Journal
PHILOSOPHICAL MAGAZINE
Volume 94, Issue 25, Pages 2827-2839Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2014.933906
Keywords
Twinning; twin boundaries; disconnections
Categories
Funding
- Ministry of Education, Youth and Sports of the Czech Republic [CZ.1.07/2.3.00/30.0063]
- Academy of Sciences of the Czech Republic [RVO: 68081723]
- Central European Institute of Technology (CEITEC) [CZ.1.05/1.1.00/02.0068]
- Spanish Secretariat of Research, Development and Innovation [FIS2012-39443-C02-02]
- Catalan Government [AGAUR2014SGR 1644]
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A model of twin growth in magnesium is presented together with the analysis of defects responsible for this growth. The twin interface is represented by {10 (1) over bar2} and basal-prismatic facets. Disclinations are situated in the facet junctions creating dipoles superimposed on basal-prismatic and conjugate twin facets. The migration of facets is mediated by the conservative motion of interfacial disconnections. The {10 (1) over bar2} interfaces contain b(2/2) twinning disconnections. The facet junctions serve as sources and sinks for these defects. Two types of disconnections (b(1/1)(bp) and b(2/2)(bp)) were observed in basal-prismatic boundary. The dipoles of b(2/2)(bp) disconnections were nucleated in the vicinity of existing defects of this type. Interaction of this dipole with existing b(1/1)(bp) leads to the creation of a b(2/2)(bp) disconnection, which is later absorbed in the facet junction. The nucleation of b(2/2)(bp) dipoles was not observed. In twin embryo growth, the basal-prismatic segments remain coherent with a fixed length, while the twin segments grow indefinitely.
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