| Al-Zn-Mg-Cu合金冷却过程中组织演变及其动力学分析(英文) |
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| 引用本文： | 张玉华,杨树财,纪宏志. Al-Zn-Mg-Cu合金冷却过程中组织演变及其动力学分析(英文)[J]. 中国有色金属学会会刊, 2012, 22(9): 2087-2091. DOI: 10.1016/S1003-6326(11)61432-5 |
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| 作者姓名： | 张玉华 杨树财 纪宏志 |
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| 作者单位： | 哈尔滨理工大学工程训练中心;哈尔滨工业大学材料科学与工程学院 |
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| 基金项目： | Project(50975053) supported by the National Natural Science Foundation of China |
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| 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。
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| 关 键 词： | Al-Zn-Mg-Cu合金 组织演变 析出 动力学模型 |
| 收稿时间： | 2011-11-07 |
Microstructure evolution in cooling process of Al-Zn-Mg-Cu alloy and kinetics description |
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| ZHANG Yu-hua,YANG Shu-cai,JI Hong-zhi. Microstructure evolution in cooling process of Al-Zn-Mg-Cu alloy and kinetics description[J]. Transactions of Nonferrous Metals Society of China, 2012, 22(9): 2087-2091. DOI: 10.1016/S1003-6326(11)61432-5 |
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| Authors: | ZHANG Yu-hua YANG Shu-cai JI Hong-zhi |
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| Affiliation: | 1. Engineering Training Center, Harbin University of Science and Technology, Harbin 150080, China; 2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| 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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| Keywords: | Al-Zn-Mg-Cu alloy microstructure evolution precipitation kinetics model |
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