Abstract
A transmission electron microscope (TEM) investigation of surface defects contained in an as-grown Ti 3Al + V ordered alloy (DO19) was carried out and evidence was obtained for two categories of defects, namely antiphase boundaries (APB) and superlattice intrinsic stacking faults (SISF). APBs are nonplanar, they are thermal defects that were formed during alloy ordering ; they are often terminated by a superpartial with a 1/6 Burgers vector. SISFs appear as groups of several unities, they do not originate from superdislocation dissociation but are part of closed superpartial loops with 1/3 Burgers vector. SISFs and APBs may interact in order to give complex configurations that have been analyzed by TEM. Several different types of intersections between a SISF and an APB may occur which all indicate a rather weak interaction between a SISF and a 1/6 superpartial.
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