The damping capacity of several high strength magnesium alloys

such as AZ91D

ZK51 （Mg-5Zn-Zr）

WE43

NZ30K （Mg-3Nd-0.2Zn-Zr）

GW103K （Mg-10Gd-3Y-Zr）

GW83K （Mg-8Gd-3Y-Zr）

was examined. The results indicate that the specific damping capacity P0.1 （2π·tanφ） of these magnesium alloys under 10% yield strength stress is in range of 4.71%

8.55%

belonging to medium-damping materials. Based on the average value of P0.1

the specific damping capacity of these high strength magnesium alloys is in following order: WE43

<

ZK51

<

GW103K

<

AZ91D

<

GW83K

<

NZ30K. According to the strain-damping capacity curves

the peak-aging treatment after solution treatment （T6） often reduce the damping capacity of these high strength magnesium alloys

while over aging treatment at high temperature can improve their damping capacity. The reduced damping capacity led by peak-aging treatment maybe related to fine precipitates

while the improved damping capacity by over aging treatment maybe attributed to the coarsening of the precipitates.