Forming process and microstructure properties of GMA additive manufacture of AZ91 magnesium alloy
In order to explore the application prospects of GMA additive manufacture technology in the forming of AZ91 magnesium alloy components,this paper studied the effect of pass offset on the morphology of GMA additive manufactured multi-layer and multi-pass magnesium alloy,and analyzed the microstructure and tensile mechanical properties of the forming samples.When the overlap distance was 11 mm,the surface of the fusion layer obtained was the smoothest,with a maximum forming deviation of 0.85 mm.The microstructure of additive samples could be divided into intra layer region,interlayer interface region and lap interface region as a whole.The grain structure of the three regions was equiaxed fine grain structure,and the grain size of the interlayer interface region and lap interface region varied according to thermal cycling variation.The mechanical properties in different tensile directions were similar,with a tensile strength of 255 MPa and an elongation after fracture of 11％in the additive direction.The tensile strength in the overlapping direction was 244 MPa,and the elongation after fracture was 10.5％.The tensile strength in the stacking direction was 240 MPa,and the elongation after fracture was 10％.
AZ91 magnesium alloyGMA additive manufactureforming processmicrostructure and property
万方数据
维普
