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In this paper, the pressure infiltration three kinds Grf / Al composites were prepared to study the matrix alloy composition Grf / Al composite microstructure, mechanical properties and corrosion, preliminary study of alloying elements affect the interfacial bonding and material properties mechanism. The impact of alloying elements on the microstructure and properties of the matrix alloy. Al-Mg matrix alloy with the increase in the Mg content, the solid solution strengthening effect enhance the alloy strength, but the corrosion decreased. Ti, Sc-Zr and Sc-Zr-Ti composite micro-alloying can significantly refine the matrix alloy grain, increase the strength of the alloy, greatly reducing the corrosion susceptibility of the alloy. And, Sc-Zr-Ti Microalloyed than Sc-Zr, Ti microalloying improved mechanical properties and corrosion resistance of the alloy stronger. The influence of alloying elements on the microstructure of the composite. The three kinds composite tissue in M40/LG5, M40/Al-10Mg-Ti, M40/Al-10Mg-Sc-Zr-Ti dense fiber and aluminum body good combination. TEM analysis shows that, compared with the composite material of M40/LG5, Mg, Ti, as well as of Mg, Sc, Zr, Ti, elements added to the matrix is ??suppressed a grf / Al composite material in the interfacial reaction, to reduce the Al4C3 content. The influence of alloying elements on the mechanical properties of the composites. Adding Mg compared with M40/LG5 composite materials, the matrix of Ti, and Mg, Sc, Zr, Ti, elements greatly improved composite material hardness and bending strength, and the role of the latter is more obvious, but M40/Al- bulk in the the defects and M40/Al-10Mg-Sc-Zr-Ti 10Mg-Ti CuAl2 to meet reduce its mechanical properties. The bending fracture analysis showed that the binding of Mg, Ti, and Mg, Sc, Zr, Ti by changing the interface, the bending fracture the formation fracture by fiber pull out, gradually transformed into uneven pull out of the fracture of the fibers tufted change The fracture mode of the composites, thus improving the mechanical properties of the composites. The effects of alloying elements on the composite corrosive. Polarization curves, full immersion corrosion testing and corrosion morphology analysis showed that, compared and M40/LG5 composites, Mg, Ti, and Mg, Sc, Zr, Ti element reduces corrosion Grf / Al composite, and Mg, Ti corrosion reduction is more significant. Grf / Al composites with Mg, Ti compared Mg, Sc, Zr, Ti add further enhance the mechanical properties and corrosion resistance of the composite material, the better the overall performance of the composite. Mg, Sc, Zr, Ti composite micro-alloying of the matrix alloy performance improved significantly Grf / Al composite role equally significant and worthy of further study.
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