Effects of Y and multiple rare earth addition on microstructures of Al3Ti／7055 composites
1.School of Material Science and Engineering, Jiangsu University, Zhenjiang， Jiangsu 212013, China; 2.Silicon Lake College, Kunshan, Jiangsu 215332, China; 3.Jiangsu C＆E Material Research Institute Company Limited, Zhenjiang, Jiangsu 212013, China)
Abstract：Insitu 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 shotrod like. The radial growth of Al3Ti is strongly restrained by rare earth composite addition, and the main morphology is slenderrod like.
2011, Vol. 32 
