Investigation on APBs and dissociation of super dislocations in TiAl by APFIM
- 1 September 1991
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Letters
- Vol. 64 (3) , 117-124
- https://doi.org/10.1080/09500839108214676
Abstract
The atomic stacking sequence along the 〈001〉 direction in γ-TiAl (L10 type of structure) of an as-cast two phase TiAl/Ti3Al intermetallic alloy with Cr and Si additions has been investigated by field ion microscopy (FIM) and supported atom probe microanalysis. The γ-phase possesses a high degree of ordering. During cooling thermally formed (100) antiphase boundaries (APBs), super dislocations, as well as super partial dislocations were observed and detected by APFIM. From this it is suggested that the addition of Cr lowers the APB energy in TiAl and the origin of the APBs is related to the displacement of 1/2〈011〉 super partial dislocations.Keywords
This publication has 6 references indexed in Scilit:
- Field ion microscopy and atom probe investigations on two phase intermetallic TiAlTi3Al alloyScripta Metallurgica et Materialia, 1991
- Orientation faults of γ lamellae in a Ti-40 at% Al alloyScripta Metallurgica et Materialia, 1991
- Antiphase domains and {011} twins in TiAlPhilosophical Magazine Letters, 1990
- The deformation behaviour of intermetallic superlattice compoundsProgress in Materials Science, 1990
- Twin relationships in TiAlScripta Metallurgica, 1988
- Weak-beam observation of a dissociation transition in TiAlPhilosophical Magazine A, 1988