期刊
ACTA MATERIALIA
卷 164, 期 -, 页码 135-152出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.10.033
关键词
Magnesium alloy; In situ tension test; Neutron diffraction; Plastic deformation; Strain path change
资金
- European Research Council within the ERC Advanced Grant MULTIAX [339245]
- ERC
- Competence Centre for Materials Science and Technology (CCMX)
- Czech Science Foundation [14-36566G]
The mechanical behavior of cold-rolled Mg AZ31B is studied during in-plane multiaxial loading and tension-tension strain path changes performed on cruciform samples using in situ neutron diffraction and EBSD. The results are compared with uniaxial tension loading of dogbone-shaped samples measured with in situ neutron diffraction and acoustic emission. The activity of slip and twinning mechanisms and the active twin variants are discussed for the different strain paths. It is shown that initial strains of 4-5% cause a strengthened yield stress during reload for strain path change angles of 90 and 135 degrees. The strengthening is primarily due to dislocation accumulation during the initial load impeding dislocation motion during the reload. The twinning observed during the prestrain activates complex multivariant secondary twinning which may also contribute to the strengthening in the reload. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd.
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