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Abstract
The grain boundary character distribution strongly affects the properties of polycrystalline materials. Grain boundaries of similar characters form networks, whose topological invariants can be considered as distribution descriptors. Understanding the evolution of such descriptors during severe plastic deformations (SPD) can elucidate the evolution of properties and underpin the design of processing routes for target behaviour. For topological analysis of grain boundary networks, polycrystalline materials are considered here as polyhedral complexes with grain boundaries classified into two types - low-angle and high-angle. Changes of grain boundary types are calculated using sub-grain rotations, which reflects the physical mechanism of microstructure evolution during SPD. A non-physical approach, by direct conversions of low-angle to high-angle boundaries, is also explored as a reference to demonstrate the impact of the physical constraint imposed by rotations. Reported is the discovery of topological phase transitions in the grain boundary networks which might take place during severe plastic deformations of different copper alloys. Depending on the evolution approach, the transitions correspond to zeros of the Euler characteristic, or of the logarithm of the inverse connectivity, of the grain boundary network. The relations between these transitions and the fraction of high-angle grain boundaries, and between the fraction of high-angle grain boundaries and plastic strain obtainable experimentally, provide new perspectives for grain boundary engineering and network design. Determining the dominant evolution mechanism and critical accumulated strain for a given material and processing route requires further experimental studies of triple junction evolution.
Original language | English |
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Article number | 119290 |
Number of pages | 14 |
Journal | Acta Materialia |
Volume | 259 |
Early online date | 23 Aug 2023 |
DOIs | |
Publication status | Published - 15 Oct 2023 |
Keywords
- Dynamic recrystallisation
- Grain rotations
- Polyhedral cell complexes
- Network invariants
- Triple junctions’ distribution
Research Beacons, Institutes and Platforms
- Advanced materials
- Energy
Fingerprint
Dive into the research topics of 'Topological characteristics of grain boundary networks during severe plastic deformations of copper alloys'. Together they form a unique fingerprint.Projects
- 1 Finished
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Geometric Mechanics of Solids: new analysis of modern engineering materials - GEMS
Jivkov, A. (PI) & Margetts, L. (CoI)
1/11/16 → 31/10/21
Project: Research
Research output
- 14 Article
-
Defect-induced fracture topologies in Al2O3 ceramic-graphene nanocomposites
Borodin, E., Sheinerman, A., Bushuev, O., Gutkin, M. Y. & Jivkov, A., 1 Mar 2024, In: Materials & Design. 239, 18 p., 112783.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Discrete model for discontinuous dynamic recrystallisation applied to grain structure evolution inside adiabatic shear bands
Borodin, E., Bushuev, O., Bratov, V. & Jivkov, A., 1 May 2024, In: Journal of Materials Research and Technology. 30, p. 2125-2139 15 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile58 Downloads (Pure) -
Discrete modelling of continuous dynamic recrystallisation by modified Metropolis algorithm
Zhu, S., Borodin, E. & Jivkov, A., 1 Feb 2024, In: Computational Materials Science. 234, 11 p., 112804.Research output: Contribution to journal › Article › peer-review
Open AccessFile85 Downloads (Pure)