Microstructure and Mechanical Properties of Al₂O₃/TiAl In Situ Composites Doped with Fe₂O₃

Abstract:

Al2O3/TiAl in situ composites were successfully prepared by vacuum hot-pressing method with elemental powder mixtures of Ti, Al, TiO2 and Fe2O3. The effect of Fe2O3 addition on the microstructures and mechanical properties of Al2O3/TiAl composites has been investigated. The results show that the Rockwell hardness, flexural strength and fracture toughness of the composites increase with increasing Fe2O3 content. When the Fe2O3 content is 0.84 wt %, the flexural strength and the fracture toughness reach the maximum value of 624 MPa and 6.63 MPa·m1/2, respectively. The improvement of mechanical properties is firstly associated with a more homogeneous and finer microstructure developed by addition of Fe2O3; secondly, it is related to the increase of the ratio of α2-Ti3Al/γ- TiAl matrix phases.

• Periodical: Materials Science Forum (Volumes 675-677)
• Pages: 597-600
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.675-677.597
• Online since: February 2011
• Authors: Liu Yi Xiang, Fen Wang, Jian Feng Zhu, Xiao Feng Wang
• Keywords: Al₂O₃/Tial Composite, Hot-Pressing, Microstructure

References

[1] F. Appel, U. Christoph and M. Oehring: Mat. Sci. Eng. A Vol. 329–331 (2002), p.780.

[2] X.H. Wu: Intermetallics Vol. 14 (2006), p.1114.

[3] G. Sauthoff: Intermetallics Vol. 8 (2000), p.1101.

[4] A. Lasalmonie: Intermetallics Vol. 14 (2006), p.1123.

[5] D.E. Alman: Intermetallics Vol. 13 (2005), p.572.

[6] C.L. Yeh, S.H. Su: J Alloy Compd Vol. 407 (2006), p, 150.

[7] D. Horvitz, I. Gotman, E.Y. Gutmanas and N. Claussen: J Eur Ceram Soc Vol. 22(2002), p.947.

[8] F. Wang, Z.K. Fan and J.F. Zhu: Acta Metall Sin Vol. 19 (2006), p.432.

[9] T.T. Ai: Chinese Journal of Aeronautics Vol. 21 (2008), p.559.

[10] A.F. Whitehouse, T.W. Clyne: Composites Vol. 24(1993), p.256.