Effects of Yttrium on Cyclic Oxidation Resistance of Co-10Cr-5Al Alloy

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Abstract:

The cyclic oxidation behavior of Co-10Cr-5Al alloys with and without Y in atmosphere at 800 °C was investigated. The addition of 0.3 at.% Y increased the oxidation rate of the alloy and changed the behavior from irregular oxidation kinetics to approximate parabolic rate law. The scales grown the alloys with and without Y were both composed of an outer Co2O3 layer and an inner complex layer of Al2O3, Co2O3 and Cr2O3, except that the addition of Y impaired the adhesion of the scale. Over-doped Y agglomerated in local zone plays an adverse role in the oxidation process by accelerating the oxidation rate.

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Advanced Materials Research (Volumes 785-786)

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844-847

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September 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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