It was noted that <1¯1¯•6>{11•1} pyramidal slip in this material exhibited the so-called yield stress anomaly. Near to the peak-stress temperature, the specimens collapsed via shearing on {11•1} slip planes; almost immediately after yielding. Transmission electron microscopy revealed that pairs of unlike 1/6<1¯1¯•6>{11•1} super-partial dislocations, coupled by antiphase boundary, were generated within the same temperature range. These super-partials were of edge type and were shown to climb-dissociate, on the basal plane, into partials of smaller Burgers vector which bounded a complex stacking fault. The dissociation could be described by the equation:

1/6<1¯1¯•6>  1/6<1¯0•3> + 1/6<01¯•3>

The fracture of monocrystals at high temperatures was associated with the locking of 1/6<1¯1¯•6> super-partials by climb dissociation.

Locking of 1/6<1126>{1121} Superpartials in Ti3Al at High Temperatures. Y.Minonishi: Proceedings of the Japan Academy B, 1995, 71[8], 260-4