Dual Strengthened Control of Recrystallization Behavior on CVCDE Magnesium Alloy Containing Characteristic Structure

doi:10.1007/s40195-023-01594-9

Abstract

Abstract:

Various characteristic structures in typical magnesium alloys, including dislocation cells, substructures and twins, have an important influence on the dynamic recrystallization behavior, and the DRX (dynamic recrystallization) behavior is closely related to the grain refinement and texture weakening of the hot deformed structure. Therefore, this study reveals the influence of the above characteristic structures on the dynamic recrystallization behavior of magnesium alloys, which have great significance for regulating the high-performance hot deformed microstructure of magnesium alloys and optimizing the macro mechanical properties. In this study, continuous variable channel direct extrusion (CVCDE) magnesium alloy was prepared by CVCDE, and its macro mechanical properties including hardness and uniaxial tension were characterized. The thermoplastic deformation behavior and texture evolution of magnesium alloy with characteristic structure were analyzed by electron back-scattering diffraction technology. It is found that the dislocation recombination was realized by deformation mechanism (slip, climb and cross slip), the formation of grain substructure in coarse grains and the induction of recrystallization by twins promote the recrystallization behavior in hot deformed structures more adequate, which effectively improves the degree of microstructure refinement and deformation uniformity.

Key words: Characteristic structure, Continuous variable channel direct extrusion (CVCDE), Dynamic recrystallization, Regulation, Mechanical property

Nan Bian, Feng Li, Wentao Niu, Chao Li, Yuanqi Li. Dual Strengthened Control of Recrystallization Behavior on CVCDE Magnesium Alloy Containing Characteristic Structure[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(11): 1805-1821.

Figures/Tables 14

Fig. 1 Schematic diagram of CVCDE process

Fig. 2 Different interim and die structure of the CVCDE process

Fig. 3 Microhardness distributions of AZ31 magnesium alloy sheet under different process conditions along ED and TD direction

Fig. 4 Microhardness distributions of the billet in the interim with 2-CVCDE process

Fig. 5 Stress-strain curves of AZ31 magnesium alloy sheets under different processing conditions

Fig. 6 Grain size versus Z parameter of CVCDE AZ31 magnesium alloy

Fig. 7 IPF maps a-c and grain size distribution histograms d-f of AZ31 magnesium processed by different conditions

Fig. 8 Grain boundary characteristics a-c and misorientation angle distributions d-f of AZ31 magnesium processed by different conditions

Fig. 9 KAM maps of AZ31 magnesium processed by different conditions: a CE; b 1-CVCDE; c 2-CVCDE

Fig. 10 Dynamic recrystallization analysis of the CE AZ31 magnesium alloy region R1: a misorientation; b grains orientation; c three-dimensional crystallographic relationship

Fig. 11 Dynamic recrystallization analysis of the CE AZ31 magnesium alloy region R2: a misorientation and grains orientation; b (0001) pole figure

Fig. 12 Dynamic recrystallization analysis of the 1-CVCDE AZ31 magnesium alloy region R2: a grains and sub-grains orientation; b misorientation; c three-dimensional crystallographic relationship; d (0001) pole figure

Fig. 13 Dynamic recrystallization analysis of the 2-CVCDE AZ31 magnesium alloy region R3: a grains orientation; b misorientation; c three-dimensional crystallographic relationship; d (0001) pole figure

Fig. 14 Dynamic recrystallization analysis of the 2-CVCDE AZ31 magnesium alloy region R4: a grains orientation; b misorientation; c (0001) pole figure; d three-dimensional crystallographic relationship

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