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The present article is concerned only with deformation twinning and covers the following topics: (i) formation of twins in high-symmetry structures; (ii) influence of material variables on twinning; (iii) accommodation of deformation twins and their role in crack nucleation; and (iv) emerging new techniques for studying deformation twinning.
Deformation twinning is described by the twinning plane and a twinning direction. Atoms move in the twinning direction by a displacement, generating twinning shear. The twin's structure is a mirror image of the parent structure about the twinning plane.
Deformation. When a fully grown crystal undergoes mechanical stress (such as pressure), the crystal lattice may be distorted. One can imagine this by laying the shell of a matchbox on a table and applying slight pressure to it. The matchbox will shear, distorting its form.
6 kwi 2016 · Due to the scarcity of “easy slip” systems in hexagonal materials with a hexagonal closepacked structure (hcp), deformation twinning plays a crucial role in determining mechanical properties and texture evolution. In this article, we highlight the current understanding of mechanisms and mechanics of the twinning system {1012}〈1011 ...
Deformation by Glide and by Twinning Let's look in a simple but systematic way on how you can deform a crystal. I use an fcc crystal for illustrating this in a <110> projection, i.e. we are looking down the elementary cube as shown in the figures.
Deformation twinning now is a well–known deformation mechanism in cubic and hexagonal crystals. A modern and exhaus-tive account of the current knowledge from the crystallographic, metallurgical and mechanical point of view can be found in (Christian and Mahajan, 1996).
1 cze 2022 · A finite-strain phase-field model of coupled deformation twinning and crystal plasticity is developed in the paper. Twinning is treated as a displacive transformation characterized by a volume-preserving stretch rather than a simple shear, the latter considered in the conventional approach.
