采用动态力学分析仪(DMA)结合显微组织观察, 研究了淬火后时效温度以及微量Zr+Si对Zn-22%Al合金阻尼性能的影响. 结果表明, 随着时效温度的升高, 过饱和铝固溶体(α'相)分解加速, 片层状组织数量增加并粗化, 相界面数量减少, 合金的阻尼性能降低. 向Zn--22%Al合金中添加微量的Zr+Si后, Zr可抑制合金内粗大树枝晶的生成, 细化枝晶; Si可降低α'相分解速率, 部分α'相在较低温度下分解成粒状组织, 增加铸态合金内相界面数量, 同时初生 Si相与基体形成非共格界面, 产生Si相/基体界面弛豫行为, 从而显著提高合金的阻尼性能. Si相与基体因热错配引入的位错通过原子的互扩散而逐渐消失, 对合金阻尼性能的影响较小.
The influences of aging temperature and minor addition of Zr+Si on the damping property of Zn-22%Al alloy were investigated by dynamic mechanical analyzer (DMA) and microstructure observation. The results show that with the increase of aging temperature, the decomposition of super-saturated solid solution of Al (α' phase) is accelerated, resulting in increasing and coarsening of the lamellar structure, which will impair damping property. In addition, the damping property of Zn-22%Al alloy could be significantly improved by the minor addition of Zr+Si elements, which induced microstructure refinement and increase of interface. The dislocations induced by thermal mismatch between Si phase and matrix have little influence on the damping property of alloy, as the inter--diffusion of atoms makes dislocations decrease gradually.
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