Abstract
The use of lightweight vehicles is a beneficial strategy for reducing emissions of greenhouse gases and fossil fuel consumption. AZ91 Mg alloy is lightweight and has engineering importance in most industries to supplant steel, iron, and different metals with bigger density. The welding feasibility of magnesium alloys might be a significant effort for lightweight goals and its applications in a variety of industries. In the current experiment, friction stir welding of AZ91 Mg alloy was carried out, microstructure and mechanical properties of the weld joint were investigated. Defect-free weld joint of AZ91 magnesium alloy was obtained by friction stir welding. The highest (78 HV) and lowest (60 HV) microhardness in the joint was observed in the stirring zone and heat-affected zone (advancing side), respectively. The impact energy during the Charpy test was about 89.2 % of base metal’s impact energy. Percentage elongation (10.37 %) and tensile strength (173 MPa) of weld joint was 74.7 % and 73.6 %, respectively that of base metal. The unique grain structure was observed in different weld zones but no influence of welding was experienced by the grains in base metal. The joint was composed of equiaxed fine grains in the stirring zone.
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