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Yixiao Xia, Zeyang Kuang, Ping Zhu, Boyu Ju, Guoqin Chen, Ping Wu, Wenshu Yang, and Gaohui Wu, Hot deformation behavior and microstructure evolution of Be/2024Al composites, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp.2245-2258. https://dx.doi.org/10.1007/s12613-023-2662-1
Yixiao Xia, Zeyang Kuang, Ping Zhu, Boyu Ju, Guoqin Chen, Ping Wu, Wenshu Yang, and Gaohui Wu, Hot deformation behavior and microstructure evolution of Be/2024Al composites, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp.2245-2258. https://dx.doi.org/10.1007/s12613-023-2662-1
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Be/2024Al复合材料的热变形行为与微观组织演化

摘要: 现代航空航天对具有高比强度和高比刚度的材料的需求越来越大。Be金属具有高硬度和低密度的特点,铝合金具有可加工可变形的特点,Be/Al复合材料结合了二者的优点,是一种高比强度、高比刚度的复合材料。本文对含Be质量分数为62wt%的Be/2024Al复合材料进行了热压缩实验,变形温度为500–575ºC,变形速率为0.003–0.1 s–1。本文中使用了应变补偿的Arrhenius模型与修正的Johnson–Cook模型来预测Be/2024Al复合材料的变形行为。结果表明Be/2024Al复合材料的变形激活能为363.364 kJ·mol–1。与传统的陶瓷颗粒增强铝基复合材料相比,由于Be颗粒可变形的特性,使得Be/2024Al复合材料即使在超高的增强体含量下也能够实现变形。两个模型的平均相对误差表明,修正的Johnson–Cook模型更适合低温条件,而应变补偿的Arrhenius模型更适合高温条件。本文根据热压缩实验的结果,绘制了Be/2024Al复合材料的热加工图,并且在热加工图的指导下进行了热挤压实验。对比Be/2024Al复合材料挤压前后的微观组织,发现Be颗粒能与Al基体发生协调变形,Be颗粒沿挤压方向伸长。

 

Hot deformation behavior and microstructure evolution of Be/2024Al composites

Abstract: The high temperature compression test of Be/2024Al composites with 62wt% Be was conducted at 500–575ºC and strain rate of 0.003–0.1 s–1. The strain-compensated Arrhenius model and modified Johnson–Cook model were introduced to predict the hot deformation behavior of Be/2024Al composites. The result shows that the activation energy of Be/2024Al composites was 363.364 kJ·mol–1. Compared with composites reinforced with traditional ceramics, Be/2024Al composites can be deformed with ultra-high content of reinforcement, attributing to the deformable property of Be particles. The average relative error of the two models shows that modified Johnson–Cook model was more suitable for low temperature condition while strain-compensated Arrhenius model was more suitable for high temperature condition. The processing map was generated and a hot extrusion experiment was conducted according to the map. A comparation of the microstructure of Be/2024Al composites before and after extrusion shows that the Be particle deformed coordinately with the matrix and elongated at the extrusion direction.

 

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