發(fā)布時間：2018-03-24 08:26

  本文選題：Al(Zr　切入點：Y)　出處：《中國有色金屬學報》2016年02期

【摘要】：采用透射電鏡、掃描電鏡、三維原子探針等手段研究Al-Zr-Y合金的時效析出行為及Y含量對合金性能的影響規(guī)律。結果表明:Al-Zr-Y合金時效初期首先析出Al_3Y相,可能成為Al_3Zr時效析出的異質核心;長時間時效后,Y有向析出相和基體界面處偏聚的傾向,最終形成無核殼結構的Al_3(Zr,Y)復合析出相;在三元Al-Zr-Y合金中,由于Zr的存在,Y在α(Al)中的平衡固溶度大幅度下降,600℃下的平衡固溶度從0.13%(質量分數(shù))降至0.03%。Y含量較高的Al-0.30Zr-0.08Y在凝固及冷卻過程中,過飽和的Y轉變?yōu)檠鼐Ы绶植嫉腁l_3Y共晶和晶內一次析出微米級Al_3Y顆粒,使鋁基體中的有效Y含量較Al-0.30Zr-0.03Y中的降低4倍。Al-0.30Zr-0.03Y合金在時效過程中表現(xiàn)出更高的形核密度、更小的析出相尺寸和更優(yōu)的抗粗化能力,合金的抗再結晶溫度達到500℃,比Al-0.3Zr和Al-0.30Zr-0.08Y合金的抗再結晶溫度分別高出125和75℃。
[Abstract]:The aging precipitation behavior of Al-Zr-Y alloy and the effect of Y content on the properties of Al-Zr-Y alloy were studied by means of transmission electron microscope, scanning electron microscope and three dimensional atomic probe. It may be the heterogeneous core of Al_3Zr aging precipitation, and after long aging, the precipitated phase and matrix interface tend to be segregated, and finally the coreless shell structure Al _ 3o _ Zr _ Y _ (Y) composite precipitate phase is formed, and in ternary Al-Zr-Y alloy, there is a tendency of segregation between the precipitated phase and the matrix interface, and in the ternary Al-Zr-Y alloy, Due to the existence of Zr, the equilibrium solution degree of Y in 偽 -Al decreased significantly from 0.13 (mass fraction) to 0.03.Y during solidification and cooling. The supersaturated Y was transformed into Al_3Y eutectic and micrometer Al_3Y particles distributed along grain boundaries. The effective Y content in aluminum matrix was reduced by 4 times than that in Al-0.30Zr-0.03Y. Al-0.30Zr-0.03Y alloy showed higher nucleation density during aging. The recrystallization temperature of the alloy is 500 鈩，

本文編號：1657497