| 冷轧Ti/Al层状复合材料固-液反应过程中的界面微观组织演变 |
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| 引用本文： | 张建宇,赵小佳,王艳辉,陈庆安,李河宗,陈亚宇.冷轧Ti/Al层状复合材料固-液反应过程中的界面微观组织演变[J].稀有金属材料与工程,2021,50(7):2375-2384. |
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| 作者姓名： | 张建宇 赵小佳 王艳辉 陈庆安 李河宗 陈亚宇 |
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| 作者单位： | 机械与装备工程学院,机械与装备工程学院,邯郸学院,机械与装备工程学院,机械与装备工程学院,机械与装备工程学院 |
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| 基金项目： | National Natural Science Foundation of China (No.51807047), the Youth Top Talent Science and Technology Research Project of Hebei Province Universities (BJ2019003), S&T Program of Hebei (20373901D), the Natural Science Foundation of Hebei Province of China (No.E2019402433), and the Research and Development Project of Science and technology of Handan city of China (19422111008-19). |
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| 摘 要： | 将冷轧Ti/Al层状复合材料在675~750 ℃下进行不同时间的退火处理，退火过程中钛和铝都保持过剩，研究了Ti/Al层状复合材料的界面微观组织演变。结果表明：Ti和Al的界面层由2个亚层组成，其中一个为紧密的TiAl3亚层，其微观结构为紧密的TiAl3层，其中分布着随机取向的充满Al的裂纹，另一个为颗粒状的TiAl3亚层，其微观组织结构是颗粒状的TiAl3分布在Al基体中。在不同的退火温度和时间条件下，紧密TiAl3亚层的厚度几乎没有变化，但是颗粒状亚层的厚度随着退火温度及时间的增加而增加；另外，界面层中的TiAl3颗粒的体积分数在不同的温度下均随着退火时间的延长而下降。因此提出了反应扩散模型来描述界面层的形成机理，在此模型中，TiAl3相是化学反应和扩散的结果，并且也考虑了TiAl3相的溶解。计算结果表明TiAl3相的形成与生长由化学反应控制，其等效厚度与退火时间之间遵循线性规律，这主要是因为Ti和Al原子能够快速地通过紧密的薄TiAl3亚层。
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| 关 键 词： | 微观组织演变 固-液反应 Ti/Al层状复合材料 动力学 |
| 收稿时间： | 2020/11/23 0:00:00 |
| 修稿时间： | 2021/1/15 0:00:00 |
Interfacial Microstructure Evolution During Solid-Liquid Reaction in Cold-Rolled Ti/Al Laminated Composites |
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| Zhang Jianyu,Zhao Xiaoji,Wang Yanhui,Chen Qing''an,Li Hezong and Chen Yayu.Interfacial Microstructure Evolution During Solid-Liquid Reaction in Cold-Rolled Ti/Al Laminated Composites[J].Rare Metal Materials and Engineering,2021,50(7):2375-2384. |
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| Authors: | Zhang Jianyu Zhao Xiaoji Wang Yanhui Chen Qing'an Li Hezong and Chen Yayu |
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| Affiliation: | School of Mechanical and Equipment Engineering,Hebei University of Engineering,School of Mechanical and Equipment Engineering,Hebei University of Engineering,Hebei Key Laboratory of Heterocyclic Compounds,Handan University,School of Mechanical and Equipment Engineering,Hebei University of Engineering,School of Mechanical and Equipment Engineering,Hebei University of Engineering,School of Mechanical and Equipment Engineering,Hebei University of Engineering |
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| Abstract: | Cold-rolled Ti/Al laminated composites were annealed at 675~750 °C for different time with superfluous Ti and Al, and the interfacial microstructure evolution in Ti/Al laminated composites during annealing was investigated. The results indicate that the interfacial layer between Ti and Al consists of two sub-layers: a compact TiAl3 sub-layer with the microstructure of many randomly oriented cracks filled with Al, and a granular TiAl3 sub-layer with the microstructure of granular particles distributed in Al matrix. The thickness of the compact TiAl3 sub-layer is stable at different annealing temperatures for different durations, but the thickness of the granular sub-layer increases with increasing the annealing temperature and duration. Furthermore, the average volume fraction of TiAl3 phase in the interfacial layer at different temperatures decreases with increasing the duration. A reaction diffusion model, in which the TiAl3 phase is regarded as the result of diffusion and chemical reaction, was established to evaluate the formation mechanism of the interfacial layer. Additionally, the dissolution of TiAl3 phase into liquid Al was considered in the model. The calculated results indicate that the formation of TiAl3 phase is governed by the chemical reaction, and the equivalent thickness of TiAl3 phase in the interfacial layer obeys a linear relationship with annealing time, which is attributed to the rapid diffusion of Ti and Al atoms through the thin TiAl3 compact sub-layer. |
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| Keywords: | microstructure evolution solid-liquid reaction Ti/Al laminated composites kinetics |
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