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

Authors:Pérez Zubiaur, Pablo
Jiménez, José Antonio
Frommeyer, G.
Adeva, Paloma
Keywords:TiAl-based intermetallic alloy, Oxidation, Microstructure
Issue Date:2000
Citation:Oxidation of Metals 53(1-2) : 99-124 (2000)
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 2-Ti3Al phase, being faster for the extrudedmaterial with coarse 2-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 -TiAl-2-Ti3Algrains and thin scale regions formed on -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.
Publisher version (URL):http://dx.doi.org/10.1023/A:1004534830767
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