Origin of texture development in orthorhombic uranium

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:665

Article

Zecevic, Miroslav¹  Knezevic, Marko¹  Beyerlein, Irene J.²  McCabe, Rodney J.³ 

[1] Univ New Hampshire, Dept Mech Engn, Durham, NH 03824 USA

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[3] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

关键词: Orthorhombic structure;    Uranium;    Texture;    Rolling;    Crystal plasticity;   

DOI  :  10.1016/j.msea.2016.04.018

来源: Elsevier

【 摘 要 】

We study texture evolution of alpha-uranium (alpha-U) during plane strain compression and uniaxial compression to high strains at different temperatures. We combine a multiscale polycrystal constitutive model and detailed analysis of texture data to uncover the slip and twinning modes responsible for the formation of individual texture components. The analysis indicates that during plane strain compression, floor slip (001)[100] results in the formation of two pronounced {001} texture peaks tilted 10-15 degrees away from the normal toward the rolling direction. During both high-temperature (573 K) through-thickness compression and plane strain compression, the active slip modes are floor slip (001)[100] and chimney slip 1/2{110}< 1 (1) over bar0 > with slightly different ratios. {130}< 3 (1) over bar0 > deformation twinning is profuse during rolling and in-plane compression and decreases with increasing temperature, but is not as active for through-thickness compression. Finally, we comment on some similarities between rolling textures of cc U, which has a c/a ratio of 1.734, and those that develop in hexagonal close packed metals with similarly high c/a ratios like Zn (1.856) and Cd (1.885) and are dominated by basal slip. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free