Quantitative estimation of kink-band strengthening in an Mg–Zn–Y single crystal with LPSO nanoplates

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.

GRAPHICAL ABSTRACT

IMPACT STATEMENT

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.

KEYWORDS:

• Kink-band strengthening
• magnesium alloys
• plastic deformation
• LPSO nanoplate
• dislocation

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability

The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

Additional information

Funding

This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI for Scientific Research in Innovative Areas: ‘MFS Materials Science’ (grant numbers JP18H05478, JP18H05476, and JP18H05475) and partly supported by JSPS KAKENHI JP18H05254. This work was also supported by JST, CREST (grant number JPMJCR2094), Japan.