A quantitative assessment of forest-hardening in f.c.c. metals

摘要: Abstract Macroplastic deformation results from the long-distance movement of dislocations. In singlephase crystals it implies cutting dislocation forest traversing slip plane running dislocations and, as a consequence non-regular distribution “trees”, loops are left around harder islands in their planes. The length so stored represents an increment obstacle density already present other non-coplanar systems and thus contributes to work-hardening. This work presents quantitative on contribution by f.c.c. metal upon flow stress hardening rate. It has been obtained computer simulation glide through mixture punctual linear obstacles whose strengths reproduce approximately strength spectrum derived Shoeck Frydman. Simulations have conducted for random arrays more realistic spatial distributions (cells, subgrains). Both (and its temperature strain rate dependence) athermal work-hardening good agreement with those measured polycrystals experiments covering up large strains.