The initiation of serrated yielding at elevated temperatures

It is well established that at temperatures above ∼0·3 T m the Cottrell theory relating the critical strain for serrated yielding, ε0, to temperature and strain rate becomes inapplicable. At these elevated temperatures ε0 increases with increasing temperature and decreasing strain rate. These phenomena may be rationalized on the basis that during the high temperature critical strain dislocations move only in conjunction with a solute atmosphere.