Journal
CORROSION SCIENCE
Volume 98, Issue -, Pages 699-707Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.06.016
Keywords
Intermetallics; Rare earth elements; Thermal cycling; Interfaces; Oxidation; Segregation
Funding
- National Basic Research Program (973 Program) of China [2012CB625100]
- 863 project [2012AA03A512]
- Nature Science Foundations of China (NFSC) [51231001, 51201005]
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To understand the role of reactive elements in affecting high-temperature oxidation behavior of two-phase (gamma' + beta) Ni-Al alloys, Dy and Hf modified Ni-30Al alloys were designed. The results of oxidation tests conducted at 1100 degrees C indicated that Dy effectively reduced the oxide scale growth rate and enhanced the scale adhesion, but Hf had no significant effect, especially on scale adhesion, which is very different from that in single phase beta-NiAl. Possible mechanisms were discussed by combining the solid solubility of Dy and Hf in NiAl and Ni3Al. A principle for selection of reactive element used for single doping was proposed. (C) 2015 Elsevier Ltd. All rights reserved.
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