Influences of the Texture Characteristic and Interdendritic LPSO Phase Distribution on the Tensile Properties of Mg-Gd-Y-Zn-Zr Sheets Through Hot Rolling

doi:10.1007/s40195-021-01189-2

Abstract

Abstract:

The Mg-Gd-Y-Zn-Zr alloy sheets with different texture characteristics and distribution of the interdendritic long period-stacking ordered (LPSO) phases were fabricated through altering the final rolling reduction (FRR). The results showed that the texture characteristic was closely related to FRR and affected the tensile properties of the resulted sheets to some extent. The Schmid factor (SF) of the basal \(\left\langle a \right\rangle\) slip improved with further FRR, which was ascribed to that the dynamic recrystallization (DRX) grains expand into the deformed grains with basal texture. However, the improvement of the tensile yield strength (TYS) with further FRR indicates that the strengthening effect from DRX grains surpasses the weakening effect from the elevated SF. The formation of the line-distributed interdendritic 14H-LPSO phases can also affect the tensile properties of the resulted sheets. The line-distributed interdendritic 14H-LPSO phases along rolling direction (RD) can act as reinforcing fiber and contribute to the higher TYS along RD and 45° to some extent, which resulted in the higher TYS along 45° compared with that along transverse direction (TD) for each resulted sheet under the circumstance of approximate basal \(\left\langle a \right\rangle\) and pyramid \(\left\langle {c + a} \right\rangle\) friction stress. Thus, the tensile yield strength is not only related to the texture, but also depends on the grain size and line-distributed interdendritic LPSO phases. The micro-cracks spread perpendicular to the tension direction, and thus, the larger cracks form within the line-distributed 14H-LPSO phases during tension along TD, which accounts for the lower fracture elongation along TD.

Key words: Final rolling reduction, Texture characteristic, Interdendritic 14H-LPSO phases distribution, Tensile property

Bing Li, Ji Wu, Bugang Teng. Influences of the Texture Characteristic and Interdendritic LPSO Phase Distribution on the Tensile Properties of Mg-Gd-Y-Zn-Zr Sheets Through Hot Rolling[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(8): 1051-1064.

Figures/Tables 17

Table 1 Thickness variation during the multi-pass hot rolling (the resulted sheets with FRR of 40%, 50% and 60% were denoted as R40, R50 and R60, respectively)

Pass	Rolling reduction (mm)	Thickness change (%)	Temperature (°C)
1	25-17.3	30.8	450
2	17.3-12	30.6	450
3	12-8.5	29.1	450
4	8.5-5.8	31.7	450
5	5.8-4.1	29.3	450
6
R40	4.1-2.44	40.5	450
R50	4.1-2.08	49.3	450
R60	4.1-1.59	61.2	450

Fig. 1 Schematic diagram of the tensile sample extraction

Fig. 2 SEM images and the interdendritic 14H-LPSO phases distribution of the resulted sheets: a-c R40, d-f R50, g-i R60

Fig. 3 IPF maps of the resulted sheets with different FRRs: a R40, b R50, c R60 and grain size distribution of resulted sheets: d R40, e R50, f R60

Fig. 4 (0001) (10-10)(11-20) pole figures of total grains and basal (0001) pole figure of deformed grains and DRX grains of resulted sheets

Fig. 5 Distribution of (0001) pole density of resulted sheets with different FRRs: a RD, b TD, c 45°

Fig. 6 Stress-strain response curves along RD, TD and 45° of resulted sheets: a R40, b R50, c R60

Table 2 Summarized tensile properties of the resulted sheets with different FRRs

Samples	TYS (MPa)			UTS (MPa)			FE (%)
Samples	RD	45°	TD	RD	45°	TD	RD	45°	TD
R40	340 ± 3	276 ± 4	260 ± 2	421 ± 4	379 ± 4	345 ± 3	7.89 ± 0.2	8.51 ± 0.3	5.14 ± 0.2
R50	367 ± 2	321 ± 3	291 ± 3	446 ± 5	412 ± 4	388 ± 5	10.30 ± 0.4	12.12 ± 0.4	8.92 ± 0.3
R60	375 ± 3	316 ± 3	285 ± 3	435 ± 2	417 ± 2	387 ± 3	6.02 ± 0.3	11.34 ± 0.4	5.16 ± 0.2

Fig. 7 Basal \(\left\langle a \right\rangle\) SF distribution maps along RD for resulted sheets: a R40, b R50, c R60 and distribution diagram for resulted sheets: d R40, e R50, f R60

Fig. 8 Basal \(\left\langle a \right\rangle\) SF distribution maps along 45° for resulted sheets: a R40, b R50, c R60 and distribution diagram for resulted sheets: d R40, e R50, f R60

Fig. 9 Basal \(\left\langle a \right\rangle\) SF maps along TD for resulted sheets: a R40, b R50, c R60 and distribution diagram for resulted sheets: d R40, e R50, f R60

Fig. 10 a Variation of TYS and fracture elongation, b correlation of TYS and basal \(\left\langle a \right\rangle\) slip orientation factor (M), c distribution of fracture elongation versus basal \(\left\langle a \right\rangle\) slip orientation factor (M)

Table 3 Average SF/orientation factor (M) of different dislocation slips for resulted sheets

Dislocation slip system	R40			R50			R60
Dislocation slip system	RD	45°	TD	RD	45°	TD	RD	45°	TD
Basal \(\left\langle a \right\rangle\)	0.193/5.18	0.294/3.40	0.281/3.56	0.223/4.48	0.233/4.29	0.233/4.29	0.217/4.61	0.251/3.98	0.267/3.75
Prismatic \(\left\langle a \right\rangle\)	0.410	0.360	0.334	0.409	0.393	0.388	0.410	0.408	0.386
Pyramid \(\left\langle {c + a} \right\rangle\)	0.417	0.400	0.425	0.416	0.411	0.423	0.414	0.422	0.420

Table 4 Calculated shear stress σ0 of different dislocation slips for resulted sheets

Dislocation slip system	R40			R50			R60
Dislocation slip system	RD	45°	TD	RD	45°	TD	RD	45°	TD
Basal \(\left\langle a \right\rangle\)	25.90	17.01	17.79	22.42	21.46	21.46	23.04	19.92	18.72
Prismatic \(\left\langle a \right\rangle\)	58.54	66.67	71.86	58.68	61.07	61.86	58.54	58.82	62.18
Pyramid \(\left\langle {c + a} \right\rangle\)	47.96	50	47.06	48.08	48.66	47.28	48.31	47.39	47.61

Fig. 11 Fracture morphologies during tension along different directions of the resulted sheets: a R40-RD, b R40-45°, c R40-TD, d R50-RD, e R50-45°, f R50-TD, g R60-RD, h R60-45°, i R60-TD

Fig. 12 SEM images of the fracture side of the resulted sheets: a R50 along RD, b R50 along 45°, c R50 along TD, d R60 along RD, e R60 along 45°, f R60 along TD

Fig. 13 Schematic diagram of cracks propagation within the interdendritic 14H-LPSO phases of resulted sheets

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