Anomalous growth of antiphase domains in Ti3Al

Anomalous antiphase domain (APD) growth was observed in Ti3Al after prolonged annealing, and its mechanism was investigated by detailed transmission electron microscopy observation. Significant numbers of dislocations were observed around anomalously coarsened APDs, and APD boundaries (APDBs) were terminated with dislocations having non-c-axis components of Burgers vectors (b) parallel to the phase-shift vector R of the APDBs. This implies that the anomalous APD coarsening occurs via APDB elimination by motion of superpartial dislocations whose bs can cancel the R of APDBs.