Institute of Physics of Materials AS CR, v. v. i. > Projects > Mechanisms of plastic deformation and twinning interfaces in hexagonal metals

Mechanisms of plastic deformation and twinning interfaces in hexagonal metals

InvestigatorMgr. Andrej Ostapovec, Ph.D.
Number of Project16-14599S
AgencyGrantová agentura České republiky
Duration2015-12-31 - 2018-12-30

Anotace
anglicky Twinning is an important mode of plastic deformation in materials with hexagonal crystal structure. Mechanisms of the twinning in hcp materials are far from being understood. Non-Schmid behaviors of twinning and non-invariant twin interfaces were observed recently in magnesium, cobalt and titanium. The twin interfaces and mechanisms of their formation and mobility will be investigated in this project. Structure of non-classical twin interfaces will be studied as well as the structure of linear defects (e.g. dislocations and disconnections) responsible for migration of such interfaces. Influence of twin boundary faceting on twinning kinetics will be also investigated and described.

Cíle projektu anglicky:
Analysis of some aspects of twinning in hexagonal close packed materials (magnesium, cobalt,titanium, zirconium): formation mechanisms of non-classical twin interfaces and twin boundary faceting, mechanisms of their migration and influence on twinning kinetics.
Publications

2018

Ostapovec A., Čapek J., Paidar V.: Secondary twinning in zinc. Philos. Mag. Lett. 98 (2018) 437-445

Káňa T., Ostapovec A., Paidar V.: The matrix-twin transition in a perfect Mg crystal: Ab initio study. Int. J. Plast. 108 (2018) 186-200

Sun Q., Ostapovec A., Zhang X., Tan L., Liu Q.: Investigation of twin-twin interaction in deformed magnesium alloy. Philos. Mag. 98 (2018) 741-751

Paidar V., Ostapovec A., Káňa T.: Dislocation Content of Non-Classical Twin Boundaries in Hexagonal Metals . Acta Phys. Pol. A 134 (2018) 692-694

Paidar V., Šob M., Vítek V.: Dislocation dissociations in C11b MoSi2 and their impact on its plastic deformation. Intermetallics 97 (2018) 34-41

Ostapovec A., Paidar V.: Some aspects of double twinning in hexagonal metals. Low Temp. Phys. 44 (2018) 1241-1244

Ostapovec A., Vatazhuk O.: Non-Schmid behavior of extended dislocations in computer simulations of magnesium. Comp. Mater. Sci. 142 (2018) 261-267


2017

Ostapovec A., Buršík J., Krahula K., Král L., Serra A.: On the relationship between (1 1 -2 2) and (1 1 -2 6) conjugate twins and double extension twins in rolled pure Mg. Philos. Mag. 97 (2017) 1088-1101

Ostapovec A., Vatazhuk O.: Peierls barriers of a-type edge and screw dislocations moving on basal and prismatic planes in magnesium. Low Temp. Phys. 43 (2017) 421-427

Ostapovec A., Serra A.: Slip dislocation and twin nucleation mechanisms in hcp metals. J. Mater. Sci. 52 (2017) 533-540

Paidar V., Ostapovec A.: The balance between the energies of the symmetric (10-12) twin boundaries and asymmetric basal/prismatic interfaces in hcp metals. Mater. Lett. 198 (2017) 93-96