Abstract
Superdislocations in Al 3 Sc deformed at various temperatures were observed by TEM (transmission electron microscopy). Emphasis was placed on the low temperature range. Below room temperature, dislocations in pile ups dissociated into two a/3<112> superpartials separated by a SISF (superlattice intrinsic stacking fault). At 77 K, triple dislocation nodes separated by SISF were observed. SISF energies estimated from the separation width of superpartial dislocations are 170 mJ m −2 at 77 K, 230 mJ m −2 at 210 K and 290 mJ m −2 at 293 K. The experimentally determined temperature dependence of dissociation mode in Al 3 Sc is similar to that of Co 3 Ti reported previously. Taking into account the results of the above TEM observations and also of strength measurements, the dislocation structure in L1 2 –Al 3 Sc is discussed.
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