TEM investigation of non-crystallographic displacements near antiphase domain boundaries in D0{sub 3} ordered Fe{sub 3}Al
- Westfaelische Wilhelms-Universitaet Muenster (Germany). Institut fuer Metallforschung
- Academy of Sciences of the Czech Republic, Prague (Czech Republic). Inst. of Physics
Antiphase domain boundaries (APBs) have been studied by means of transmission electron microscopy in a D0{sub 3} long-range ordered Fe{sub 3}Al single crystal. Two types of APB contrasts have been observed. The normal {pi}-type APB contrast was imaged with superlattice reflections. This type of contrast is caused by the basic displacement R{sub 0} = 1/4{l_angle}111{r_angle} or 1/2{l_angle}111{r_angle} across the APB. On the other hand, the anomalous {alpha}-type APB contrast was imaged with fundamental reflections. The latter contrast was weak, asymmetric in dark field and discontinuous along a close APB loop. It has been demonstrated that the anomalous {alpha}-type contrast is caused by a small non-crystallographic displacement r of atoms near the APBs. Detailed examination of the anomalous APB contrast indicated that the fault vector r depends on the basic displacement R{sub 0} as well as on the APB orientation. The main component of r was found to be perpendicular to the APBs with R{sub 0} = 1/4{l_angle}111{r_angle}. The addition displacement is discussed in terms of the mechanical and chemical relaxations of the APBs and with reference to the anomalous plastic behavior of Fe{sub 3}Al.
- OSTI ID:
- 302354
- Journal Information:
- Acta Materialia, Vol. 46, Issue 17; Other Information: PBD: 2 Nov 1998
- Country of Publication:
- United States
- Language:
- English
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