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The Influence of the Alloy Microstructure on the Oxidation Behavior of Ti–46Al–1Cr–0.2Si Alloy

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Abstract

The influence of microstructure of the two-phase alloyTi–46Al–1Cr–0.2Si on the oxidation behavior in air between600 and 900°C was studied. The oxidation rate, type of scale, and scalespallation resistance were strongly affected by the type of microstructure,i.e., lamellar in as-cast material and duplex after extrusion at1300°C. The oxidation rate was affected by the size and distribution ofthe α2-Ti3Al phase, being faster for the extrudedmaterial with coarse α2-Ti3Al. The type of oxide scaledetermines the spalling resistance. Cast material developed a uniform scalethat spalled off after short exposure times at 800 and 900°C when a criticalthickness was reached. The extruded material presented a heterogeneous scalewith predominant thick regions formed on γ-TiAl-α2-Ti3Algrains and thin scale regions formed on γ-TiAl grains. Thistype of scale could permit an easier relaxation in the matrix of stressesgenerated by both thermal-expansion mismatch between scale and alloy andoxide growth, resulting in a higher spallation resistance.

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Authors and Affiliations

  1. Centro Nacional de Investigaciones Metalúgicas, CENIM (CSIC), Avda. Gregorio del Amo 8, 28040, Madrid, Spain

    P. Pérez, J. A. Jiménez & P. Adeva

  2. Max-Planck Institut für Eisenforschung GmbH, Max Planck Straße 1, D-40237, Düsseldorf, Germany

    G. Frommeyer

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  1. P. Pérez
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  2. J. A. Jiménez
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  3. G. Frommeyer
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  4. P. Adeva
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Pérez, P., Jiménez, J.A., Frommeyer, G. et al. The Influence of the Alloy Microstructure on the Oxidation Behavior of Ti–46Al–1Cr–0.2Si Alloy. Oxidation of Metals 53, 99–124 (2000). https://doi.org/10.1023/A:1004534830767

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