作　　者： ; ; ; ; ; (张钊）;

机构地区： 江苏大学材料科学与工程学院

出　　处： 《江苏大学学报（自然科学版）》 2011年第4期456-459,共4页

摘　　要： 采用熔体反应法,以Al-K2TiF6为反应体系,原位合成Al3Ti/7055复合材料.采用X射线衍射仪、扫描电镜等试验手段,研究了合金元素Mg、稀土钇(质量分数为0.25%)及复合稀土(0.1%Y+0.15%Ce)对Al3Ti/7055复合材料微观组织的影响.结果表明:合金元素Mg对Al3Ti增强相的形貌、尺寸有重要的影响,Al3Ti/7055复合材料的最佳制备工艺为先复合再加Mg;添加单一稀土钇可抑制Al3Ti增强相凝固过程中析出部分的长大,增强相大小均匀,形貌趋向一致,以短棒状为主;添加复合稀土可抑制Al3Ti增强相径向尺寸的长大,主要为细棒状. In-situ Al3Ti/7055 composites were synthesized by direct melt reaction method in Al-K2TiF6 system.The preparation technics was discussed and the effects of Mg,Y（0.25%） and multiple rare earth（0.1%Y＋0.15%Ce） addition on microstructures of Al3Ti/7055 composites were investigated by X-ray diffraction and scanning electron microscope.The results show that the morphology and size of Al3Ti reinforcement are influenced significantly by Mg,and the optimal preparation process is composition with latter Mg alloying.The Al3Ti precipitation during solidification process are restrained by 0.25%Y addition,and lead in the uniform of Al3Ti size and morphology.The morphology of Al3Ti mainly is shot-rod like.The radial growth of Al3Ti is strongly restrained by rare earth composite addition,and the main morphology is slender-rod like.

关 键 词： 复合材料 原位合成 稀土元素 增强相 微观组织

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]