Change in damping capacity arising from twin-boundary segregation in solid-solution magnesium alloys

ABSTRACT

The change in twin-boundary mobility that is caused by twin-boundary segregation was investigated in pure magnesium and four binary solid-solution magnesium alloys (Mg-Ag, Mg-Sn, Mg-Y and Mg-Zn alloys). The damping capacity in the vicinity of {$10\overline{1}2$} twin boundaries was measured before and after annealing by nano-dynamic mechanical analysis. The subsequent annealing process led to a lower damping capacity in all magnesium binary alloys, which was in contrast to the results in pure magnesium. This is on account of the segregation of solute atoms in incoherent twin boundaries. The alloying elements, which have the characteristic of a low segregation energy for twin boundaries, effectively prevents the damping capacity degradation.

KEYWORDS:

• Magnesium alloys
• nanoindentation
• segregation
• deformation twins
• damping capacity

Acknowledgements

The authors are grateful to Ms R. Komatsu (National Institute for Materials Science) for her technical help, and acknowledge the support from the large-scale parallel computer system with SGI ICE X at Japan Atomic Energy Agency.

Disclosure statement

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

Additional information

Funding

This work was supported by Japan Society for the Promotion of Science Grant-in-Aid (C) for Scientific Research: [grant numbers 16K06783 and 19K05068], and was partially supported by Elements Strategy Initiative for Structura Materials (ESISM) of MEXT: [grant number JPMXP0112101000].