Experimental and numerical investigation of anisotropic and twinning behavior in Mg alloy under uniaxial tension. (15th May 2016)

• Record Type: Journal Article
• Authors: Guo, Xiaoqian; Chapuis, Adrien; Wu, Peidong; Liu, Qing; Mao, Xianbiao
• Is Part Of: Materials & design. Volume 98(2016)
• Page Start: 333
• Page End: 343
• Publication Date: 2016-05-15
• Subjects: Magnesium alloy -- AZ31 -- Twinning -- Crystal plasticity -- EVPSC; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.03.045
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: In plane tension of magnesium alloy sheets is accommodated by prismatic and basal slip, whereas {10 − 12} twinning is activated when grains are elongated along the < c > axis. The plastic behavior of Mg-3Al-1Zn in tension has been investigated using a thick rolled plate with a strong basal texture. Tensile tests were performed along five directions distributed between the normal direction and the transverse direction, allowing various amount of {10–12} twinning, basal, and prismatic slip to take place. The twinning behavior has been investigated using EBSD measurement and EVPSC modeling, and Schmid factor analysis was performed. The observed amount of variants with a Schmid factor of high rank is higher than predicted, emphasizing the necessity of strain accommodation between grains and twins. Compared with compression, even when twinning activity is low, more {10–12} twin variants are predicted in tension. This study confirms extension twinning as a major deformation mechanism in all tensile directions and an efficient way to harden Mg alloys by twin-twin boundaries. Graphical abstract: Highlights: EVPSC-TDT simulations of the mechanical behavior in ND-TD plane of a magnesium alloy AZ31 thick rolled plate in tension {10–12} twinning is activated and investigated in tension along different directions. {10–11} twinning is also included in the EVPSC-TDT model for the first time. More {10–12} twin variants of low Schmid factor are observed than predicted. More {10–12} variants are predicted in tension than in compression.