Formation of precipitates and recrystallization resistance in Al-Sc-Zr alloys
Formation of precipitates and recrystallization resistance in Al-Sc-Zr alloys
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DOI：
10.1016/s1003-6326(11)61399-x
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发表时间：
2012-08-01
影响因子：
4.5
通讯作者：
Liu Qing
中科院分区：
文献类型：
--
作者：
Jia Zhi-hong;Royset, Jostein;Liu Qing
Al-x%Sc-0.11%Zr 合金（x=0、0.02、0.05、0.08、0.11、0.15）通过冷铸工艺生产。研究了Sc含量对475℃、12h热处理过程中Al-3(Sc,Zr)析出的影响。研究发现Al-3(Sc, Zr)析出物的形核、沉淀和分布与Sc含量密切相关。通过透射电子显微镜（TEM）研究发现，随着Sc含量的增加，析出物的平均半径减小，而析出物的数密度增加。当Sc含量增加时，析出物的分布变得越来越均匀。研究了90%冷轧并在200~600℃温度范围内等温退火半小时的样品的抗再结晶能力。结果表明，由于Al-3(Sc,Zr)析出物密度较高，再结晶温度从不含Sc合金的250℃到含0.15%Sc合金的600℃左右变化。
Al-x%Sc-0.11%Zr alloys (x=0, 0.02, 0.05, 0.08, 0.11, 0.15) were produced by a chill cast procedure. The effect of Sc content on the precipitation of Al-3(Sc,Zr) during heat treatment at 475 degrees C for 12 h was studied. Nucleation, precipitation and distribution of Al-3(Sc, Zr) precipitates were found to be strongly related to the Sc content. With increasing the Sc content, the average radius of the precipitates decreases, while the number density of the precipitates increases, as investigated by transmission electron microscopy (TEM). The distribution of the precipitates becomes more and more homogeneous when the Sc content is increased. The recrystallization resistance of samples that was 90% cold rolled and isothermal annealed for half an hour in the temperature range of 200-600 degrees C was investigated. The results show that the recrystallization temperature varies from 250 degrees C for the alloy without Sc to about 600 degrees C for the alloy containing 0.15% Sc because of the high density of Al-3(Sc,Zr) precipitates.