Superdislocations and antiphase boundary energies in deformed Fe{sub 3}Al single crystals with chromium
Journal Article
·
· Acta Materialia
- ETH Hoenggerberg, Zuerich (Switzerland). Inst. fuer Angewandte Physik
The influence of Cr additions on the positive temperature dependence of the flow stress and on the antiphase boundary (APB) energies of Fe{sub 3}Al was investigated. Single crystals of binary Fe-28 at.% Al and ternary Fe-28 at.% Al-6 At.% Cr were deformed in uniaxial compression between room temperature and 1,273 K. The dislocation arrangement and the dissociation of superdislocations were studied by transmission electron microscopy using the weak-beam technique. The operative slip systems are discussed on the basis of direct measurements of the APB energies. Three types of fault energies of superdislocations were analyzed as a function of temperature (up to 1,003 K) and chromium concentration: the nearest-neighbor APB energy in the cross-slip plane. A procedure for calculating APB energies from effective pair potentials is given. The calculated results are in good agreement with the experimental data.
- OSTI ID:
- 455265
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 2 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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