Latent hardening of germanium crystals

The latent hardening of six secondary glide systems of germanium crystals h as been measured at the begin of easy glide. The results can be explained i n case of intersecting systems by adding a term for forest interaction to t he flow stress of single slip. This term amounts to (alpha Gb rootN(f)) wit h alpha approximate to 0.35 for various types of dislocation cutting, and a lpha = 0.64 for the cross glide system. (G being the appropriate shear modu lus, b the length of the Burgers Vector and N-f the density of forest dislo cations). The Bauschinger effect seems to confirm the anisotropy of disloca tion mobility detected by Farber and Iunin.