MnCu合金通过合适的热处理,可以获得出色的阻尼性能,同时还具有优良的力学性能.本文采用真空熔炼制备了Mn20Cu5Ni2FeCe合金.采用XRD、TEM及DMA等分析测试手段,研究了时效温度对合金微观组织及阻尼性能的影响.结果表明,固溶态合金具有单相 fcc 面心立方结构,其阻尼能力 tanδ值小于0．01,不具备明显的阻尼能力.时效后合金发生调幅分解,析出富Mn相,合金的阻尼能力显著提升.当时效温度为400℃时,合金的tanδ值达到0．045,呈现出高阻尼能力.不同温度条件下合金阻尼能力测试结果表明,在－50~80℃温度范围内,合金的阻尼能力随温度的降低明显升高,表明该阻尼合金在低温下具有重要的应用前景.
After proper heat treatment,MnCu alloys could exhibit excellent damping and mechanical properties. In this paper,Mn20Cu5Ni2FeCe alloy was prepared by vacuum melting,and the effect of aging temperature on the microstructure and damping property of the alloy were investigated by XRD,TEM and DMA techniques.It is shown that the as-quenched Mn20Cu5Ni2FeCe alloy has a single fcc phase structure,with tanδof less than 0.01.During aging process spinodal decomposition occurs and Mn-rich phase precipitates from the matrix phase. The damping capacity was significantly improved and the value of tanδreaches 0.045 when aging at 400 ℃.The results indicated that the damping capacity of the alloy increases with the decrease of the testing environment temperature,implying that the Mn20Cu5Ni2FeCe damping alloy could possess good application prospects at low temperature.
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