This work was undertaken to evaluate the applicability of the Ashby grain-boundary hardening model for a high strain range.To this end,Al Mg alloy with distinctly different grain sizes(~100μm vs^1μm)was cold-rolled ...This work was undertaken to evaluate the applicability of the Ashby grain-boundary hardening model for a high strain range.To this end,Al Mg alloy with distinctly different grain sizes(~100μm vs^1μm)was cold-rolled to a true strain of^1.6 and the resulting dislocation densities were compared by using transmission electron microscopy.A minor difference revealed by the measurements suggested a violation of the Ashby’s model.This effect was attributed to a partial relaxation of strain constraints due to significant change of grain shape,development of texture and formation of pronounced substructure.展开更多
基金financially supported by the Russian Science Foundation, grant No.18-79-10174
文摘This work was undertaken to evaluate the applicability of the Ashby grain-boundary hardening model for a high strain range.To this end,Al Mg alloy with distinctly different grain sizes(~100μm vs^1μm)was cold-rolled to a true strain of^1.6 and the resulting dislocation densities were compared by using transmission electron microscopy.A minor difference revealed by the measurements suggested a violation of the Ashby’s model.This effect was attributed to a partial relaxation of strain constraints due to significant change of grain shape,development of texture and formation of pronounced substructure.