枝晶偏析对MnCu合金阻尼性能的影响

发布时间：2018-07-09 09:23

  本文选题：砂型铸造 + 枝晶偏析　； 参考：《功能材料》2015年13期

【摘要】：通过砂型铸造法控制Mn Cu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。
[Abstract]:By controlling the solidification process of Mn-Cu alloy by sand mold casting, dendritic structure with remarkable segregation can be obtained, which can further promote the occurrence of amplitude modulation decomposition during aging, and is another effective way to improve the damping property of Mn-Cu alloy. The effect of dendritic segregation on damping properties of M2052 alloy was systematically studied by means of JN-1 inverted torsion pendulum OLYMPUS microscope SEMMA-DMA-XRD and so on. The results show that the cast M2052 alloy has a small amount of twin martensite in the cast state and has a certain damping property, and the damping property of the cast M2052 alloy after 435 鈩，

本文编号：2108906