Resistance of nanocrystalline vis-à-vis microcrystalline Fe–Cr alloys to environmental degradation and challenges to their synthesis
Data(s) |
01/01/2010
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Resumo |
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. |
Identificador | |
Idioma(s) |
eng |
Publicador |
Taylor & Francis |
Relação |
http://dro.deakin.edu.au/eserv/DU:30054741/gutpa-resistanceof-2010.pdf http://dx.doi.org/10.1080/14786435.2010.484402 |
Direitos |
2010, Taylor & Francis |
Palavras-Chave | #nanocrystalline Fe–Cr alloys #ball-milling #grain growth #oxide film #secondary ion mass spectrometry (SIMS) #oxidation resistance |
Tipo |
Journal Article |