Institute of Material and Process Design, Helmholtz-Zentrum Hereon, Geesthacht, Germany.
Department of Magnesium, Korea Institute of Materials Science, Changwon, Republic of Korea.
J Synchrotron Radiat. 2023 Jul 1;30(Pt 4):739-745. doi: 10.1107/S1600577523003491. Epub 2023 May 11.
An understanding of deformation behavior and texture development is crucial for the formability improvement of Mg alloys. X-ray line profile analysis using the convolutional multiple whole profile (CMWP) fitting method allows the experimental determination of dislocation densities separately for different Burgers vectors up to a high deformation degree. A wider use of this technique still requires exploration and testing of various materials. In this regard, the reliability of the CMWP fitting method for Mg-Zn-Y alloys, in terms of the dislocation activity during tensile deformation, was verified in the present study by the combined analysis of electron backscatter diffraction (EBSD) investigation and visco-plastic self-consistent (VPSC) simulation. The predominant activity of non-basal 〈a〉 dislocation slip was revealed by CMWP analysis, and Schmid factor analysis from the EBSD results supported the higher potential of non-basal dislocation slip in comparison with basal 〈a〉 dislocation slip. Moreover, the relative slip activities obtained by the VPSC simulation also show a similar trend to those obtained from the CMWP evaluation.
了解变形行为和织构发展对于提高镁合金的成形性至关重要。使用卷积多整体轮廓（CMWP）拟合方法的 X 射线线轮廓分析允许在高变形程度下分别实验确定不同柏氏矢量的位错密度。为了更广泛地应用该技术，仍然需要对各种材料进行探索和测试。在这方面，通过电子背散射衍射（EBSD）研究和粘塑性自洽（VPSC）模拟的组合分析，本研究验证了 CMWP 拟合方法在 Mg-Zn-Y 合金中的可靠性，以及在拉伸变形过程中位错活动的可靠性。CMWP 分析揭示了非基面〈a〉位错滑移的主要活性，而 EBSD 结果的 Schmid 因子分析则支持非基面位错滑移相对于基面〈a〉位错滑移具有更高的潜力。此外，通过 VPSC 模拟获得的相对滑移活性也表现出与 CMWP 评估相似的趋势。
