{<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml:mrow><mml:mn>10</mml:mn><mml:mover accent="true"><mml:mn>1</mml:mn><mml:mo>¯</mml:mo></mml:mover><mml:mn>2</mml:mn></mml:mrow></mml:math>} twin–twin intersection-induced lattice rotation and dynamic recrystallization in Mg–6Al–3Sn–2Zn alloy
Bin-Jiang Lv, Sen Wang, Fu-Hao Gao, Ning Cui, Yinan Li, Tiewei Xu, Feng Guo
Abstract
This study investigated the formation mechanism of new grains due to twin–twin intersections in a coarse-grained Mg–6Al–3Sn–2Zn alloy during different strain rates of an isothermal compression. The results of electron backscattered diffraction investigations showed that the activated twins were primarily {101¯2} tension twins, and 60° <101¯0> boundaries formed due to twin–twin intersections under different strain rates. Isolated twin variants with 60° <101¯0> boundaries transformed into new grains through lattice rotations at a low strain rate (0.01 s−1). At a high strain rate (10 s−1), the regions surrounded by subgrain boundaries through high-density dislocation arrangement and the 60° <101¯0> boundaries transformed into new grains via dynamic recrystallization.