Study of Dislocation Boundary Structure in Al-Li Alloy During Bending

doi:10.1007/s40195-015-0306-9

Abstract

Abstract:

The dislocation boundary structures of 2060-T8 alloy during bending were investigated by backscattered electron imaging, electron backscattered diffraction, and misorientation axes maps. Experimental result shows that typical dislocation boundary structures, which depend on grains’ orientation, are formed in grains during bending. The microstructure of type A is mainly observed in grains near brass, copper, and Goss orientations; microstructure of type B is mainly found in grains near S orientation; microstructure of type C is mainly seen in grains near Cube orientation. The angle between geometrically necessary boundaries (GNBs) and force axis is in the range of -45° to -30° and 30° to 45°. Most of the GNBs are approximately parallel to the trace of {111} slip planes which are identified by Schmid factor analysis.

Key words: Al-Li alloy, Plastic deformation, Electron backscattering diffraction (EBSD), Microstructure

Xiao Jin, Bao-Qin Fu, Cheng-Lu Zhang, Wei Liu. Study of Dislocation Boundary Structure in Al-Li Alloy During Bending[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(9): 1149-1155.

Figures/Tables 6

Fig. 1 Microstructure of 2060-T8 alloy with the bend radius is 10 mm (black lines represent grain boundary with the misorientation larger than 15°): a BSE image; b EBSD map reconstructed from all Euler; c misorientation axes map.

Fig. 2 Microstructure of 2060-T8 alloy with the bend radius is 5 mm: a BSE image under tension; b misorientation axes map under tension; c BSE image under compression; d misorientation axes map under compression.

Fig. 3 Microstructure of 2060-T8 alloy with the bend radius is 3 mm: a BSE image under tension; b misorientation axes map under tension; c BSE image under compression; d misorientation axes map under compression.

Fig. 4 {111} pole figures of the grains with different microstructures: a type A, two sets of GNBs; b type B, one set of GNBs; c type C, large cell structure.

Fig. 5 Angles between GNBs and FA in grains.

Table 1 Schmid factors of all slip systems in grains during bending

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