Microstructure evolution in cooling process of Al-Zn-Mg-Cu alloy and kinetics description

来源期刊:中国有色金属学报(英文版)2012年第9期

论文作者:张玉华 杨树财 纪宏志

文章页码:2087 - 2091

关键词:Al-Zn-Mg-Cu合金;组织演变;析出;动力学模型

Key words:Al-Zn-Mg-Cu alloy; microstructure evolution; precipitation; kinetics model

摘    要:采用透射电镜(TEM)和差示扫描量热法(DSC)相结合的分析方法,研究不同冷却速率条件下固溶态Al-Zn-Mg-Cu合金冷却过程中的组织演变,并根据DSC结果对该过程进行动力学分析。结果表明:在冷却过程中,合金的主要相转变是η 相(MgZn2)的析出,且η 相在晶内弥散体处以及晶界上形核析出。η相的析出量随着冷却速率的增大而明显减少, 当冷却速率从5℃/min增大到50℃/min时,η相的析出量减少了约75%。在冷却速率恒定的情况下,可以根据DSC曲线,使用Kamamoto相变模型来描述η相的析出过程。

Abstract: The microstructure evolution of Al-Zn-Mg-Cu alloy was studied by differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) during different rate cooling processes. Based on the DSC results, the kinetics analysis was carried out. The results indicate that the precipitation of η phase is the predominant transformation for the alloy during the cooling process after the solution treatment. And the η phase nucleates on dispersoids and at grain boundaries. The amount of η phase decreases with increasing cooling rate, and reduces by 75% as the cooling rate increases from 5 to 50℃/min. The kinetics of the precipitation of η phase can be described by the Kamamoto transformation model when the cooling rate is a constant.

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