期刊
CORROSION SCIENCE
卷 75, 期 -, 页码 337-344出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.06.017
关键词
Intermetallics; SEM; Hydrogen permeation; Oxidation; Segregation
资金
- National Nature Science Foundations of China (NSFC) [51071013, 51201005]
- National Basic Research Program (973 Program) of China [2010CB631200, 2012CB625100]
Oxidation behavior of NiAl and 0.05 at.% Hf doped NiAl alloys were investigated at 1100 degrees C in dry and humid atmospheres. Hf doping significantly improved the cyclic oxidation resistance. Water vapour promoted the formation of voids at the scale/alloy interface and accelerated scale spallation. Also, water vapour had effect on the phase transformation from theta- to alpha-Al2O3 at the initial oxidation stage. In humid atmosphere, more Hf segregated at the scale/alloy interface to form oxide pegs. Pre-oxidation process in O-2 + Ar could compromise the effect of humid atmosphere on the oxidation kinetics of the NiAl alloys. (C) 2013 Elsevier Ltd. All rights reserved.
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