title: Characterizing the boundary lateral to the shear direction of deformation twins in magnesium.
abstract: The three-dimensional nature of twins, especially the atomic structures and motion mechanisms of the boundary lateral to the shear direction of the twin, has never been characterized at the atomic level, because such boundary is, in principle, crystallographically unobservable. We thus refer to it here as the dark side of the twin. Here, using high-resolution transmission electron microscopy and atomistic simulations, we characterize the dark side of deformation twins in magnesium. It is found that the dark side is serrated and comprised of coherent twin boundaries and semi-coherent twist prismatic-prismatic boundaries that control twin growth. The conclusions of this work apply to the same twin mode in other hexagonal close-packed materials, and the conceptual ideas discussed here should hold for all twin modes in crystalline materials.
authors.affiliation: Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: N
authors.initials: N
authors.lastname: Li
authors.affiliation: Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: S
authors.identifier: 0000-0002-4718-2783
authors.initials: S
authors.lastname: Shao
authors.affiliation: Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68583, USA.
authors.forename: M
authors.initials: M
authors.lastname: Gong
authors.affiliation: Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68583, USA.
authors.forename: J
authors.identifier: 0000-0001-5130-300X
authors.initials: J
authors.lastname: Wang
authors.affiliation: Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: McCabe
authors.affiliation: Department of Mechanical Engineering, University of Nevada, Reno, Reno, Nevada 89557, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: C N
authors.initials: CN
authors.lastname: Tomé