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A numerical calculation is described which determines the blocking radius of a pile-up of negative edge dislocations to a group of either negative or positive edge dislocations with the same Burgers vector. The results are used to calculate the work-hardening rate in stage II of face-centred-cubic single crystals in the theory of Hirsch and Mitchell (1967).
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P. M. Hazzledine (1971) studied this question.
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