeds selected as the main variables. Experimental observation showed that a tool rotation speed of 1120 rpm created a maximum amount of frictional heat, which softened the parent metals. This frictional heat facilitated evenly distributed grain transformation into dynamic recrystallized And smooth refined structure throughout the welding zone. The result concluded that the combined revolution speed of 1120 rpm And a travel speed of 63 mm/min provide yield tensile quality of 80.76 MPa And a extreme hardness of 91 Hv.