Microstructural evolution in niobium-based alloys

Tewari, R. ; Song, H. ; Dey, G. K. ; Chatterjee, A. ; Vasudevan, V. K. (2008) Microstructural evolution in niobium-based alloys Metallurgical and Materials Transactions A, 39 (7). pp. 1506-1518. ISSN 1073-5623

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Official URL: http://www.springerlink.com/content/h0402h651r711u...

Related URL: http://dx.doi.org/10.1007/s11661-008-9526-1


Nb-Ti-Cr-Si-Al-X alloys have been considered as candidate materials for high-temperature structural applications in aero engines. Using a multicomponent approach, attempts are being made to obtain good strength with adequate oxidation resistance at the expected operating temperatures (~1073 through 1273 K) in these alloys. In the microstructure of these alloys, which essentially consist of the silicide phase distributed in the bcc β matrix, the presence or absence of the Laves phase can bring about considerable changes in the mechanical properties. The present article reports on the instability observed in the β phase and also on the formation of the Laves phase in the β matrix. The extent of the chemical separation and elements responsible for this separation has been determined. Different morphologies of the Laves phase have been obtained by aging at different temperatures for various durations and the structure, chemistry, and volume fraction of these phases have been determined.

Item Type:Article
Source:Copyright of this article belongs to The Minerals, Metals & Materials Society.
ID Code:82301
Deposited On:10 Feb 2012 04:50
Last Modified:10 Feb 2012 04:50

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