Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 670, Issue -, Pages 64-71Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.02.023
Keywords
Friction stir welding; Magnesium alloy; Welding parameters; Texture; Twinning
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Funding
- National Natural Science Foundation of China [51571045, 51421001]
- National Basic Research Program of China [2013CB632204]
- Fundamental Research Funds for the Central Universities [106112015CDJXZ138801, 106112013CDJZR13130032]
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Friction stir welding (FSW) has promising application potential for Mg alloys. However, softening was frequently occurred in FSW Mg joints because of the presence of a beta-type fiber texture. The present study aims to understand the influence of texture distribution in stir zone (SZ) on deformation behavior and joint strength of FSW Mg welds. AZ31 Mg alloy joints were obtained by FSW with two sets of welding speed and rotation rate. Detailed microstructure and texture evolutions were examined on Mg welds by electron backscatter diffraction (EBSD) techniques. It was found that the changes of welding parameters can affect texture distribution and the characteristic of texture in the transition region between SZ and thermal-mechanical affected zone (TMAZ). As a consequence, the activation ability of basal slip and extension twinning was changed, which therefore influenced joint strength, inhomogeneous plastic deformation and fracture behaviors. The present work provided some insights into understanding the textureeproperty relationship in FSW Mg welds and indicated that it is effective to tailor the joint performance by texture control. (C) 2016 Elsevier B.V. All rights reserved.
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