WORK-HARDENING BEHAVIOR AND SUBGRAIN SIZE DISTRIBUTION OF HOT WORKED ALUMINUM

The subgrain structure of hot worked aluminium was found to remain geo metrically self similar for various deformation conditions, under goin g only alteration in size as the flow, stress changes. The stress and temperature related alterations of the subgrain size distributions hav e been described mathematically by the two parameters of the lognormal probability function which fits the experimental data. It has been fo und that the rate of scaling of the structure changes in stage IV work hardening. Experimental observations and statistical considerations s uggest that the lognormal character of the subgrain size distribution arises as a result of a multiplicative interaction of recovery process es. MST/3760.