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A model of grain fragmentation based on lattice curvature

Tóth, Laszlo S, Estrin, Yuri, Lapovok, Rimma and Gu, Chengfan 2010, A model of grain fragmentation based on lattice curvature, Acta materialia, vol. 58, no. 5, pp. 1782-1794, doi: 10.1016/j.actamat.2009.11.020.

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Title A model of grain fragmentation based on lattice curvature
Author(s) Tóth, Laszlo S
Estrin, Yuri
Lapovok, Rimma
Gu, Chengfan
Journal name Acta materialia
Volume number 58
Issue number 5
Start page 1782
End page 1794
Total pages 13
Publisher Elsevier
Place of publication Oxford, Eng.
Publication date 2010-03
ISSN 1359-6454
Summary A new model is proposed that aims to capture within a single modelling frame all the main microstructural features of a severe plastic deformation process. These are: evolution of the grain size distribution, misorientation distribution, crystallographic texture and the strain-hardening of the material. The model is based on the lattice curvature that develops in all deformed grains. The basic assumption is that lattice rotation within an individual grain is impeded near the grain boundaries by the constraining effects of the neighbouring grains, which gives rise to lattice curvature. On that basis, a fragmentation scheme is developed which is integrated in the Taylor viscoplastic polycrystal model. Dislocation density evolution is traced for each grain, which includes the contribution of geometrically necessary dislocations associated with lattice curvature. The model is applied to equal-channel angular pressing. The role of texture development is shown to be an important element in the grain fragmentation process. Results of this modelling give fairly precise predictions of grain size and grain misorientation distribution. The crystallographic textures are well reproduced and the strength of the material is also reliably predicted based on the modelling of dislocation density evolution coupled with texture development.
Language eng
DOI 10.1016/j.actamat.2009.11.020
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2009, Acta Materialia
Persistent URL http://hdl.handle.net/10536/DRO/DU:30076002

Document type: Journal Article
Collection: Institute for Frontier Materials
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