Microstructural evidence for dynamic recrystallization during creep of a duplex near-{gamma} TiAl-alloy

Journal Article · Tue Nov 03 04:00:00 EST 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00346-7· OSTI ID:289474

Skrotzki, B; Rudolf, T; Eggeler, G ^[1]; Dlouhy, A ^[2]

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1. Ruhr-Univ., Bochum (Germany). Inst. for Materials
2. Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics and Materials

Intermetallic near-{gamma} titanium aluminides (TiAl) have attractive properties such as high strength, low density, good oxidation resistance and good high temperature properties. In the present study the authors consider an alloy with duplex microstructure which is attractive in combining good creep strength with reasonable ductility. In order to be able to safely use such materials for high temperature components operating in the creep range, the mechanical creep behavior has to be well characterized and the dominating microstructural creep processes must be understood. Dynamic recrystallization can occur during high temperature plastic deformation, i.e, hot working (rolling, extrusion, forging) or creep and represents a softening process. It is presently not clear how much dynamic recrystallization affects the creep rate and what role it plays in the overall creep deformation mechanism. The objective of the present study was to (i) determine whether dynamic recrystallization occurs during creep of the duplex material studied here at stresses and temperatures which are low in comparison to the large majority of literature experiments, (ii) identify the critical condition for the onset of dynamic recrystallization and (iii) perceive the role of dynamic recrystallization as part of the creep mechanism in TiAl based alloys.

• OSTI ID: 289474
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 11 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CREEP
DISLOCATIONS
GRAIN GROWTH
INTERMETALLIC COMPOUNDS
RECRYSTALLIZATION
STRAINS
STRESSES
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS