Dark CuAl2 precipitates are prominent at the grain boundary triple points in the
more copper rich sample C, and the larger precip4tates often have voids surrounding
them. Networks of dislocations are also visible in some of the grains of this sample.
Sample B (Fig.5) exhibits a much smaller grain size with some small precipitates within
the grains. The small precipitate size precluded ED studies. We also find small (