Positron lifetimes and effective trapping rates were determined in high-purity monocrystals which had been deformed in tension, via single and double slip. The dislocation densities were determined by means of high-resolution resistometry. It was found that the lifetimes seemed to reflect the Burgers vectors which were present, and the specific trapping rates exhibited a marked dependence upon the dislocation densities. The results indicated that positron annihilation could be useful for measuring dislocation densities in face-centered cubic metals; especially low-purity metals or alloys.

V.Gröger, T.Geringer, W.Pichl, G.Krexner, I.Novotný, I.Procházka: Materials Science Forum, 1996, 210-213, 743-50