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采用K_2TiF_6无机盐和SiC陶瓷颗粒与铝熔体原位反应制备不同含量TiC颗粒(0,2.5%,5%,质量分数)增强AA6061铝合金。为分解SiC释放碳原子,合金在高温下进行铸造,并保温一段时间。X射线衍射分析表明铝基复合材料中只生成TiC颗粒而未见其他金属间化合物。采用场发射扫描电子显微镜(FESEM)和背散射电子衍射(EBSD)分析AA6061/TiC复合材料的显微组织。结果表明原位生成的TiC颗粒分布均匀,界面清晰,结合良好,并具有立方、球形和六方等形状。EBSD图像表明TiC颗粒对复合材料具有明显的晶粒细化效果。TiC颗粒可提高铝基复合材料的显微硬度和抗拉强度。
In situ preparation of AA6061 aluminum alloy with different content of TiC particles (0,2.5%, 5%, mass fraction) by K_2TiF_6 inorganic salt and SiC ceramic particles in situ reaction with aluminum melt. To decompose SiC to release carbon atoms, the alloy is cast at a high temperature and held for a period of time. X-ray diffraction analysis showed that only TiC particles were formed in the aluminum matrix composites without other intermetallic compounds. The microstructure of AA6061 / TiC composites was analyzed by field emission scanning electron microscopy (FESEM) and backscattered electron diffraction (EBSD). The results show that in-situ TiC particles are uniformly distributed, the interface is clear and well bonded, and the shapes are cubic, spherical and hexagonal. EBSD images show that TiC particles have a significant grain refinement effect on the composites. TiC particles can improve the microhardness and tensile strength of aluminum matrix composites.