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采用接触反应法制备了原位TiC/Al-4.5Cu复合材料,借助光学显微镜、透射电子显微镜研究了向基体合金中添加不同含量的Mg对复合材料微观组织和拉伸性能的影响。结果表明:随着Mg的添加量由0.8%(质量分数,下同)增加到2.0%,TiC/Al-4.5Cu复合材料的延伸率下降,而抗拉强度在1.5%Mg时,达到极值。与同等条件下制备的不含Mg的TiC/Al-4.5Cu复合材料相比,抗拉强度提高了17.7%,但延伸率下降了17.9%。TiC颗粒的细化有助于复合材料力学性能的提高,但针状Al2CuMg相的析出阻碍了复合材料塑性的进一步提高。TiC/Al-4.5Cu-Mg复合材料中TiC颗粒尺寸为100nm左右。
In-situ TiC / Al-4.5Cu composites were prepared by the contact reaction method. The effects of adding different amounts of Mg on the microstructure and tensile properties of the composites were investigated by optical microscope and transmission electron microscope. The results show that the elongation of TiC / Al-4.5Cu composite decreases with the increase of Mg content from 0.8% (mass fraction) to 2.0%, while the tensile strength reaches 1.5% Mg . Compared with the Mg-free TiC / Al-4.5Cu composites prepared under the same conditions, the tensile strength increased by 17.7%, but the elongation decreased by 17.9%. The refinement of TiC particles contributes to the improvement of the mechanical properties of composites, but the precipitation of acicular Al2CuMg phase hinders the further increase of plasticity of composites. TiC / Al-4.5Cu-Mg composite TiC particle size of about 100nm.