Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 21, Issue -, Pages S362-S368Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(11)61607-5
Keywords
NiAl; oxidation resistance; rare earth Y
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Funding
- Foundation of the Outstanding Youth of Heilongjiang Province, China [JC200606]
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In-situ NiAl-Al2O3 and Y-doped NiAl-Al2O3 were fabricated by mechanical alloying (MA) and pulse current auxiliary sintering (PCAS). The isothermal and cyclic oxidations were carried out at 1 000 degrees C in order to investigate the influence of Y on the oxidation behaviors of NiAl-Al2O3. The results indicate that the addition of Y does not change the oxidation product of NiAl-Al2O3 and the alpha-Al2O3 scale is detected on the surface of NiAl-Al2O3 and NiAl-Al2O3-Y after isothermal oxidation. The addition of Y changes the morphologies of the scale during isothermal oxidation and leads to the disappearance of the ridge structures. Meanwhile, the mass gain of NiAl-Al2O3-Y is much lower than that of NiAl-Al2O3. During cyclic oxidation, the cracking and spallation, which were observed in the scale of NiAl-Al2O3, are eliminated with the addition of Y because the theta-alpha transformation of Al2O3 is retarded and the formation of voids and cracking are reduced.
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