碳化硅与氟钛酸钾原位反应制备AA6061/TiC铝基复合材料的显微组织与力学性能表征（英文）

Microstructure and mechanical properties characterization of AA6061/TiC aluminum matrix composites synthesized by in situ reaction of silicon carbide and potassium fluotitanate

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。

Aluminum alloys AA6061 reinforced with various amounts （0, 2.5% and 5%, mass fraction） of TiC particles were synthesized by the in situ reaction of inorganic salt K2TiF6 and ceramic particle SiC with molten aluminum. The casting was carried out at an elevated temperature and held for a longer duration to decompose SiC to release carbon atoms. X-ray diffraction patterns of the prepared AMCs clearly revealed the formation of TiC particles without the occurrence of any other intermetallic compounds. The microstructure of the prepared AA6061/TiC AMCs was studied using field emission scanning electron microscope （FESEM） and electron backscatter diffraction （EBSD）. The in situ formed TiC particles were characterized with homogeneous distribution, clear interface, good bonding and various shapes such as cubic, spherical and hexagonal. EBSD maps showed the grain refinement action of TiC particles on the produced composites. The formation of TiC particles boosted the microhardness and ultimate tensile strength （UTS） of the AMCs.