Quantitative estimation of kink-band strengthening in an Mg–Zn–Y single crystal with LPSO nanoplates
Koji Hagihara, Ryohei Ueyama, Toko Tokunaga, Michiaki Yamasaki, Yoshihito Kawamura, Takayoshi Nakano
Abstract
Kink-band strengthening was first quantitatively evaluated using an Mg–Zn–Y single crystal containing long-period stacking ordered (LPSO) nanoplates. The ability of a kink-band boundary to act as a barrier that hinders the motion of dislocations is high and comparable to that of a general random grain boundary. Nevertheless, a kink-band boundary is regarded as a simple tilt boundary in the dislocation model. One reason for the anomalous ability of kink-band boundary acting as barriers is related to its peculiar hierarchical structure, in which many small kink bands with high crystal rotation angles accumulate in a localized region. By the quantitative estimation using the single crystal, the origin of the anomalous ability of kink bands acting as barriers that hinder the motion of dislocation was elucidated.