LATENT HARDENING BEHAVIOR OF MONOCRYSTALLINE AL-MG SOLID-SOLUTION

The latent hardening behavior of dilute Al-Mg single crystal was inves tigated in this study. We performed the latent hardening tests on five systems, one in each of the five system groups. The latent hardening ratios (LHR) end the hardening rates were calculated. The LHR of syste ms that form attractive junctions is highest in this investigation. Th e LHRs of systems that form Lomer-Cottrell sessile locks, Hirth locks, or cross-slip systems are in the middle range. The coplanar system ha s the lowest LHR, which is in agreement with the theoretical predictio n. An equation was developed that correlates the LHR with the dislocat ion densities at various prestrain values. The secondary deformation c urve is predicted qualitatively in accordance with the interaction str ength of the latent system with the primary system. Based on such a mo del, a prediction of the shapes of the secondary deformation curves in the strongest and weakest latent systems can be made.