Microstructure and Properties of TiC/AlMgSc Composites by Selective Laser Melting
TiC/AlMgSc aluminum matrix composites were fabricated by selective laser melting.The phase composition,microstructure,recrystallization distribution and mechanical properties of the aluminum matrix composites were analyzed by X-ray diffraction,scanning electron microscope and universal testing tensile machine.The increase in strength of the alloy contributed by dislocation density and TiC strengthened phase was calculated theoretically.The results show that the dislocation density of TiC/AlMgSc composites increases by 105％to 0.72× 1014 m-2 with the addition of TiC reinforced particles,the proportion of＜1 μm grains and sub-grain boundaries increases significantly,and the degree of recrystallization decreases.The tensile strength,yield strength and elongation reach 611 MPa,589 MPa and 11.0％,respectively.Compared with those of AlMgSc alloy,the yield strength of the composites increases by 70 MPa while the elongation decreases by 1.1％.
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