Ce对Al-Zn-Mg-Cu合金亚快速凝固铸造组织的影响

发布时间：2018-04-22 22:34

  本文选题：亚快速凝固 + Al-Zn-Mg-Cu合金　； 参考：《材料工程》2017年11期

【摘要】：通过XRD,DSC,SEM,EDS等现代分析方法,研究了稀土元素Ce在不同凝固冷却速率下对Al-Zn-Mg-Cu合金显微组织、凝固温度的影响,分析讨论了Ce对合金晶粒细化和熔体净化作用的原理。结果表明,合金的主要析出相为α-Al和MgZn_2型共晶相,MgZn_2固溶了Al,Cu,Mg等元素并形成了Mg(Zn,Cu,Al)_2相,在晶界上溶质元素浓度较高,与α-Al基体共晶形成层片状共晶组织。添加Ce能使合金枝晶间距减小,并减小共晶层片间距和细化共晶组织,显著细化晶粒,并抑制铝合金中的杂质相Al7Cu2Fe的出现。Ce还将合金α-Al基体和共晶相的析出温度分别降低了6.4℃和5.6℃。
[Abstract]:The effects of rare earth ce on the microstructure and solidification temperature of Al-Zn-Mg-Cu alloy at different solidification cooling rates were studied by means of modern analytical methods such as XRDX DSCS SEMS-EDS. The principle of the effect of ce on grain refinement and melt purification of Al-Zn-Mg-Cu alloy was analyzed and discussed. The results show that the main precipitated phases of the alloy are 伪 -Al and MgZn_2 eutectic phase MgZnS _ 2, and the Al _ (Cu) Cu _ (+) Al _ (+ +) _ 2 phase is formed, and the concentration of solute elements at the grain boundary is higher, and the eutectic eutectic lamellar eutectic structure with 伪 -Al matrix is obtained. The addition of ce can decrease the dendritic spacing, decrease the interlamellar spacing and refine the eutectic structure, and refine the grains significantly. The precipitation temperature of 伪 -Al matrix and eutectic phase was reduced by 6.4 鈩，

本文编号：1789260