The influence of the alloy microstructure on the oxidation behavior of Ti-46Al-1Cr-0.2Si alloy
Journal Article
·
· Oxidation of Metals
The influence of microstructure of the two-phase alloy Ti-46Al-1Cr-0.2Si on the oxidation behavior in air between 600 and 900 C was studied. The oxidation rate, type of scale, and scale spallation resistance were strongly affected by the type of microstructure, i.e., lamellar in as-cast material and duplex after extrusion at 1,300 C. The oxidation rate was affected by the size and distribution of the {alpha}{sub 2}-Ti{sub 3}Al. The type of oxide scale determines the spalling resistance. Cast material developed a uniform scale that spalled off after short exposure times at 800 and 900 C when a critical thickness was reached. The extruded material presented a heterogeneous scale with predominant thick regions formed on {gamma}-TiAl-{alpha}{sub 2}-Ti{sub 3}Al grains and thin scale regions formed on {gamma}-TiAl grains. This type of scale could permit an easier relaxation in the matrix of stresses generated by both thermal-expansion mismatch between scale and alloy and oxide growth, resulting in a higher spallation resistance.
- Research Organization:
- CSIC, Centro Nacional de Investigaciones Metalurgicas, Madrid (ES)
- OSTI ID:
- 20015577
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 1-2 Vol. 53; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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