Abstract
In this paper, in-situ nanoparticles ZrB2 and Al2O3 are introduced to raise the mechanical properties of AA7N01 Laser beam welding (LBW) joint by in-situ melt reaction method. The effects of ZrB2 and Al2O3 nanoparticles on the microstructure and tensile properties of in-situ (ZrB2+Al2O3)/AA7N01 nanocomposites and LBW joints were studied. The experimental results indicate that ZrB2 nanoparticles provide more nucleation sites for grain nucleation and tend to aggregate at the grain boundary (GB). The average grain size of composites is greatly refined from about 110 μm to 20 μm. As the content of particles increased from 1 vol% to 3 vol%, the ultimate tensile strength (UTS) of nanocomposites is enhanced from 439.3 MPa to 538.2 MPa, the UTS of the LBW joint is increased from 246.7 MPa to 353.6 MPa. The effects of ZrB2 and Al2O3 nanoparticles on grain refinement and growth of matrix are analyzed. Furthermore, the strengthen mechanism induced by the precipitates and nanoparticles on the mechanical properties of composites and joints are also discussed.
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