通过砂型铸造法控制 MnCu 合金的凝固过程，获得具有显著成分偏析的枝晶组织，能够进一步促进时效过程中调幅分解的发生，是提高其阻尼性能的又一有效途径。采用 JN-1倒扭摆、OLYMPUS 显微镜、SEM、DMA、XRD等手段，系统研究了枝晶偏析对M2052合金阻尼性能的影响。结果表明，铸造 M2052合金在铸态下，已含有少量孪晶马氏体，具有一定的阻尼性能；且经过435℃×4 h 时效处理后，该合金的阻尼性能明显提高(δ＝0．26)，甚至超过锻造 M2052合金(δ＝0．20)。这主要是由于铸造成分偏析的富 Mn区可促进纳米级高富 Mn 区的形成，明显提高Ms 点(85℃)，使冷却过程中生成更多数量的孪晶马氏体，从而获得优异的阻尼性能。
Through the sand mould casting mechod to control the solidification process,MnCu alloy can gain sig-nificant composition segregation of dendritic structure,which can further promote spinodal decomposition in the process of aging.Therefore,the sand mould casting method was an effective way to improve the damping prop-erty of MnCu alloy.In the present work,the effect of composition segregation of dendritic structure on the damping property was investigated systemly by torsion pendulum,OLYMPUS microscope,scanning electron microscope (SEM),dynamic mechanical analysis (DMA)and X-ray diffraction (XRD).Results show that, casting M2052 alloys in as-cast condition has a small amount of twin martensite and damping performance. When aged at 435 ℃ for 4 h,the damping performance of the casting M2052 alloy was improved obviously (δ=0.26),even more than forging M2052 alloy performance (δ=0.2).In the procces of aged treatment,the Mn-rich area of the dendritic structure further promotes the formation of high rich Mn area in nanoscale,and the Ms point was improved remarkablely (Ms=85 ℃).The more twin martensite was generated during the cooling process,so that the casting M2052 alloy have excellent damping performance.
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