Generation Mechanism of Interfacial Layer and Its Effect on Fe-Cr-Ni/Al-Si-Cu-Ni-Mg Composite Performance

Fe-Cr-Ni/Al-Si-Cu-Ni-Mg composite was taken as the experimental material. The chemical composition of interfacial layer was tested. The generation mechanism and influence of interfacial layer on the composite were analyzed. The results indicated that the generation of interfacial layer is sensitive to temperature. Interfacial layer will generate rapidly when temperature reaches 500 ℃ or above. The interfacial layer is mainly composed of Al, Si, Cu, Fe, and Cr, element Ni distributes at the outward of the interfacial layer for the precipitate of Ni later than Si and Cu, and there is almost no diffusion of Ni during the solution treatment. During heat treatment process, unequal quantity changing of metal atom results in disperse or concentrated vacancies or holes near the matrix. The existence of interfacial layer will induce a decrease of compression strength and plasticity at room temperature and an increase of strength at higher temperature comparing with composite without interfacial layer.

界面效应对功能复合材料热传导行为的影响

界面是复合材料内部连接不同两相的桥梁,极大地影响着复合材料的热学、电学、力学等各项性能。作为复合材料领域中的一个新的分支,导热复合材料近年来因电子电器的高速发展的需求而受到越来越多的关注。然而,研究发现,即使采用了高填料填充方案,复合材料的导热系数也很难达到导热填料的百分之几,其中界面热阻是影响复合材料导热系数提升的关键因素。本文从界面层及界面传热效应的角度出发,分析了复合材料内部界面热阻的产生原因,并从界面的理论研究方法、实验表征手段及影响材料内部热传导行为的界面因素等方面对界面效应在功能复合材料热传导上的影响规律进行了讨论。最后,对界面及界面热传导行为的研究状况进行了总结与展望。