Fabrication and damping property of a novel Zn–Al–Ag–Sc alloy

Abstract

Novel Zn–22Al–5Ag–0.2Sc (wt-%) alloy was fabricated by adding Ag and Sc elements in the Zn–22Al alloy. AgZn₃ formed after adding Ag element has a remarkable refining effect on both α and η phases, and Al₃Sc formed after adding Sc element can further refine the α phase. Due to the increased densities of grain boundaries and phase interfaces, the Zn–22Al–5Ag–0.2Sc alloy has significantly improved damping at relatively high temperatures. At low temperatures, however, due to the decreased mobility of interfaces, the damping decreases. Solution and quenching treatments can further dramatically improve the damping due to the formation of the eutectoid structure composed of sub-micron α and η phases. Detailed mechanisms have been discussed.

KEYWORDS:

• Zn–22Al–5Ag–0.2Sc alloy
• modification and refinement
• microstructure
• grain boundaries
• interfaces
• damping

Disclosure statement

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

Additional information

Funding

This work was supported by the Foundation Strengthening Program [grant number 2019-JCJQ-142-00] and the Foundation of Key Laboratory of Science and Technology on Integrated Logistics Support, National University of Defense Technology [grant number 6142003190410].