本文選題：砂型鑄造 + 枝晶偏析�。� 參考：《功能材料》2015年13期

【摘要】：通過(guò)砂型鑄造法控制Mn Cu合金的凝固過(guò)程,獲得具有顯著成分偏析的枝晶組織,能夠進(jìn)一步促進(jìn)時(shí)效過(guò)程中調(diào)幅分解的發(fā)生,是提高其阻尼性能的又一有效途徑。采用JN-1倒扭擺、OLYMPUS顯微鏡、SEM、DMA、XRD等手段,系統(tǒng)研究了枝晶偏析對(duì)M2052合金阻尼性能的影響。結(jié)果表明,鑄造M2052合金在鑄態(tài)下,已含有少量孿晶馬氏體,具有一定的阻尼性能;且經(jīng)過(guò)435℃×4 h時(shí)效處理后,該合金的阻尼性能明顯提高(δ=0.26),甚至超過(guò)鍛造M2052合金(δ=0.20)。這主要是由于鑄造成分偏析的富Mn區(qū)可促進(jìn)納米級(jí)高富Mn區(qū)的形成,明顯提高M(jìn)s點(diǎn)(85℃),使冷卻過(guò)程中生成更多數(shù)量的孿晶馬氏體,從而獲得優(yōu)異的阻尼性能。
[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，

本文編號(hào)：2108906