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A Model of Grain Fragmentation Based on Lattice Curvature by László S. Tóth; Yuri Estrin; Rimma Lapovok; Chengfan Gu is a Engineering article available to read on EtoBox.

What is A Model of Grain Fragmentation Based on Lattice Curvature about?

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

Who reads A Model of Grain Fragmentation Based on Lattice Curvature?

Author

László S. Tóth; Yuri Estrin; Rimma Lapovok; Chengfan Gu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1359-6454)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)