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​The kinematic and isotropic strain hardening was investigated in columnar-grained copper withpreferentially oriented nanoscale twins deformed at two different strain rates of 5 × 10-5and5 × 10-3s-1

Time:2019-04-25Source:HGIView:17

The kinematic and isotropic strain hardening was investigated in columnar-grained copper withpreferentially oriented nanoscale twins deformed at two different strain rates of 5 × 10-5and5 × 10-3s-1. A significant back stress is caused majorly by threading dislocation pile-up and accumulation at the grain boundaries and is strain rate independent. The isotropic hardening associatedwith an increment in the local effective stress stems from dislocation storage at twin boundaries, anda high strain rate is beneficial for enhancing isotropic strain hardening and tensile ductility.