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Tailoring the Plasticity of Topologically Close-Packed Phases via the Crystals' Fundamental Building Blocks.
- Source :
-
Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2023 Jun; Vol. 35 (24), pp. e2300586. Date of Electronic Publication: 2023 Apr 27. - Publication Year :
- 2023
-
Abstract
- Brittle topologically close-packed precipitates form in many advanced alloys. Due to their complex structures, little is known about their plasticity. Here, a strategy is presented to understand and tailor the deformability of these complex phases by considering the Nb-Co µ-phase as an archetypal material. The plasticity of the Nb-Co µ-phase is controlled by the Laves phase building block that forms parts of its unit cell. It is found that between the bulk C15-NbCo <subscript>2</subscript> Laves and Nb-Co µ-phases, the interplanar spacing and local stiffness of the Laves phase building block change, leading to a strong reduction in hardness and stiffness, as well as a transition from synchroshear to crystallographic slip. Furthermore, as the composition changes from Nb <subscript>6</subscript> Co <subscript>7</subscript> to Nb <subscript>7</subscript> Co <subscript>6</subscript> , the Co atoms in the triple layer are substituted such that the triple layer of the Laves phase building block becomes a slab of pure Nb, resulting in inhomogeneous changes in elasticity and a transition from crystallographic slip to a glide-and-shuffle mechanism. These findings open opportunities to purposefully tailor the plasticity of these topologically close-packed phases in the bulk by manipulating the interplanar spacing and local shear modulus of the fundamental crystal building blocks at the atomic scale.<br /> (© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-4095
- Volume :
- 35
- Issue :
- 24
- Database :
- MEDLINE
- Journal :
- Advanced materials (Deerfield Beach, Fla.)
- Publication Type :
- Academic Journal
- Accession number :
- 36930795
- Full Text :
- https://doi.org/10.1002/adma.202300586