Publication detail

Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K

HOLZER, J. KRUML, T. GRÖGER, R. CHLUP, Z.

Original Title

Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K

Type

journal article in Web of Science

Language

English

Original Abstract

A series of compression tests at 77 K was carried out on chromium single crystals in magnetically isotropic state to investigate the slip activity during the first 2-4% of plastic strain. Macroscopic samples of 3 mm thickness were polished mechanically and electrolytically and their orientations determined before and after deformation by electron backscatter diffraction to assess the magnitudes and directions of crystal rotations. The crystals compressed in the direction close to [001] deformed primarily by slip on the most highly stressed (101)[111] and (101)[111] systems. Loading the crystals in the directions close to the [011] [111] edge of the stereographic triangle resulted in preferential twinning on {112}111 systems. For loading in the center-triangle region, diffraction contrast imaging in TEM reveals the presence of [100] screw junctions between intersecting 1/2[111] and 1/2 [111] screw dislocations. Using molecular statics simulations, we show that this junction does not break under the applied stress and moves together with the two dislocations on their common (011) plane. In contrast to the prediction of the Schmid law, the slip morphology for center-triangle orientations is thus dominated by anomalous slip on the low stressed (011) plane.

Keywords

Chromium; Anomalous slip; TEM; Atomistic simulations; 77 K

Authors

HOLZER, J.; KRUML, T.; GRÖGER, R.; CHLUP, Z.

Released

1. 3. 2021

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

Location

OXFORD

ISBN

1879-2154

Periodical

INTERNATIONAL JOURNAL OF PLASTICITY

Year of study

138

Number

102938

State

United Kingdom of Great Britain and Northern Ireland

Pages from

102938

Pages to

102956

Pages count

19

URL

https://www.sciencedirect.com/science/article/pii/S0749641921000139

BibTex

@article{BUT180087,
  author="Jakub {Holzer} and Tomáš {Kruml} and Roman {Gröger} and Zdeněk {Chlup}",
  title="Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K",
  journal="INTERNATIONAL JOURNAL OF PLASTICITY",
  year="2021",
  volume="138",
  number="102938",
  pages="19",
  doi="10.1016/j.ijplas.2021.102938",
  issn="1879-2154",
  url="https://www.sciencedirect.com/science/article/pii/S0749641921000139"
}