Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

doi:10.1007/s40195-023-01527-6

Abstract

Abstract:

Alternating extrusion (AFE) is a new way to effectively alter the texture and enhance the mechanical properties of the extruded bars. However, the mechanisms of microstructure evolution and enhancement of hardness are still unknown by different extrusion ratios (ERs) during extrusion. This work systematically investigated the microstructure and hardness of AZ31 alloy with various extrusion ratios of 8.1, 15.6, and 24.8 by electron backscattered diffraction. The most striking result to emerge from the data is that when the ERs were increased from 8.1 to 15.6, the grain size was refined to 7.13 μm. However, when the ER reached 24.8, the average grain size was 11.43 μm. The proportion of recrystallization was only 2.92%, there was a continuous rotation of sub-grains at coarse grain boundaries, and non-basal slip < a > dislocations were activated and enriched near low-angle grain boundaries. At present, the recrystallization has not been completed. The grains of the product are coarsened, and the hardness is reduced. When λ = 15.6, the AFE has a significant grain refinement effect and the highest hardness value.

Key words: Alternate extrusion method, AZ31 magnesium alloy, Extrusion ratio, Grain refinement, Hardness

Ronghe Gao, Feng Li, Huaqiu Du, Pengda Huo. Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(8): 1292-1304.

Figures/Tables 12

Fig. 1 AFE process principle

Table 1 Chemical composition of AZ31 magnesium alloy (wt%)

Al	Zn	Mn	Fe	Si	Cu	Ni	Mg
3.20	0.86	0.36	0.0018	0.021	0.0022	0.00056	Bal.

Fig. 2 At various ERs, grain size distribution and BC images: a, d λ = 8.1; b, e λ = 15.6 and c, f λ = 24.8

Fig. 3 EBSD maps at different ERs: a, b, c λ = 8.1; d, e, f λ = 15.6 and g, h, i λ = 24.8

Fig. 4 Pole figures: a λ = 24.8, b λ = 15.6, and c λ = 8.1

Fig. 5 Hardness of each ER

Fig. 6 SF values for various slip systems under different ERs: a λ = 8.1; b λ = 15.6 and c λ = 24.8

Fig. 7 Sample in the TD-ND plane after extrusion at 350 °C: a λ = 8.1; b and c details of λ = 15.6 and λ = 24.8, respectively; d-i corresponding misorientation profiles measured along lines L1, L2 and L3

Fig. 8 Different grain types of grains: a λ = 8.1; b λ = 15.6; c λ = 24.8

Fig. 9 EBSD results of λ = 24.8: a IPF map, b corresponding boundary misorientation map and c (0001) pole figure, and d inverse pole figure

Fig. 10 UnDRXed grain G2: a inverse pole figure, b (0001) pole figure, c inverse pole figure and d line profile of misorientation angle along the arrows AB

Fig. 11 SF of unDRXed grain as shown in Fig. 9a

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