Effect of up-quenching time on damping capacity in a ductile Cu-16.59Al-10.55Mn shape memory alloy

Abstract

The relationship between damping capacity and up-quenching treatment is not clear in ductile Cu-Al-Mn shape memory alloys. To address this problem, effects of up-quenching time on evolutions of martensite amount, vacancy concentration, and their resulting damping capacity are investigated in a ductile Cu-16.59Al-10.55Mn alloy. The results show that the damping capacity rises at a lower rate than the amount of martensite does when the up-quenching time is below 15 min. Above 15 min, the damping capacity rises at a higher rate. The amount variation in the quenched-in vacancies results in the different relative increments between the martensite amount and damping capacity. Up-quenching for 180 min does not enhance the damping capacity at a low strain of 1 × 10−4. The reason could be that the concentration of residual vacancies is still rather high.