中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 7 July 2012 |
（1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
3. Joining and Welding Research Institute, Osaka University, Ibaraki, Osaka 567-0047, Japan）
Abstract:(TiB2+TiC)/Ni3Al composites were prepared by mechanical alloying of elemental powders and subsequently spark plasma sintering. Microstructure of (TiB2+TiC)/Ni3Al composite sintered at 950 °C was finer than that of composite sintered at 1050 °C. The influence of grain size on cyclic oxidation behavior was investigated. Cyclic oxidation results showed that the composite sintered at 950 °C had smaller mass gains than the composite sintered at 1050 °C. XRD and EDS results indicate that finer grain size is beneficial for increasing the oxidation resistance by improving the formation of a continuous TiO2 outer layer and a continuous Al2O3 inner layer on the surface of the composites sintered at 950 °C.
Key words: nickel aluminides; composites; grain refinement; oxidation; mechanical alloying
