Plastic anisotropy calculation of severely-deformed Al-Mg-Si alloy considering texture changes in electron backscatter diffraction

doi:10.1016/j.jmst.2019.03.022

Abstract

Abstract:

The investigation studied the plastic anisotropy of the severely-deformed Al-Mg-Si alloy by considering texture changes. The sample deformed via asymmetrical rolling under cross-shear condition was annealed at 598 K where recrystallization was in progress. It is found upon annealing that the intensity of Cube ({001}〈100〉) was comparable to those of plane-strain components while the intensities of shear components remained constant despite their instabilities in the recrystallization regime. After annealing, the average Lankford value ($\bar{r}$) of the present sample was close to a unity whereas the in-plane anisotropy (Δr) decreased, resulting in nearly isotropic characteristics of Al-Mg-Si alloy.

Key words: Al-Mg-Si alloy, Anisotropy, Recrystallization, Microstructures

I Putu Widiantara, Hae Woong Yang, Min Jun Kim, Young Gun Ko. Plastic anisotropy calculation of severely-deformed Al-Mg-Si alloy considering texture changes in electron backscatter diffraction[J]. J. Mater. Sci. Technol., 2019, 35(7): 1439-1443.

Figures/Tables 4

Fig. 1. (a) EBSD-IPF map taken from the center of the normal direction (ND)-rolling direction (RD) plane of CS sample. Rolling direction is left to right. (b) EBSD-ODF in the reduced Euler space (?1:0-90°, Φ:0-90°) for ?2=0°, ?2=45°, and ?2=65°.

Fig. 2. (a) EBSD-IPF map taken from the center of the normal direction (ND)-rolling direction (RD) plane of CSA sample. (b) EBSD-ODF in the reduced Euler space (?1:0-90°, Φ:0-90°) for ?2=0°, ?2=45°, and ?2=65°.

Fig. 3. Schematic illustration showing the bulk polycrystalline sample and its FCC unit cells with one of its slip systems. The unit vectors necessary to calculate the r values were shown.

Fig. 4. (a) Intensity values of texture components in CS and CSA samples. An inset indicates the principle to calculate the anisotropy from the texture components. (b) Change in r values in CS and CSA samples.

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