Quasi-in-situ investigation on extension twinning behavior of extruded ZC61 alloy during dynamic compression

In this study, extension twinning nucleation and growth of extruded ZC61 alloy were investigated using a quasi-in-situ electron backscatter diffraction method during interrupted dynamic compression along the extrusion direction. The experimental results show that 63.2% of extension twinning nucleation behavior satisfies the Schmid law during high strain-rate compression. Furthermore, the nucleation of twins and selection of twin variants are influenced by the strain accommodation factor. Non-Schmid twin variants have the highest m' and active twinning systems of neighboring grains can be activated in the same twin variant form. In addition, prismatic and pyramidal slips in neighboring grains play a positive role in low SF twin nucleation.

Automated summary

Under high strain-rate compression, extension twinning nucleation behavior follows the Schmid law, with the nucleation of twins and selection of twin variants influenced by the strain accommodation factor. Non-Schmid twin variants have the highest m' value, and active twinning systems in neighboring grains can be activated in the same twin variant form.