中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 16 Special 3 December 2006 |
（1.陕西省西安市西安理工大学材料科学与工程学院
2.陕西省咸阳市陕西科技大学材料科学与工程学院
3.School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
4.School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xianyang 712081, China）
Abstract:Al2O3(f)/TiAl composites were synthesized by an exothermic reaction method using Ti, Al and TiO2 powders doped with Nb2O5 and La2O3. The effect of Nb2O5 and La2O3 additives on the growth and morphology of the fibers, the phases and microstructure of the composites were investigated by means of XRD and SEM. The result indicates that the in situ alumina fiber can be developed in Ti-Al matrix with the Ti/Al mole ratio of 1:2-1:7, and the addition of rare earth powders can improve the dispersion of the fibers in the matrix and increase the length-to-diameter ratio of the fibers.
Key words: rare earth; additives; alumina fiber; intermetallic composite; microstructure
