Abstract
Oscillating laser-arc hybrid welding of AZ31B magnesium alloy with different content of carbon nanotubes (CNTs) was carried out, the distribution characteristics of CNTs and its effect on microstructure and tensile properties were investigated. The results showed that the CNTs can increase the absorption rate of the Mg alloy to the laser. Compared with the weld without CNTs, the grain sizes of the welds with CNTs were refined by more than 50 % and the maximum intensities of {0001} texture were weakened by more than 60 %. The mechanical properties of welds were mainly related to the distribution characteristics of CNTs. The tensile strength and elongation rate of the weld employing 3 wt% CNTs ethanol dispersion reached the maximum value of 244 MPa and 12.5 %. Finally, the distribution and ductility improvement mechanism of CNTs were discussed basing on the viscosity of molten pool and the bonding between the CNTs with the matrix.
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