Abstract
Nanocrystalline Ni 3Al was fabricated through mechanical alloying of elemental powders and spark plasma sintering. The nanocrystalline Ni 3Al has a nearly full density after being sintered at 1223 K for 10 min under a pressure of 65 MPa. Isothermal and cyclic oxidations of nanocrystalline Ni 3Al were tested at 1173–1373 K with intervals of 100 K. The results indicate that nanocrystalline Ni 3Al exhibits excellent isothermal and cyclical oxidation resistance. The oxide scales consist primarily of dense and continuous α-Al 2O 3. The grain refinement is beneficial for improving the oxidation resistance of Ni 3Al by providing more nucleation centers for the Al 2O 3 formation, promoting the selective formation of Al 2O 3 and improving the adhesion of oxide scales to the matrix.
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