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采用原位合成法制备TiC/Al(7075)复合材料,研究原位TiC颗粒的存在形式、分布状态及不同原位TiC颗粒含量对TiC/Al(7075)复合材料的微观组织及力学性能的影响。结果显示,TiC颗粒多以近球形团聚态存在于7075铝基体中,颗粒团大小约为1μm。当原位TiC颗粒质量分数小于6%时,原位TiC颗粒分布较为均匀,随着颗粒含量的增加,TiC/Al(7075)复合材料的铸态组织由蔷薇状组织逐渐转变为等轴晶组织,晶粒尺寸也随着原位TiC颗粒含量的增加而减小。当原位TiC颗粒的质量分数大于6%时,组织中出现气孔。复合材料的硬度和抗冲击韧性测试表明,TiC/Al(7075)复合材料的硬度随TiC颗粒含量的增加而增加,最高硬度达HB 108,冲击韧性在颗粒质量分数为6%时达到最佳,较基体提升31.55%。
The in-situ synthesis of TiC / Al (7075) composites was used to study the effect of in-situ TiC particles on the microstructure and mechanical properties of TiC / Al (7075) composites . The results show that the TiC particles mostly exist in the 7075 aluminum matrix with nearly spherical agglomeration, and the size of the particles is about 1μm. When the mass fraction of in-situ TiC particles is less than 6%, the in-situ TiC particles distribute more evenly. With the increase of the particle content, the as-cast TiC / Al (7075) composites gradually change from rosette to equiaxed , The grain size also decreases with the increase of the content of TiC particles in situ. When the mass fraction of in situ TiC particles is greater than 6%, pores appear in the tissue. The hardness and impact toughness of the composites show that the hardness of TiC / Al (7075) composites increases with the increase of TiC content, the highest hardness reaches HB 108, the impact toughness reaches the best when the mass fraction of particles is 6% Up 31.55% over the base.