Influence of Free Surface Orientation on Plasticity Nucleation in BCC Metals

AV Korchuganov and KP Zolnikov and DS Kryzhevich, PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES, 2051, 020133 (2018).

DOI: 10.1063/1.5083376

The peculiarities of plasticity nucleation in iron nanowires under uniaxial tension along different crystallographic directions were investigated. The study was carried out on the basis of molecular dynamics calculations. It was shown that the nucleation of plasticity in samples is associated with the nucleation of either twins or dislocations. The tension of a single crystal sample along the 11 (2) over bar direction leads to the nucleation and growth of a twin. In this case, dislocations generate and propagate only in the body of the formed twin. The tension of the sample along the 1 (1) over bar0 direction resulted in the nucleation of numerous twins at the front of which regions with fee and hcp lattices arise. During tension along the 111 direction, the plasticity nucleation is associated with an avalanche-like generation of screw dislocations. Formed dislocations escape on free surfaces and leave a large number of vacancies in the sample.

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