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Resistance of nanocrystalline vis-à-vis microcrystalline Fe–Cr alloys to environmental degradation and challenges to their synthesis

Raman, R.K. Singh, Gupta, Rajeev K. and Koch, Carl C. 2010, Resistance of nanocrystalline vis-à-vis microcrystalline Fe–Cr alloys to environmental degradation and challenges to their synthesis, Philosophical magazine, vol. 90, no. 23, pp. 3233-3260, doi: 10.1080/14786435.2010.484402.

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Title Resistance of nanocrystalline vis-à-vis microcrystalline Fe–Cr alloys to environmental degradation and challenges to their synthesis
Author(s) Raman, R.K. Singh
Gupta, Rajeev K.
Koch, Carl C.
Journal name Philosophical magazine
Volume number 90
Issue number 23
Start page 3233
End page 3260
Total pages 28
Publisher Taylor & Francis
Place of publication London, England
Publication date 2010
ISSN 1478-6443
1478-6435
Keyword(s) nanocrystalline Fe–Cr alloys
ball-milling
grain growth
oxide film
secondary ion mass spectrometry (SIMS)
oxidation resistance
Summary This paper presents a hypothesis and its experimental validation that a nanostructure can bring about dramatic improvements in the oxidation/corrosion resistance of iron–chromium alloys. More specifically, a nanocrystalline Fe–10 wt% Cr alloy was found to undergo oxidation at a rate that was an order of magnitude lower than its microcrystalline counterpart. Importantly, the oxidation resistance of nanocrystalline Fe–10 wt% Cr alloy was comparable with that of the common corrosion-resistant microcrystalline stainless steels (having 18–20 wt% chromium). The findings have the potential of leading to the next generation of oxidation-resistant alloys. However, due to poor thermal stability of nanocrystalline structure, synthesis/processing of such alloys is a challenge. Discs of nanocrystalline Fe–10% Cr alloy were produced by ball-milling of Fe and Cr powders and compaction of the powder without considerable grain growth by processing within a suitable time–temperature window. The paper also presents a theoretical treatise to arrive at the minimum chromium content required for establishing a protective layer of chromium oxide in an Fe–Cr alloy of a given nanometric grain size.
Language eng
DOI 10.1080/14786435.2010.484402
Field of Research 091207 Metals and Alloy Materials
091299 Materials Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, Taylor & Francis
Persistent URL http://hdl.handle.net/10536/DRO/DU:30054741

Document type: Journal Article
Collection: Institute for Frontier Materials
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