The origin of discontinuous yielding in Mg alloys under slip-dominated condition studied by in-situ synchrotron diffraction and elastic-viscoplastic self-consistent modeling
| Autor: | Cheng-Yan Xu, Xiao Guang Qiao, Xiaohua Zhou, H.-G. Brokmeier, Y.Q. Chi, D.L. Sun, Mingyi Zheng |
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| Rok vydání: | 2019 |
| Předmět: |
In situ
Materials science Alloy Thermodynamics 02 engineering and technology Slip (materials science) engineering.material 01 natural sciences 0103 physical sciences Synchrotron diffraction Stress relaxation ddc:530 General Materials Science 010302 applied physics Viscoplasticity Mechanical Engineering technology industry and agriculture equipment and supplies 021001 nanoscience & nanotechnology Condensed Matter Physics Deformation mechanism Mechanics of Materials engineering Extrusion 0210 nano-technology |
| Zdroj: | Materials science and engineering / A 754, 562-568 (2019). doi:10.1016/j.msea.2019.03.073 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2019.03.073 |
| Popis: | Materials science and engineering / A 754, 562 - 568 (2019). doi:10.1016/j.msea.2019.03.073 A discontinuous yielding was observed in the as-extruded Mg-7Gd-2Y-1Zn-0.6Zr (wt. %) alloy under uniaxial tension along the extrusion direction, which was eliminated by the peak-aging treatment. The deformation mechanisms of the as-extruded and peak-aged alloys were studied by in-situ synchrotron diffraction measurement and elastic-viscoplastic self-consistent (EVPSC) modeling. The in-situ synchrotron diffraction results suggest that the unpinning of basal dislocations from solute atmospheres causes the stress relaxation in the basal slip favored grains. The EVPSC modeling results indicate that the discontinuous yielding in the as-extruded alloy is associated with the interaction between basal dislocations and solute atmospheres. After peak-aging treatment, the interaction between basal dislocations and solute atmospheres is weakened due to the consumption of a number of solute atoms. Consequently, the discontinuous yielding is eliminated in the peak-aged alloy. Published by Elsevier, Amsterdam |
| Databáze: | OpenAIRE |
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