Paper Title:
Synthesis of Al2O3 Reinforced TiAl Composites from Ti-Al-Nb2O5
  Abstract

TiAl/Al2O3 in situ composites have been prepared by a reactive hot pressing method from Ti, Al and Nb2O5 powders. The phase transformation and the mechanism of synthesis were studied by differential scanning calorimeter (DSC) of starting powers and X-ray diffraction (XRD) of samples hot press sintered at different temperatures from 500 °C to 1300 °C. Scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS) was utilized to investigate the morphology characteristics of the products. The resultant in situ formed TiAl/Al2O3 composites exhibited multiplex structures containing TiAl, Ti3Al, Al2O3 and NbAl3 phases. Fine Al2O3 particles that act as reinforcing phase are dispersed along the interface of the matrix. The formation of TiAl/Al2O3 composite involves many transitional stages. Firstly, Ti and Al reacted to form TiAl3 and Ti3Al intermediates, then Nb2O5 was reduced by Al to form the Al2O3, and finally, the competitive solid-state diffusing reactions among Ti3Al, TiAl and TiAl3 produced the final matrix phases of the resultant composite.

  Info
Periodical
Advanced Materials Research (Volumes 239-242)
Edited by
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
Pages
3005-3008
DOI
10.4028/www.scientific.net/AMR.239-242.3005
Citation
J. F. Zhu, W. W. Yang, F. N. Du, "Synthesis of Al2O3 Reinforced TiAl Composites from Ti-Al-Nb2O5", Advanced Materials Research, Vols. 239-242, pp. 3005-3008, 2011
Online since
May 2011
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$32.00
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