Dispersion strengthening

Using digital computer-based methods, models for dispersion strengthening can now be developed which take into account many of the important effects that have been neglected in the past. In particular, the self interaction of a dislocation can be treated, and a computer simulation method to determine the flow stress of a random distribution of circular, impenetrable obstacles has been developed taking into account all such interactions. The flow stress values depend on the obstacle sizes and spacings, over and above the usual 1/L dependence, where L is the average obstacle spacing. From an analysis of the results, it was found that the main effects of the self-interactions can be captured in a line tension analog in which the obstacles appear to be penetrable