Microstructure and oxidation resistance of Cr-Ta-Si alloys
Bhowmik A, Pang HT, Neumeier S, Stone HJ, Edmonds I (2011)
Publication Type: Conference contribution
Publication year: 2011
Journal
Book Volume: 1295
Pages Range: 323-328
Conference Proceedings Title: Materials Research Society Symposium Proceedings
Event location: USA
ISBN: 9781605112725
DOI: 10.1557/opl.2011.38
Abstract
The phase equilibria and oxidation resistance of alloys lying near the Cr-rich end of the Cr-Ta-Si system have been investigated. Samples were prepared by arc-melting and homogenized at 1300°C for 500hrs. Identification of the phases present and their compositions were carried out using x-ray diffraction and electron probe micro-analysis and the ternary phase diagram on the Cr-rich end was plotted. A three-phase equilibria was found to exist between an A2 Cr-solid solution, a hexagonal Laves phase and the A15 Cr3Si intermetallic phase for alloys with higher contents of Si. Thermo-gravimetric analysis of the alloys at 1100°C demonstrated an improvement in the oxidation resistance of the ternary alloys with increasing Si-content. The microstructures of the oxidized samples revealed the formation of a thick chromia layer on top of a Cr,Ta-mixed oxide layer and an internal oxidation zone for all the alloys. A protective silica layer was not observed to form in any of the alloys tested. © 2011 Materials Research Society.
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APA:
Bhowmik, A., Pang, H.T., Neumeier, S., Stone, H.J., & Edmonds, I. (2011). Microstructure and oxidation resistance of Cr-Ta-Si alloys. In Materials Research Society Symposium Proceedings (pp. 323-328). USA.
MLA:
Bhowmik, Ayan, et al. "Microstructure and oxidation resistance of Cr-Ta-Si alloys." Proceedings of the 2010 MRS Fall Meeting, USA 2011. 323-328.
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