Microstructure and Mechanical Properties of B/GZ151K Mg Matrix Composites Fabricated by Laser Powder Bed Fusion
The B/GZ151K Magnesium Matrix Composites(MMCs)were prepared using powder three-dimensional mixing and Laser Powder Bed Fusion(LPBF)technology.And GZ151K(Mg-15Gd-1Zn-0.4Zr,％)is currently one of the highest strength magnesium casting alloys.The B/GZ151K MMCs typically consisted of the B particles and the GZ151K Mg matrix.The matrix comprised fine α-Mg grains(average grain size less than 5 μm)and point-like and strip-like Mg3Gd phases.The yield strength(YS),ultimate tensile strength(UTS)and elongation of the LPBFed B/GZ151K MMCs were 325 MPa,348 MPa and 1.7％,respectively,with an elastic modulus of 52.5 GPa.Compared with as-cast GZ151K Mg alloy,the YS and UTS of the LPBFed B/GZ151K composition were obviously higher,while the elongation was greatly reduced.The elastic modulus of the LPBFed B/GZ151K composition was 16.7％higher than that of the as-cast GZ151K alloy(45 GPa).This study indicates that three-dimensional mixing of different powders combined with LPBF can fabricate MMCs,but achieving a uniform distribution of nanoscale reinforcing particles within the matrix remains a challenge at this stage.
magnesium matrix compositespowder mixingadditive manufacturinglaser powder bed fusionelastic modulus
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