On the role of mechanical twinning in creep of a near-{gamma} TiAl-alloy with duplex microstructure
- Ruhr-Univ. Bochum (Germany). Inst. for Materials
Near-{gamma} titanium aluminides (TiAl) have received considerable attention in recent years due to their high strength, low density, good oxidation resistance and good high temperature properties. Early microstructural studies of creep in this class of materials focused on single phase equiaxed ({gamma}) and fully lamellar ({alpha}{sub 2}/{gamma}) alloys. In the present study the authors consider an alloy with duplex microstructure (which is attractive in combining good creep strength with reasonable ductility) consisting of equiaxed single phase {gamma}-grains and equiaxed colonies of {alpha}{sub 2}/{gamma}-lamellae which the authors simply refer to as lamellar grains throughout this study. The objective of the present study is to contribute to a better understanding of the role of creep deformation twinning in near-{gamma} duplex TiAl alloys in studying its dependence on stress, temperature and strain. Special emphasis is placed on the role of early twinning for small accumulated strains.
- OSTI ID:
- 665211
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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