Synergistic enhancement in mechanical and damping properties of Cu-11Al-5Mn-0.7Ti-1Ta alloy through aging treatment

In this work, the aging temperature effects on microstructures, mechanical, and damping properties of Cu-11Al-5Mn-0.7Ti-1Ta were investigated. The outcomes indicated aging can effectively enhance both mechanical and damping properties, and the optimum aging temperature of 400 degrees C was obtained. The associated microstructural changes caused by the precipitated phase after aging resulted in an increase in tensile strength from 386.1 MPa to 631.5 MPa, an increase of 63.5% compared to the original alloy. Meanwhile, the room temperature damping value increased from 0.026 to 0.0581, which was increased by 123.5%. The damping strengthening mechanisms were discussed mainly from the perspective of the change in motionable interface and dislocation behavior induced by precipitated phase after aging treatment. The results in this paper provide a new reference for simultaneously improving mechanical and damping behaviors of Cu-Al-Mn based alloys.