Experimental and modeling investigations of the non-isothermal and isothermal precipitations in an Al-Cu-Mg-Zr alloy with various pre-precipitation microstructures
Experimental and modeling investigations of the non-isothermal and isothermal precipitations in an Al-Cu-Mg-Zr alloy with various pre-precipitation microstructures
复制标题
具有各种预沉淀微观结构的 Al-Cu-Mg-Zr 合金中非等温和等温沉淀的实验和模型研究
DOI：
10.1016/j.matdes.2022.110640
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发表时间：
2022-04-19
影响因子：
8.4
通讯作者：
Zhang, Hui
中科院分区：
文献类型：
--
作者：
Bo, Guowei;Wang, Yinlu;Zhang, Hui
人们发现，Al-Cu-Mg 合金在非等温和等温热过程中复杂的析出演化对其机械性能和电阻率都有影响。因此，沉淀动力学、电阻率和强度演变的建模对于优化这些合金的热处理和加工至关重要。在这项工作中，对具有不同预沉淀微观结构的 Al-Cu-Mg-Zr 合金进行了非等温和等温热过程中的原位电阻率监测以及微观结构表征，以提供沉淀行为的基本见解。结果表明，Al-Cu-Mg-Zr 合金的析出行为（例如主要强化相）高度依赖于析出微观结构和热历史。建立了时间-温度-微观结构-性质图来揭示沉淀特征及其强化功能。最大硬度归因于 Guinier-Preston-Bagaryatsky (GPB) 区域和细 S (Al2CuMg) 相的共同存在。进一步，以原位电阻率作为主要输入数据，在经典Kampmann和Wagner型数值模型（KWN模型）的基础上建立了改进模型。该集成模型不仅可以揭示析出动力学，还可以很好地预测所研究合金在非等温和等温过程中的硬度演变。 (c) 2022 作者。由 Elsevier Ltd 出版。这是一篇基于 CC BY 许可证 (http://creativecommons.org/licenses/by/4.0/) 的开放获取文章。
The complex precipitation evolutions of Al-Cu-Mg alloys during both non-isothermal and isothermal thermal processes have been found to work on their mechanical properties and electrical resistivity. Modeling of the precipitation kinetics, electrical resistivity and strength evolution is therefore essential for optimizing heat treatment and processing of these alloys. In this work, in situ electrical resistivity monitoring during both non-isothermal and isothermal thermal processes and microstructural characterizations were conducted on an Al-Cu-Mg-Zr alloy with different pre-precipitation microstructures to provide fundamental insights of precipitation behaviors. The results showed that precipitation behaviors of Al-Cu-Mg-Zr alloy, such as the dominant strengthening phase, were highly dependent on preprecipitation microstructures and thermal history. A time-temperature-microstructure-properties map was established to unravel precipitation characteristics and their strengthening functions. The maximum hardness was indicated to be attributed to the combined presence of Guinier-Preston-Bagaryatsky (GPB) zones and fine S (Al2CuMg) phase. Further, in situ electrical resistivity was used as the main input data todevelop an improved model based on the classical Kampmann and Wagner type numerical model (KWN model). This integrated model could not only reveal precipitation kinetics but also well predict hardness evolutions of the studied alloy during non-isothermal and isothermal processes. (c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).