Dynamic recrystallization of a wrought magnesium alloy: Grain size and texture maps and their application for mechanical behavior predictions. (April 2021)

• Record Type: Journal Article
• Authors: Li, Yuan; Hou, Peijun; Wu, Zhenggang; Feng, Zhili; Ren, Yang; Choo, Hahn
• Is Part Of: Materials & design. Volume 202(2021)
• Publication Date: 2021-04
• Subjects: Dynamic recrystallization -- Grain refinement -- Texture modification -- Hall Petch relationship -- Magnesium alloy; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2021.109562
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Effect of dynamic recrystallization (DRX) on the grain refinement and texture modification was studied by conducting a series of hot compression on AZ31B Mg alloy. Processing-grain size-texture maps were established as a function of temperature, strain rate, strain, and the Zener-Hollomon parameter (Z). Moreover, influence of simultaneous changes in the grain size and texture on tensile yield strength and ductility of the hot-worked Mg alloy was studied using the grain size and texture maps established. The processing-grain size map showed that the DRX grain size decreased with the increase in Z, also revealing various characteristics ranging from a grain growth, grain refinement, to a bimodal distribution of ultrafine grains and partially recrystallized grains. The effect of twinning on the grain refinement was also evident at high Z conditions. The processing-texture map revealed that the initial fiber texture was altered significantly to a shear, off-normal, or extension-twin texture with the increase in Z. The Schmid-factor maps were calculated to identify a dominant deformation mode during a subsequent tensile deformation of the hot-worked samples. Finally, a corresponding Hall-Petch relationship for each dominant deformation mode was used to establish tensile yield-strength maps, which agree well with the measured data. Graphical abstract: Unlabelled Image Highlights: Processing-grain size-texture maps were established as a function of hot-working conditions for AZ31B Mg alloy. The grain size map showed that the recrystallized grain size decreased with the increase in Zener-Hollomon parameter. The processing-texture map showed that the initial texture was altered significantly during the recrystallization process. The Schmid-factor map was established to identify a dominant deformation mode during a subsequent deformation. Yield-strength maps of the Mg alloy, hot worked at a wide range of temperatures and strain rates, were predicted.