Al-Zr-Y合金的時效析出機制和性能
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-03-04
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律。
Al-Zr-Y合金的時效析出機制和性能Precipitation mechanism and property of Al-Zr-Y alloy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律。結果表明：Al-Zr-Y合金時效初期首先析出Al3Y相，可能成為Al3Zr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Al3(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)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轉變為沿晶界分布的Al3Y共晶和晶內一次析出微米級Al3Y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出更高的形核密度、更小的析出相尺寸和更優的抗粗化能力，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 ℃。
The aging process of Al-Zr-Y and the effect of Y on the properties of alloy were studied by transmission electron microscopy, scanning electron microscopy and three dimensional atom probe. The results show that,the Al3Y precipitates form as the heterogeneous core at early aging stage of Al-Zr-Y alloy, which accelerates the diffusion and precipitation of Zr, Y has the tendency to cluster in the precipitate and matrix interface after long-time aging. Finally, Al3(Zr,Y) composite precipitates without core-shell structure forms in the alloy. The solubility of Y inα(Al) decreases from 0.13% to 0.03% (mass fraction) after aging at 600 ℃ for 50 h because of Zr. During solidification of Al-0.3Zr-0.08Y, supersaturated Y produces eutectic Al3Y along the grain boundaries and micron level Al3Yin the grain, which makes the content of Y in the matrix is 4 times lower than that of Al-0.30Zr-0.03Y. Al-0.30Zr-0.03Y shows higher nucleation density, smaller precipitate radius and slower coarsening rate. The recrystallization temperature of Al-0.30Zr-0.03Y reaches 500 ℃, which is 125 and 75 ℃ higher than those of Al-0.3Zr and Al-0.3Zr-0.08Y, respectively.
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