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采用原位反应和液态搅拌合成法制备混杂相(Al3Ti+SiCp)增强过共晶铝基复合材料,研究了(Al3Ti+SiCp)/Al-14Si复合材料的微观组织和强化机理。结果表明:采用原位反应法生成的Al3Ti具有良好的细化晶粒效果;通过液态搅拌可以使得原位生成Al3Ti增强相粒子和初晶硅更加细化;由于SiCp的存在使得Al基体畸变,产生密集的位错,对过共晶铝合金的力学性能有着重要影响。
The microstructure and strengthening mechanism of (Al3Ti + SiCp) / Al-14Si composites were studied by in-situ reaction and liquid-state mixing synthesis of Al3Ti + SiCp reinforced hypereutectic aluminum matrix composites. The results show that Al3Ti produced by in-situ reaction has a good grain refinement effect. Al3Ti-enhanced particles and primary Si can be refined by liquid-state mixing. The Al matrix is distorted due to the presence of SiCp Dense dislocations have an important influence on the mechanical properties of hypereutectic aluminum alloys.