The influence of impurities on the modulus effect of cold worked copper

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Abstract
The decrease of the rigidity modulus due to cold working, the so-called ΔG effect, was measured on pure Cu and Cu with 3·3 × 10−2 6·7 × 10−2 and 10 × 10−2 at. % Au respectively, as a function of deformation. The ΔG effect decreases with increasing Au concentration. Starting from simple assumptions, the length and density of dislocations can be estimated from the experimental results as a function of the degree of cold work.