本文選題：亞快速凝固 + Al-Zn-Mg-Cu合金　； 參考：《材料工程》2017年11期

【摘要】：通過XRD,DSC,SEM,EDS等現(xiàn)代分析方法,研究了稀土元素Ce在不同凝固冷卻速率下對Al-Zn-Mg-Cu合金顯微組織、凝固溫度的影響,分析討論了Ce對合金晶粒細化和熔體凈化作用的原理。結(jié)果表明,合金的主要析出相為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,在晶界上溶質(zhì)元素濃度較高,與α-Al基體共晶形成層片狀共晶組織。添加Ce能使合金枝晶間距減小,并減小共晶層片間距和細化共晶組織,顯著細化晶粒,并抑制鋁合金中的雜質(zhì)相Al7Cu2Fe的出現(xiàn)。Ce還將合金α-Al基體和共晶相的析出溫度分別降低了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 偽 -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 偽 -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 偽 -Al matrix and eutectic phase was reduced by 6.4 鈩，

本文編號：1789260