Influence of Continuous Bending Process on Texture Evolution and Mechanical Properties of AZ31 Magnesium Alloy

doi:10.1007/s40195-017-0671-7

Abstract

Abstract:

Mg-3Al-1Zn alloy sheets have been deformed by continuous bending (CB) to investigate the effects of processing parameters (bending angle and repetitive passes) on the texture and formability. The samples exhibited a bimodal microstructure with abnormal growth grains in the surface region and fine grains distributed in the center after CB process followed by annealing. The texture evolution measured by XRD indicated that the basal poles were rotated from ND toward RD, and the texture intensity decreased with the bending angle decreasing and repetitive passes increasing. Compared with the as-received sample, the yield strength of CBA-120-2 sample significantly decreased from 183 to 112 MPa, and a smaller r-value and a larger n-value were obtained. The formability of CB processed samples in annealing condition was significantly enhanced with the highest of Erichsen value of 5.4 mm, increased by about 135%. The improvement of formability was likely attributed to the weakened and RD-tilt basal texture and coarse grains in the surface part.

Key words: Magnesium alloy, Continuous bending, Microstructure, Texture Stretch formability

Ting-Zhuang Han, Guang-Sheng Huang, Lun Huang, Bin Jiang, Guan-Gang Wang, Ai-Tao Tang, Fu-Sheng Pan. Influence of Continuous Bending Process on Texture Evolution and Mechanical Properties of AZ31 Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(3): 225-233.

Figures/Tables 10

Fig. 1 Schematic diagram of a continuous bending device

Fig. 2 a Optical microstructure, b (0002) pole figure of as-received sample

Fig. 3 Microstructures of sheets in different regions. a I region, b II region, c III region during CB-120-1 process

Fig. 4 Microstructures of a CBA-140-1, b CBA-120-1, c CBA-120-2 samples

Fig. 5 The (0002) pole figures of a CBA-140-1, b CBA-120-1, c CBA-120-2 samples

Fig. 6 True stress-strain curves of different samples

Table 1 Mechanical properties of various samples

Samples	YS (MPa)			UTS (MPa)			FE (%)
Samples	RD	45°	TD	RD	45°	TD	FE (%)
AS	183 ± 2	200 ± 3	216 ± 1	334 ± 5	323 ± 7	330 ± 10	16.5 ± 0.5
CBA-140-1	140 ± 1	165 ± 2	196 ± 1	328 ± 5	321 ± 8	336 ± 7	18.2 ± 0.5
CBA-120-1	127 ± 2	157 ± 1	191 ± 3	315 ± 6	303 ± 5	331 ± 7	17.8 ± 0.5
CBA-120-2	112 ± 1	151 ± 1	186 ± 2	311 ± 4	307 ± 3	313 ± 6	19.2 ± 0.5

Fig. 7 Lankford values (r-value) and strain hardening exponent values (n-value) of various samples

Fig. 8 Average values of IE of various samples

Fig. 9 SEM images of the tensile fracture surface of a AS, b CBA-140-1, c CBA-120-1, d CBA-120-2 samples

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