Abstract
Abstract A simple statistical analysis of the structure or superdislocations in L12 compounds displaying the yield strength anomaly is developed. This analysis is based on the superkink model of dislocation dynamics, where it is assumed that a superdislocation propagates through the lateral motion of superkinks. The analysis is used to assess the probability that a superdislocation is immobile, and this probability is found to depend exponentially on the nominal length of the superdislocation. The statistical analysis requires knowledge of the global distribution of superkink lengths to obtain quantitative relative immobilization rates; this information is extracted from published experimental work and also from previous simulations. The implications of both superkink distributions are explored. The predictions of the analysis appear consistent with the results from simulations.
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