Effects of Cr and Al on High Temperature Oxidation Resistance of Nb-Si System Intermetallics


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The effects of Cr and Al on high temperature oxidation resistance of Nb-Si system intermetallics have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and weight gain method. The results showed that the high temperature oxidation resistance can be substantially improved by proper Cr or Al addition. The further analysis revealed that Cr promotes the formation of CrNbO4 in scale and improve the adherence between the oxide scale and the substrate. It also found that Al improves the surface morphology of oxide scale and changes oxidation products by promoting the AlNbO4 formation.



Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.




S. Y. Qu et al., "Effects of Cr and Al on High Temperature Oxidation Resistance of Nb-Si System Intermetallics", Materials Science Forum, Vols. 546-549, pp. 1485-1488, 2007

Online since:

May 2007




[1] B.P. Bewlay et al, Investigation of High-Temperature Eutectic-based Microcomposites, Annual Reportes (March 1994 and 1995), GE Corporate Research and Development, Schenectady, NY, AFOSR contract F49620-93-C-0007.

[2] M.R. Jackson, R.G. Rowe and D.W. Skelly, Alloy Development of In-Situ Intermetallic Composites, GE Co Report 94CRD050, Annual Report #1 (September 20, 1993), WRDC contract F33615-91-C-5977.

[3] D.M. Dimiduk, M.G. Mendiratta and P.R. Subramanian, Structural Intermetallics, ed. R. Darolia et al. (warrendale, PA, TMS, 1993), p.501.

[4] M.G. Mendiratta and D.M. Dimiduk, Metall. Trans. A, 24A (1993), p.619.

[5] Won-Yong Kim, Hisao Tanaka and Sguji Hanadda, Intermetallics, 10 (2002), p.625.

[6] T.B. Massalski, Binary Alloy Phase Diagrams, Metals Park (OH), ASM, 1991, p.2767.

[7] P.R. Subramanian, M.G. Mendiratta, D.M. Dimiduk and M.A. Stucke, Materials Science and Engingeering, A239-240, (1997), p.1.

[8] M.G. Mendiratta, J.J. Lewandowski and D.M. Dimiduk, Metall. Trans, 22A, (1991), p.1573.

[9] E.S.K. Menon, M.G. Mendiratta and D.M. Dimiduk, Structural Intermetallics 2001, Edited by K.J. Hemker, D.M. Dimid&, H. Clemens, R. Darolia, H. Inui, J.M. Larsen, V.K. Sikka and J.D. Whittenberger, TMS (The Minerals, Metals & Materials Society), (2001).