In situ Al2O3 particle-reinforced Al and Cu matrix composites synthesized by displacement reactions
In situ Al2O3 particle-reinforced Al and Cu matrix composites synthesized by displacement reactions
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DOI：
10.1016/j.jallcom.2010.01.005
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发表时间：
2010-04
影响因子：
6.2
通讯作者：
B. Yang;Miao Sun;Gui-Sheng Gan;Cunguan Xu;Zanjun Huang;Haibo Zhang;Z. Fang
中科院分区：
文献类型：
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作者：
B. Yang;Miao Sun;Gui-Sheng Gan;Cunguan Xu;Zanjun Huang;Haibo Zhang;Z. Fang
本文提出了一种新的原位反应法制备Al_2O_3/Al和Al_2O_3/Cu复合材料。该技术提供了一种新的方法，克服了当通过常规的非原位技术将颗粒直接添加到它们的基体中时增强颗粒的损失和团聚的问题。实验结果表明，在合成过程中引入两种或两种以上的氧化物，可以减少网状Al（Cu）-CuAl_2共晶的存在，这种共晶不仅对断裂韧性不利，而且对显微组织的稳定性也不利。在Al含量不过量的情况下，只有将Al基体转变为Cu基体，才能完全消除网状CuAl 2相。从热力学角度解释了Al_2O_3/Al和Al_2O_3/Cu复合材料中Al（Cu）-CuAl_2共晶的形成和不形成机理。原位合成Al_2 O_3/Al、Al_2 O_3/Al-Si-Cu、Al_2 O_3/Al-Si-Cu-Mn和Al_2 O_3/Cu复合材料的微观结构变化可以从热力学角度来理解。
An innovative in situ reaction technique is developed for the synthesis of Al2O3/Al and Al2O3/Cu composites. This technique provides a new approach overcoming the problems of loss and agglomeration of reinforcement particles when the particles are added directly into their matrixes by a conventional ex situ technique. The experimental results have shown that the presence of network Al(Cu)–CuAl2eutectic, which is detrimental not only to the fracture toughness, but also to the stability of the microstructure, can be reduced from the final product by introducing two or more oxides into the synthesis. Moreover, the network CuAl2phase can be eliminated entirely only by changing Al matrix into Cu matrix when Al amount is not excess in the Al–CuO preforms. The mechanisms of formation or absence of Al(Cu)–CuAl2eutectic in the Al2O3/Al and Al2O3/Cu composites are explained based upon thermodynamics of the systems. The modification of the microstructures in the in situ synthesis Al2O3/Al, Al2O3/Al–Si–Cu, Al2O3/Al–Si–Cu–Mn and Al2O3/Cu composites can be understood in the light of thermodynamics.