Influence of Heat Treatment on Damping Capacity of Magnesium Alloy AZ91D

摘要

Solution treatment (T4) and precipitation treatment after solution(T6) have been applied on the commercial magnesium alloys AZ91D. Microstructure and dislocation have been examined by SEM and TEM. The microhardness of different phase has also been measured. The damping-stress curve has been gotten at room temperature. The results revealed that the damping capacity of AZ91D was related with the microhardness of the microstructure. The damping capacity of AZ91D increases with the maximum strain amplitude no matter what the heat treatment condition is. There is an onset of the increase at a certain value of the maximum strain amplitude. Possible reasons have been analyzed using G-L theory. The damping capacity of AZ91D belongs to complex phase damping style.