Microstructure and Texture Evolution During the Direct Extrusion and Bending-Shear Deformation of AZ31 Magnesium Alloy

doi:10.1007/s40195-018-0848-8

Abstract

Abstract:

AZ31 alloys were extruded by direct extrusion and bending-shear deformation (DEBS). The microstructure characteristic and texture evolution of DEBSed AZ31 sheets were investigated by electron backscattered diffraction (EBSD). It is found that DEBS technique could effectively refine grains and weaken texture. Besides, we also investigate how twinning affects dynamic recrystallization during hot extrusion. {10-12} extension twins can offer nucleation sites and enough energy to trigger dynamic recrystallization. Moreover, the character of direct extrusion and bending-shear die can lead to the activation of non-basal slip system and further dramatically weaken the basal texture of the microstructure with many pre-activated basal slip systems.

Key words: Magnesium, alloys, Extrusion, Grain, refinement, Texture, evolution

Xiao-Ye Liu, Li-Wei Lu, Kun Sheng, Tao Zhou. Microstructure and Texture Evolution During the Direct Extrusion and Bending-Shear Deformation of AZ31 Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(6): 710-718.

Figures/Tables 9

Fig. 1 a Schematic of the DEBS die, b EBSD observation areas

Fig. 2 EBSD maps of upsetting zone: a IPF figure, b image quality map with twin boundaries, c IPF map of region 1, d Schmid factor map of basal slip system of region 1, e strain distribution diagram of region 1

Table 1 Different types of twin and its misorientation angle and axis

Types of twins	Misorientation angle/axis
{10-12} extension twin	86° <1-210> ±?5°
{10-11} contraction twin	56° <1-210> ±?5°
{10-11}-{10-12} secondary twin	38° <1-210> ±?5°

Table 2 Schmidt factor of the selected grains

Grain number	a	b	c	d	e
Schmidt factor	0.13	0.41	0.44	0.2	0.4

Fig. 3 EBSD maps of conical zone: a IPF figure, b image quality map with twin boundaries; c dynamic recrystallization distribution, d crystallographic map and recrystallization color diagram: deformed grains are in red, sub-structured grains and recrystallized grains, e enlarged map of region 2 and grain orientation three-dimensional diagram

Fig. 4 EBSD maps of transition zone: a IPF figure, b image quality; map with twin boundaries, c misorientation distribution of the AZ31 alloy

Fig. 5 EBSD maps of bending-shear zone: a IPF figure, b dynamic recrystallization distribution, c misorientation distribution

Fig. 6 EBSD maps of forming zone: a IPF figure, b misorientation distribution of the AZ31 alloys, c enlarged map of regions 3 and 4, d pole figure of regions 3 and 4

Fig. 7 {0002} pole figure of forming zone

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