Publication detail

On the relationship between {1 1 2¯ 2} and {1 1 2¯ 6} conjugate twins and double extension twins in rolled pure Mg

OSTAPOVETS, A. BURŠÍK, J. KRAHULA, K. KRÁL, L.

Czech title

Vztah mezi {112 2} a {112 6} konjugací dvojčat a dvojitým rozšířením dvojčat v čistém válcovaném Mg

English title

On the relationship between {1 1 2¯ 2} and {1 1 2¯ 6} conjugate twins and double extension twins in rolled pure Mg

Type

journal article - other

Language

en

Original abstract

The paper presents a new type of twin-like objects observed in rolled pure magnesium. They have and habit planes and their misorientations to the matrix are close to 56° and 63° about axis, respectively. The ad hoc performed theoretical analysis and atomic simulations allow to interpret the objects as double twins formed by the simultaneous action of two twinning shears with completely re-twinned volume of primary twin. The observed inclinations from the ideal misorientations for such double twins can be explained by the compliance of the strain invariant condition in the twin boundary. It seems plausible that, once the double twin is formed, its twin boundaries are hard to move by glide of twinning disconnections. If so, these twins represent obstacles for the motion of crystal dislocations increasing the hardness of the metal.

Czech abstract

Tento článek prezentuje nový typ objektů schopných dvojčatění pozorovaných v čistém Mg. Mají habitovou rovinu a jejich misorientace v matrici je 56° a 63° vzájemně od osy. Pro tento případ jsou provedeny teoretické analýzy a atomová simulace dovolující interpretovat tyto objekty jako „dvojitá dvojčata“ formovaná současnou akcí ve dvou dvojčatových smycích (střizích) s kompletním „předvojčatěním“objemu primárních dvojčat. Pozorované dispozice pro ideální misorientace pro takováto „dvojitá dvojčata“ mohou být vysvětlena shodou neměnných podmínek napětí na hranicích dvojčat. Toto se jeví jako hodnověrné, jakmile se dvojitá dvojčata zformují, jejich dvojčatové hranice jsou těžko pohyblivé pro skluz v dvojčatovém odpojení. Je- li tomu tak, tato dvojčata reprezentují překážky pro pohyb dislokací v krystalu a vzrůstá tvrdost kovu.

English abstract

The paper presents a new type of twin-like objects observed in rolled pure magnesium. They have and habit planes and their misorientations to the matrix are close to 56° and 63° about axis, respectively. The ad hoc performed theoretical analysis and atomic simulations allow to interpret the objects as double twins formed by the simultaneous action of two twinning shears with completely re-twinned volume of primary twin. The observed inclinations from the ideal misorientations for such double twins can be explained by the compliance of the strain invariant condition in the twin boundary. It seems plausible that, once the double twin is formed, its twin boundaries are hard to move by glide of twinning disconnections. If so, these twins represent obstacles for the motion of crystal dislocations increasing the hardness of the metal.

Keywords in Czech

Hořčík, dvojčatění, ohraničení zrn, plastická deformace, habitová rovina

Keywords in English

Magnesium, twinning, grain boundaries, plastic deformation, habit plane

Released

28.02.2017

ISSN

1478-6443

Volume

97

Number

14

Pages from–to

1188–1101

Pages count

14

BIBTEX


@article{BUT134742,
  author="Andriy {Ostapovets} and Jiří {Buršík} and Karel {Krahula} and Lubomír {Král},
  title="On the relationship between {1 1 2¯ 2} and {1 1 2¯ 6} conjugate twins and double extension twins in rolled pure Mg",
  year="2017",
  volume="97",
  number="14",
  month="February",
  pages="1188--1101",
  issn="1478-6443"
}