搅拌摩擦沉积固相增材制造6061铝合金组织与性能研究OA

To explore the effects of build direction on microstructure and mechanical properties of 6061 aluminum alloy during solid-state additive friction stir deposition(AFSD),6061-T6 aluminum alloy rods were adopted as raw materials,and deposited samples were fabricated by the AFSD process.Samples were extracted along the parallel deposition direction(xoy forming surface)and vertical deposition direction(yoz forming surface),respectively.Scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and electron backscatter diffraction(EBSD)were used to analyze the types and distribution characteristics of precipitated phases under different build orientations,as well as the differences in microstructure and mechanical properties.The results reveal that under optimized process parameters,6061 aluminum alloy samples fabricated by AFSD possess favorable forming performance and excellent densification.There is no obvious difference in microstructure between xoy and yoz forming surfaces.The dominant grain sizes range from 3 μm to 6 μm,and both grain boundary morphology and crystallographic orientations present random distribution.The mechanical strength exhibits obvious isotropic behavior,and the difference in elongation originates from the statistical distribution of microdefects,rather than texture-induced directional anisotropy.The results provide reliable data support for further understanding the mechanical behavior of aluminum alloys fabricated by AFSD solid-state additive manufacturing,and supply valuable guidance for improving the forming quality of this process.