Effects of Pre-deformation and Peak Aging on Mechanical and Damping Properties of (CNTs + AlN)/AZ91 Composite

The effects of pre-deformation and peak aging on the mechanical and damping properties of (CNTs + AlN)/AZ91 composites were investigated. The results show that the solid solution treatment, 15% pre-deformation and 15% pre-deformation followed by aging treatment are all favorable to improve the room mechanical properties of (CNTs + AlN)/AZ91 composites. And that the peak aging time is also decreased due to the pre-deformation. However, only the solid solution treatment and 15% pre-deformation can significantly enhance the room damping capacity; while, 15% pre-deformation followed by aging treatment reduces the room damping capacity due to the strong pinning of denser precipitates induced by the peak aging treatment. With temperature increasing, high-temperature background damping activation energy of (CNTs + AlN)/AZ91 composites is decreased after 15%pre-deformation followed by peak aging, which indicates that the high-temperature damping not only is more easily activated, but also the activation temperature is lower and the damping value is higher, and then the better damping efficiency can be realized.