The oxidation of four Ni-xSi-6Al alloys (x = 0, 2,4 and 6 at.%) has been studied at 1273 K under 0.1 MPa O-2. Silicon exerts the third-element effect by reducing the critical Al content needed for the transition from its internal to its external oxidation with respect to Ni-Al alloys. This result is interpreted by extending to ternary alloys Wagner's criterion for the same transition in binary alloys. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china.;niu, y (reprint author), chinese acad sci, state key lab corros & protect, inst met res, wencui rd 62, shenyang 110016, peoples r china;ywu@imr.ac.cn yniu@imr.ac.cn
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