Effect of Twin Boundary-Dislocation-Solute Interaction on Detwinning in a Mg-3Al-1Zn Alloy

doi:10.1016/j.jmst.2016.08.023

Abstract

Abstract:

In the present study, the influence of solute atoms together with dislocations at {10\overline{1}2} twin boundary (TB) on mechanical behavior of a detwinning predominant deformation in a Mg alloy AZ31 plate was systematically studied. The results show that a large number of {10\overline{1}2} twins disappear during recompression along the normal direction. Both the TB-dislocation interaction and TB-solute-dislocation interaction can greatly enhance the yield stress of the recompression along the normal direction (ND). However, the solute segregation at {10\overline{1}2} TBs with an intensive interaction with dislocations cannot further enhance the yield stress of ND recompression. The samples with TB-dislocation interaction show a similar working hardening performance with that subjected to a TB-solute-dislocation interaction. Both the TB-dislocation interaction and TB-solute-dislocation interaction greatly reduce the value of work hardening peaks during a detwinning predominant deformation.

Key words: Magnesium alloy, Mechanical behavior, Twinning, Dislocation

Xu Jing,Guan Bo,Yu Huihui,Cao Xuezhen,Xin Yunchang,Liu Qing. Effect of Twin Boundary-Dislocation-Solute Interaction on Detwinning in a Mg-3Al-1Zn Alloy[J]. J. Mater. Sci. Technol., 2016, 32(12): 1239-1244.

Figures/Tables 11

Fig. 1. (a) Optical microstructure and (b) pole figures of the as-used Mg alloy AZ31 hot rolled plate.

Fig. 2. Schematic diagram showing the preparation of specimens for reloading.

Fig. 3. Stress-strain curves under compression along the ND.

Table 1. Yield stress, peak stress and elongation of samples during compression along the ND

Samples	Yield strength (MPa)	Compressive strength (MPa)	Elongation
R3.0% -A-T9%	151	316	12.2%
R3.0% -A	100	293	19.6%
R3.0%	71	293	13.7%
R3.0% -T9%	163	323	13.5%

Fig. 4. Strain hardening curves under compression along the ND.

Fig. 5. Optical microstructures: (a) R3.0% -A -T9%; (b) R3.0% -T9%; (c) R3.0% -A; (d) R3.0%.

Fig. 6. (a) Inverse pole figure map and (b) boundary misorientation map of R3.0 %- T9%.

Fig. 7. (a) Inverse pole figure maps of R3.0%-A-T9% after 2.5% compression along the ND and (b) the formation of many low angle boundaries in detwinned grain.

Fig. 8. Pole images of R3.0%-T9% (a) before and (b) after 2.5% compression along the ND.

Fig. 9. (a) Schematic diagram showing the orientations of twin and matrix after TD pre-compression and (b) the Schmidt factor (SF) in R3.0% under tension along the TD.

Fig. 10. Schematic illustrations showing the microstructures in samples subjected to different pre-treatments: (a) R3%; (b) R3.0%-T9%; (c) R3.0%-A; (d) R3.0%-A-T9%.

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