H. Rosner et al., DISLOCATION MECHANISMS IN AL-RICH AL-LI ALLOYS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 234, 1997, pp. 298-301
Thin foils of two binary delta'-strengthened Al-rich Al-Li alloys have
been tensile tested inside a transmission electron microscope (TEM) a
t temperatures ranging from 293 to 373 K. The volume fraction of the d
elta'-precipitates was 0.047 and 0.099 and their average radius 6.7 an
d 9.6 nm, respectively. These experiments yield information concerning
the following points: (i) activated glide planes; (ii) dislocation co
nfigurations (paired and unpaired dislocations); (iii) jerky motion; (
iv) planar slip and cross-slip; and (v) bowing out of the leading disl
ocations in comparison to the trailing ones. These results are discuss
ed with reference to those obtained for gamma'-hardened Ni-base supera
lloys. (C) 1997 Elsevier Science S.A.