Induced kink boundary in Mg-Y-Zn alloy by tube-shape forming

The secondary formability and the effect of shape application on induced kink boundaries are examined using Mg-9at.%Y-6at.%Zn alloy through experimental and numerical studies. A tube-shape is successfully formed without any cracks. This tube-shaped alloy includes kink boundaries associated with the applied shear strain. In the numerical study, a substantial shear strain is created at the contact region, but the shear direction becomes opposite after tube formation. This suggests that de-kinking behavior, such as shrinkage of kink boundaries, has a possibility to occur. In contrast, this formed alloy exhibits higher hardness by a magnitude of 30 Hv than the un-processed alloy. The correlation between kink density and hardness in this tube-shaped alloy is consistent with literature results obtained from several wrought-processed Mg-Y-Zn alloys.

Automated summary

The secondary formability and the effect of shape application on induced kink boundaries in Mg-9at.%Y-6at.%Zn alloy were investigated through experimental and numerical studies. A tube-shaped alloy without any cracks was successfully formed with kink boundaries associated with the applied shear strain. Numerical results showed a substantial shear strain at the contact region, but with an opposite shear direction after tube formation, indicating the possibility of de-kinking behavior. Additionally, the formed alloy exhibited higher hardness by 30 Hv compared to the un-processed alloy, and the correlation between kink density and hardness was consistent with literature results on wrought-processed Mg-Y-Zn alloys.