Open AccessJournal Article
Twinning-like lattice reorientation without a crystallographic twinning plane
Bo-Yu Liu,Jian Wang,Bin Li,Lu Lu,Xi-Yan Zhang,Zhi-Wei Shan,Ju Li,Chun-Lin Jia,Jun Sun,Evan Ma +9 more
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TLDR
By monitoring the deformation of submicron-sized single-crystal magnesium compressed normal to its prismatic plane with transmission electron microscopy, the reorientation of the parent lattice to a ‘twin’ lattice is monitored, producing an orientational relationship akin to that of the conventional twinning, but without a crystallographic mirror plane and giving plastic strain that is not simple shear.Abstract:
Twinning on the plane is a common mode of plastic deformation for hexagonal-close-packed metals. Here we report, by monitoring the deformation of submicron-sized single-crystal magnesium compressed normal to its prismatic plane with transmission electron microscopy, the reorientation of the parent lattice to a 'twin' lattice, producing an orientational relationship akin to that of the conventional twinning, but without a crystallographic mirror plane, and giving plastic strain that is not simple shear. Aberration-corrected transmission electron microscopy observations reveal that the boundary between the parent lattice and the 'twin' lattice is composed predominantly of semicoherent basal/prismatic interfaces instead of the twinning plane. The migration of this boundary is dominated by the movement of these interfaces undergoing basal/prismatic transformation via local rearrangements of atoms. This newly discovered deformation mode by boundary motion mimics conventional deformation twinning but is distinct from the latter and, as such, broadens the known mechanisms of plasticity.read more
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Large plasticity in magnesium mediated by pyramidal dislocations
Bo-Yu Liu,Fei Liu,Nan Yang,Xiao Bo Zhai,Lei Zhang,Yang Yang,Bin Li,Ju Li,Evan Ma,Jian Feng Nie,Jian Feng Nie,Zhi-Wei Shan +11 more
TL;DR: It is found that submicrometer-size magnesium samples exhibit high plasticity that is far greater than for their bulk counterparts, which should allow development of high-ductility magnesium and other metal alloys.
Journal ArticleDOI
Disconnections and other defects associated with twin interfaces
J.P. Hirth,Jun Wang,C.N. Tomé +2 more
TL;DR: In this article, the general topological model for interfacial defects is reviewed and expanded, and the role of these defects in the coupled shear migration of interfaces is explored, focusing on twinning in hexagonal metals for many defect examples.
Journal ArticleDOI
Magnesium interatomic potential for simulating plasticity and fracture phenomena
TL;DR: In this paper, a modified embedded-atom method potential for magnesium is introduced and rigorously validated against existing ab initio, continuum theory and experimental results, which satisfactorily reproduces all the necessary mechanical properties for plastic deformation, including the various generalized stacking fault energy surfaces, dislocations core structures, Peierls stresses, surface energies and basal plane cohesive strength.
Journal ArticleDOI
On the role of twinning and stacking faults on the crystal plasticity and grain refinement in magnesium alloys
Suqin Zhu,Simon P. Ringer +1 more
TL;DR: In this article, the authors investigated the detailed microstructural mechanisms associated with the excellent crystal plasticity and ultra-fine grain refinement observed under high strain-rate deformation of Mg alloys, focusing on ZK60.
Journal ArticleDOI
First-principles study of energy and atomic solubility of twinning-associated boundaries in hexagonal metals
TL;DR: In this paper, the structural properties of TB and the solubility at TB were investigated using first-principles density function theory, with the focus on the structural character of TB.
References
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Journal ArticleDOI
Slip, twinning, and fracture in hexagonal close-packed metals
TL;DR: The role of deformation twinning in fracture of hexagonal close-packed metals is reviewed from a theoretical point of view in this paper, where strength and ductility are correlated with the intrinsic physical and metallurgical variables.
Journal ArticleDOI
On deformation by twinning
F.C Frank,N Thompson +1 more
TL;DR: In this article, the authors focus on the distinction between the strain due to complete twinning and the macroscopic strain caused by formation of a thin twin lamella, and the subdivision of the orientation diagram according to the twinning system which can be operated by axial loading is a more complicated one than customarily indicated.
Journal ArticleDOI
Deformation twinning in nanocrystalline materials
TL;DR: In this paper, a review of deformation twinning in nanocrystalline materials is presented, including deformation twins observed by molecular dynamics simulations and experiments, twinning mechanisms, factors affecting the twinning, analytical models on the nucleation and growth of deformations, interactions between twins and dislocations, and the effects of twins on mechanical and other properties.
Journal ArticleDOI
Coupling grain boundary motion to shear deformation
TL;DR: In this paper, the coupling factor between the normal grain boundary (GB) motion and grain translations has been calculated by molecular dynamics simulations over the entire misorientation range and a wide range of temperatures, showing an abrupt switch from one branch to another at a tilt angle of about 35°.
Book
Elementary Dislocation Theory
TL;DR: In this article, the authors describe the stress field around a Dislocation and the forces on the Dislocations, as well as the effects of point defect on point defects.