Institute of Physics of Materials AS CR, v. v. i. > Projects > Interplay of plasticity and magnetism in alpha-iron and chromium

Interplay of plasticity and magnetism in alpha-iron and chromium

Investigatordoc. Ing. Roman Gröger, Ph.D.
Number of Project19-23411S
AgencyGrantová agentura České republiky
Duration2019-01-01 - 2021-12-31

Anotace
Ferromagnetic alpha-Fe and antiferromagnetic Cr crystallize in the body-centered cubic (bcc) structure that exhibits internal magnetic order. This non-close-packed crystal structure implies complex behavior od 1/2<111> screw dislocations, which cannot be explained using the Schmid law. Moreover, the role of magnetism on the plastic behavior of these metals has never been elucidated. The aim of this project is to fill the gap in knowledge about the coupling of magnetism and plasticity in alpha-Fe and Cr by: (i) carrying out detailed low-temperature experiments on high-purity single crystals of both metals under tension and compression, and (ii) theoretical and computational studies using magnetic Bond Order Potentials and DFT to expose the connection between the strains around dislocations and changes of magnetic properties in their vicinity. Low-temperature magnetic measurements and magnetic force microscopy on as-received and magnetized samples and the subsequent TEM studies will serve to quantify the interaction between magnetism and plasticity in these materials.


2021

Gröger R., Šremr J., Vydrová J.: Uniqueness and stability of activated dislocation shapes in crystals. Model. Simul. Mater. Sci. Eng. 29 (2021) 025006

Holzer J., Chlup Z., Kruml T., Gröger R.: Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K. Int. J. Plast. 138 (2021) 102938

Gröger R.: Symmetry-adapted single crystal yield criterion for non-Schmid materials. Int. J. Plast. 146 (2021) 103101



2020

Gröger R., Vítek V.: Single crystal yield criterion for chromium based on atomistic studies of isolated 1/2[111] screw dislocations. Int. J. Plast. 132 (2020) 102733