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Distribution of dislocations and twins in copper and 18Cr-10Ni-Ti steel under shock-wave loading

I. N. Borodin^ab, S. A. Atroshenko^a, A. E. Mayer<sup>b

a</sup> Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg
^b Chelyabinsk State University

Abstract: The distribution of dislocations and twins over the cross section of shock-loaded copper and 18Cr-10Ni-Ti steel specimens is investigated experimentally and numerically. It is found that the volume fraction of twins near the loaded surface and a spall crack is an order of magnitude higher than their fraction at the center of the target. The features of twins arising in different parts of the target are discussed. A model of a twinning mechanism in coarse-grained metals is proposed and used for numerical simulation of the dislocation and twin depth distribution in shock-loaded targets. It is shown that in thin targets (less than 1 mm thick), the distribution of twins can be even more uniform than the distribution of the dislocations density.

Received: 11.11.2013

 English version: Technical Physics, 2014, 59:8, 1163–1170

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