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

0488755 - ÚJF 2019 RIV CH eng J - Journal Article
Máthis, K. - Fekete-Horváth, Klaudia - Farkas, Gergely - 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. Roč. 11, č. 2 (2018), č. článku 200. E-ISSN 1996-1944
R&D Projects: GA ČR GB14-36566G; GA MŠMT EF16_013/0001794
Institutional support: RVO:61389005
Keywords : magnesium * twin roll casting * neutron diffraction * acoustic emission * twinning * yield strength
OECD category: Audio engineering, reliability analysis
Impact factor: 2.972, year: 2018

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.
Permanent Link: http://hdl.handle.net/11104/0283292