Microstructure and Mechanical Properties of Mg-3Al-Zn Magnesium Alloy Sheet by Hot Shear Spinning

doi:10.1007/s40195-020-01036-w

Abstract

Abstract:

Hot shear spinning experiments with Mg-3.0Al-1.0Zn-0.5Mn (AZ31B, wt%) magnesium alloy sheets were conducted at various temperatures, spindle speeds and feed ratios to investigate the effects of these processing parameters on the microstructure, crystallographic texture and mechanical properties. The AZ31B sheet displayed good shear formability at temperatures from 473 to 673 K, spindle speeds from 300 to 600 rev/min and feed ratios from 0.1 to 0.5 mm/rev. During the dynamic recrystallization process, the grain size and texture were affected by the deformation temperature of the hot shear spinning process. Each of the spun sheets presented a strong basal texture, and the c-axis of most of the grains was parallel to the normal direction. The optimal hot shear spinning parameters were determined to be a temperature of 473 K, a spindle speed of 300 rev/min and a feed ratio of 0.1 mm/rev. The yield strength, ultimate tensile strength and elongation in the rolled direction reached 221 MPa, 288 MPa and 14.1%, and those in the transverse direction reached 205 MPa, 280 MPa and 12.4%, respectively. The improved strength and decreased mechanical anisotropy resulted from the fine grain size and strong basal texture.

Key words: AZ31B magnesium alloy, Shear spinning, Texture, Grain refinement

Fenghua Wang, Peng Su, Linxin Qin, Shuai Dong, Yunliang Li, Jie Dong. Microstructure and Mechanical Properties of Mg-3Al-Zn Magnesium Alloy Sheet by Hot Shear Spinning[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(9): 1226-1234.

Figures/Tables 16

Fig. 1 a IPF map, b (0001) pole figure, c tensile stress-strain curve of initial AZ31B sheet

Fig. 2 Schematic diagram of tensile samples and EBSD samples in rolled and spun sheets

Fig. 3 IPF maps and (0001) pole figures of annealed AZ31B sheet for 10 min at a, d 473 K, b, e 573 K, c, f 673 K

Fig. 4 Oblique views of AZ31B sheets after hot shear spinning (373 K, 473 K, 573 K and 673 K)

Table 1 Process parameters used in this study

No.	Temperature (K)	Spindle speed (rev/min)	Feed ratio (mm/rev)	Result
1	373	300	0.1	Cracked
2	473	300	0.1	Fine
3	573	300	0.1	Fine
4	673	300	0.1	Fine
5	573	600	0.1	Fine
6	573	300	0.5	Fine

Fig. 5 IPF maps of spun sheets at various temperatures: a 473 K, b 573 K, c 673 K

Fig. 6 Relationship of average grain size with annealed and spinning temperatures

Fig. 7 Tensile stress-strain curves of spun sheets at various temperatures

Table 2 Mechanical properties of spun sheets at various temperatures

No.	YS (RD/TD), MPa	UTS (RD/TD), MPa	Elongation (RD/TD), %
2	221/205	288/280	14.1/12.4
3	186/182	267/271	19.3/17.4
4	143/155	250/247	17.8/17.4

Fig. 8 IPF maps of sheets spun with different parameters: a 600 rev/min, 0.1 mm/rev, b 300 rev/min, 0.5 mm/rev

Fig. 9 Tensile engineering stress-strain curves of spun sheets with different spindle speeds and feed ratios

Table 3 Mechanical properties of spun sheets at different spindle speeds and feed ratios

No.	YS (RD/TD), MPa	UTS (RD/TD), MPa	Elongation (RD/TD), %
5	160/160	245/254	19.5/19.0
6	127/138	241/247	17.7/17.7

Fig. 10 (0001) pole figure of spun sheets: a 473 K, 300 rev/min, 0.1 mm/rev, b 573 K, 300 rev/min, 0.1 mm/rev, c 673 K, 300 rev/min, 0.1 mm/rev, d 573 K, 600 rev/min, 0.1 mm/rev, e 573 K, 300 rev/min, 0.5 mm/rev

Fig. 11 Schematic of stress state in deformation area during shear spinning

Fig. 12 Distributions of Schmid factors of RD samples with different spindle speeds

Table 4 Statistical distribution of Schmid factors of RD samples with different spindle speeds

No.	Fraction of basal slip		Fraction of prismatic slip
No.	< 0.25	> 0.25	< 0.40	> 0.40
3	0.60	0.40	0.23	0.77
5	0.79	0.21	0.11	0.89

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