In situ TEM observations of dislocation processes in iron-aluminides with 25 and 30 at.% aluminium
✍ Scribed by H. Rösner; G. Molénat; E. Nembach
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 833 KB
- Volume
- 216
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
Thin single crystal foils of long-range ordered binary iron-aluminium alioys with 25 and 30 at.% aluminium have been tensile tested inside of a transmission electron microscope. The motion of dislocations has been recorded under full load at temperatures ranging from 300 to 970 K. These experiments yield information pertaining to: i) the activated glide planes; ii) the mode of glide (viscous versus jerky and planar versus cross-slip); iii) the dissociation of perfect dislocations into partials and the magnitude of the partial Burgers vectors; and iv) the widths and specific energies of the antiphase boundaries between the partial dislocations. The results are discussed with a view to elucidating the well-known anomalous, positive temperature dependence of the critical resolved shear stress of these intermetallic compounds between 500 and 780 K.