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研究了过饱和ZAC2 7合金在自然时效过程中的组织演变与其阻尼性能的关系。过饱和ZAC2 7合金时效1d后 ,组织中出现了大量的 η相、α相和少量的ε相。随时效时间的延长 ,η相、α相和ε相的量越来越多 ,时效 10d后 ,β相已分解完全并消失。此后各相进一步粒化、聚集 ,在 5 0d后形成了较粗大的、由近似等轴的短棒状的α相、η相和ε相组成的平衡组织。过饱和ZAC2 7合金在自然时效过程初期 ,阻尼性能迅速而明显地提高 ,在时效第 10d时声频阻尼性能达到最高值 ,约为 7× 10 -3 ;随后阻尼性能缓慢下降 ,5 0d后基本稳定不变 ,稳定后的阻尼性能约为4× 10 -3 。过饱和ZAC2 7合金的阻尼来源于界面阻尼和位错阻尼 ,η相和ε相从过饱和ZAC2 7合金中的脱溶以及溶质原子和淬火空位与位错的交互作用是过饱和ZAC2 7合金阻尼性能产生变化和提高的主要原因。ZAC2 7合金均匀化热处理及自然时效是一种很好的提高阻尼性能的热处理工艺。
The relationship between the microstructure evolution and damping properties of supersaturated ZAC2 7 alloy during natural aging was studied. After supersaturated ZAC2 7 alloy was aged for 1 day, a large amount of η phase, α phase and a small amount of ε phase appeared in the microstructure. With the extension of aging time, the amount of η phase, α phase and ε phase are more and more. After aging for 10 days, the β phase has decomposed completely and disappears. After that, each phase was further granulated and aggregated, forming a coarser coarse-equiaxed microstructure consisting of approximately equiaxed short rod-shaped α-phase, η-phase and ε-phase after 50 days. The damping property of supersaturated ZAC2 7 alloy rapidly and obviously increases at the initial stage of natural aging, reaching the highest value of about 7 × 10 -3 at the 10th day after aging, and the damping property slowly decreases after 50 days. The stability of the damping performance is about 4 × 10 -3. The damping of the supersaturated ZAC2 7 alloy is due to the interface damping and dislocation damping. The η and ε phase desolvation from the supersaturated ZAC2 7 alloy and the interaction between the solute atoms and the quenching vacancies and dislocations are supersaturated. ZAC2 7 alloy damping The main reason for the performance changes and enhancements. ZAC2 7 alloy homogenization heat treatment and natural aging is a good heat treatment process to improve the damping properties.