Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7896426 | Corrosion Science | 2013 | 8 Pages |
Abstract
Oxidation behavior of NiAl and 0.05 at.% Hf doped NiAl alloys were investigated at 1100 °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 θ- to α-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 O2 + Ar could compromise the effect of humid atmosphere on the oxidation kinetics of the NiAl alloys.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Kai Yan, Hongbo Guo, Shengkai Gong,