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Materials 2018, 11(2), 200; https://doi.org/10.3390/ma11020200

Investigation of the Microstructure Evolution and Deformation Mechanisms of a Mg-Zn-Zr-RE Twin-Roll-Cast Magnesium Sheet by In-Situ Experimental Techniques

1
Department of Physics of Materials, Charles University, Ke Karlovu 5, 12116 Prague 2, Czech Republic
2
Nuclear Physics Institute of the CAS, 250 68 Řež, Czech Republic
3
School of Materials Science and Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 136-702, Korea
4
Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Korea
5
Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology—NTNU, 7491 Trondheim, Norway
6
Institute of Advanced Technologies, Togliatti State University, 445020 Togliatti, Russia
*
Author to whom correspondence should be addressed.
Received: 2 January 2018 / Revised: 25 January 2018 / Accepted: 26 January 2018 / Published: 27 January 2018
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Abstract

Twin roll casting (TRC), with a relatively fast solidification rate, is an excellent production method with promising potential for producing wrought semi or final Mg alloy products that can often suffer from poor formability. We investigate in this study the effect of the TRC method and the subsequent heat treatment on the microstructure and deformation mechanisms in Mg-Zn-Zr-Nd alloy deformed at room temperature using the in-situ neutron diffraction and acoustic emission techniques and ex-situ texture measurement and microscopy, respectively. Although a higher work hardening is observed in the rolling direction due to the more intensive <a>-type dislocation activity, the difference in the mechanical properties of the specimens deformed in the RD and TD directions is small in the as-rolled condition. An additional heat treatment results in recrystallization and significant anisotropy in the deformation. Due to the easier activation of the extension twinning in the TD given by texture, the yield stress in the TD is approximately 40% lower than that in the RD. View Full-Text
Keywords: magnesium; twin roll casting; neutron diffraction; acoustic emission; twinning; yield strength magnesium; twin roll casting; neutron diffraction; acoustic emission; twinning; yield strength
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Máthis, K.; Horváth, K.; Farkas, G.; Choe, H.; Shin, K.S.; Vinogradov, A. Investigation of the Microstructure Evolution and Deformation Mechanisms of a Mg-Zn-Zr-RE Twin-Roll-Cast Magnesium Sheet by In-Situ Experimental Techniques. Materials 2018, 11, 200.

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