Unveiling the twinning and dynamic recrystallization behavior and the resultant texture evolution in the extruded Mg-Bi binary alloys during hot compression

doi:10.1016/j.jmst.2021.06.077

Abstract

Abstract:

The twinning behavior, dynamic recrystallization (DRX) mechanism and the resultant texture evolution of the extruded Mg-xBi (x=0.5 wt.%, 2.0 wt.%) alloys were systematically investigated during hot compression at the strain rate of 10 s^-1 and temperature of 200°C. The results indicate that the types and intensities of the texture are greatly dependent on the twining behavior and DRX mechanism. At the initial stage, the evolution of texture is mainly domination by the formation and variation of { $10\bar{1}2$} extension twins, which is beneficial to the compression direction (CD) -tilted basal texture. With an increase in the strain, the texture evolution is more greatly regulated by the DRX mechanism. Besides, the pyramidal <c + a> slip and basal <a> slip are activated during the compression process, resulting in the Schmid factors (SF) of pyramidal slip remain at ∼0.4 and the average SFs for basal <a> slip increase from 0.2 to 0.34 as the strain increase. These findings provide a new insight into controlling the texture of wrought Mg-Bi-based alloys during hot deformation processing.

Key words: Wrought Mg-Bi alloys, Hot deformation, Twinning, Dynamic recrystallization, Dislocation slip, Texture

Yu-qin Zhang, Wei-li Cheng, Hui Yu, Hong-xia Wang, Xiao-feng Niu, Li-fei Wang, Hang Li. Unveiling the twinning and dynamic recrystallization behavior and the resultant texture evolution in the extruded Mg-Bi binary alloys during hot compression[J]. J. Mater. Sci. Technol., 2022, 105: 274-285.

Figures/Tables 14

Table 1. The condition investigated for the Mg-0.5Bi and M-2.0Bi alloys compressed at different strains.

Sample code	Sample condition	Sample code	Sample condition
B0	Mg-0.5Bi	B2	Mg-2.0Bi
B0-HC0.075	Mg-0.5Bi alloy compressed at a true strain of 0.075	B2-HC0.075	Mg-2.0Bi alloy compressed at a true strain of 0.075
B0-HC0.15	Mg-0.5Bi alloy compressed at a true strain of 0.15	B2-HC0.15	Mg-2.0Bi alloy compressed at a true strain of 0.15
B0-HC0.30	Mg-0.5Bi alloy compressed at a true strain of 0.30	B2-HC0.30	Mg-2.0Bi alloy compressed at a true strain of 0.30

Fig. 1. Microstructure and texture of the extruded (a-d) B0 and (e-h) B2 alloys: (a, e) inverse pole figure map, (b, f) average grain size, (c, g) (0001) pole figures and (d, h) ED inverse pole figures.

Fig. 2. The distribution, morphology and microstructure of the second phase in extruded Mg-Bi alloys: SEM images of (a) B0 alloy, (b) B2 alloy, (c) XRD patterns of extruded B0 and B2 alloys, (d) TEM and (e) SAED pattern of the second phase.

Fig. 3. (a) True stress-strain curve of extruded B0 and B2 alloys compressed at 200°C with strain rate of 10 s-1. (b) The corresponding strain-hardening rate curve.

Fig. 4. Texture development during compression at different strains: (a, e, i) (0001) pole figures of B0 alloy: (a) 0.075, (e) 0.15, (i) 0.30; (b, f, i) inverse pole figures of B0 alloy: (b) 0.075, (f) 0.15, (i) 0.30; (c, j, k) (0001) pole figures of Mg-2.0Bi alloy: (c) 0.075, (j) 0.15, (k) 0.30 and (d, h, l) inverse pole figures of Mg-2B alloy: (d) 0.075, (h) 0.15, (l) 0.30.

Fig. 5. TEM images of dynamic precipitates in (a, b) B0 and (c, d) B2 at strains of 0.15 and 0.30.

Table 2. Volume fraction of different twins types and DRX and the average grain size at the different strains of B0 and B2 alloys.

Turestrain	ETW (%)		CTW (%)		DTW (%)		DRX (%)		Grain Size (μm)
Turestrain	Mg-0.5Bi	Mg-2.0Bi	Mg-0.5Bi	Mg-2.0Bi	Mg-0.5Bi	Mg-2.0Bi	Mg-0.5Bi	Mg-2.0Bi	Mg-0.5Bi	Mg-2.0Bi
0.075	20.7	18.8	0.0417	0.0448	0.0527	0.0138	8.9	13.4	6.02	5.23
0.15	4.29	3.32	0.612	0.392	0.911	1.13	11.6	10.5	5.94	5.68
0.30	2.15	1.78	0.784	0.339	1.09	1.35	15.4	13.1	5.43	5.83

Fig. 6. The twining behavior of B0-HC0.075 and B2-HC0.075 alloys: (a, b) inverse pole figure map, (c, d) corresponding boundary misorientation map, (e, f) misorientation angle distribution map and corresponding axis distribution, (g, h) (0001) pole figure of {10-12} extension twin.

Fig. 7. The DRX of B0-HC0.30 and B2-HC0.30 alloys from EBSD: (a, b) inverse pole figure map, (c, d) DRXed grain regions, (e, f) misorientation angle distribution map and corresponding axis distribution, (g, h) (0001) pole figure of DRXed and unDRXed regions.

Fig. 8. The variants of { $10\bar{1}2$} extension twin and the corresponding effect on texture evolution of parent grains for B0-HC0.075 and B2-HC0.075 alloys: inverse pole figures: (a, b) B0 alloy and (c, d) B2 alloy, (0001) pole figures: (e, f) B0 alloy and (g, h) B2 alloy.

Fig. 9. Effect of CDRX mechanism on the texture evolution in selected region R1 and R2 in Fig. 5(a) and (b): B0 alloy: (a) IPF map, (b) corresponding (0001) pole figure, (c) line profiles of misorientation angles along the arrow AB, B2 alloy: (d) IPF map, (e) corresponding (0001) pole figure, (f) line profiles of misorientation angles along the arrow AB.

Fig. 10. Effect of DDRX mechanism on the texture evolution in selected region R3 and R4 in Fig. 5(a) and (b): B0 alloy: (a) IPF map, (b) corresponding (0001) pole figure, B2 alloy: (c) IPF map, (d) corresponding (0001) pole figure.

Fig.11. The average SF for basal <a> slip, prismatic <a> slip, pyramidal <a> slip and pyramidal <c + a> slip for as-compressed B0 and B2 alloys with strains of 0, 0.075, 0.15, 030: (a) B0, (b) B2, (c) the kernel average misorientation value of as-compressed B0 and B2 alloys with strains of 0, 0.075, 0.15, 030.

Fig. 12. TEM images of extruded B0 and B2 alloys when compressed to strain of 0.15: (a, b) B0 and (c, d) B2.

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