Work

Kink strengthening mechanism due to multiple kink bands in long-period stacking ordered magnesium alloy

Year: 2025

Type: article

Abstract: In this study, we numerically investigate the strengthening mechanism in long-period stacking ordered magnesium alloys with two or more kink bands using a higher-order gradient crystal plasticity. From the viewpoint of crystalline-scale mechanics, kink strengthening in specimens with multiple kink bands can be attributed to three primary mechanisms, namely, orientation, defect, and neighboring strengthening. Among these, neighboring strengthening is a novel strengthening mechanism discovered in this study. As the spacing between kink bands decreases, the amplitude of kink strengthening increases. The sum of kink angles is more strongly correlated with the amplitude of kink strengthening than the number of kink boundaries and exhibits an obvious positive relationship with flow stress. The size effect on kink strengthening is also investigated. It is found that kink strengthening exhibits Hall–Petch-like behavior, exhibiting a linear correlation between the inverse of the square root of the kink band width and flow stress. Neighboring strengthening enhances the size effect as the spacing between kinks decreases.

Source: Computational Materials Science

DOI: 10.1016/j.commatsci.2025.114428

Authors: Yuichi Tadano, Natsu Zenimoto

Institution: Saga University

Language: English

Topic: Magnesium Alloys: Properties and Applications

Subfield: Biomaterials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,290

Funders: Light Metals Educational Foundation, Light Metal Educational Foundation, Japan Society for the Promotion of Science