The theory of an obstacle-controlled yield strength—Report after an international workshop

From May 29 to June 1, 1976, a workshop** was held at Argonne National Laboratory to consider and assess the current status of the theory of strengthening mechanisms -insofar as these are controlled by fixed obstacles of limited extent in the slip plane, such as precipitates, solute atoms, and possibly forest dislocations. (Excluded were the lattice resistance, long-range stresses, effects of grain boundaries and the like.) Six half-day sessions were held, each concentrating on one problem area, which was reported on by one or two speakers and amply discussed. A final day was devoted to general discussions and ancillary problems. The motivation for the meeting was that, at least in the opinion of the organizer, significant advances had been made in the last two years which promise, eventually, to put yield strength theory on a quantitative footing. In the past, uncertainties in the value of the predicted flow stress for a given alloy have been of the order of a factor of 2 10; this margin of error may well be reduced to the order of 20% in the foreseeable future,

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