Fabrication and Mechanical Properties of Al2O3/TiAl in Situ Composites Doped With Nb2O5

Authors

  • F. Wang Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology
  • N. Fan Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology
  • J. Zhu Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology
  • H. Jiang Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology

Abstract

Al2O3/TiAl composites were successfully fabricated from powder mixtures of Ti, Al, TiO2, Cr2O3 and Nb2O5 by a hot-press-assisted exothermic dispersion method. The effect of the Cr2O3 and Nb2O5 addition on the microstructures and mechanical properties of Al2O3/TiAl composites was characterized. The results showed that the specimens are mainly composed of TiAl, Ti3Al, Al2O3, NbAl3 and Cr2Al. The Vicker-hardness and density of Al2O3/TiAl composites increase gradually with the increase of Nb2O5 content. When the Nb2O5 content was 6.54 wt %, the flexural strength and fracture toughness of the composites have a maximum values of 789.79 MPa and 9.69 MPa m1/2, respectively. The improvement of mechanical properties is discussed in detail.

Downloads

Published

2017-12-13

Issue

Vol. 47 No. 3 (2015)

Section

Articles

License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Authors retain copyright of the published papers and grant to the publisher the right to publish the article, to be cited as its original publisher in case of reuse, and to distribute it in all forms and media. Articles will be distributed under the Creative Commons Attribution International License (CC BY 4.0).