Study on Damping Capacities of ZK60-2.8Nd Magnesium Alloy

Damping properties of ZK60-2.8Nd magnesium alloys as-cast, solution and extrusion were investigated by dynamic mechanical thermal analyzer. The results show that ZK60-2.8Nd magnesium alloy extrusion and solution exhibit almost the same strain independent damping value as that of alloy as-cast, the critical strain amplitude is about 5×10^-5. Solution treatment effects the distribution of solution atoms, and dynamic re-crystallization during the hot extrusion increases movable dislocation density ρ, which makes the dislocations easier to move on the basal plane. Within the strain range of 5×10^-5≤≤4×10⁻⁴, the strain dependent damping value of ZK60-2.8Nd magnesium alloy as-solution is the highest, and that of the alloy as-cast is the least due to the grain sizes increase of the alloy as-solution and dynamic re-crystallization of the alloy as-extrusion leading the increase of movable dislocation density. Within scope of the experiment, the maximum damping value of alloy as-cast, solution and extrusion is 0.03371, 0.01546 and 0.01392, respectively.