Abstract Fe/epoxy resin hybrid structures were fabricated via three-dimensional open-cellular porous Fe/TiB2 composite layers by an in-situ reaction synthesis process. Pores in the porous layer were filled with an epoxy resin to form an interpenetrating phase layer (IPL) consisting of epoxy resin and Fe/TiB2 composite. The relationship between the tensile joint strength perpendicular to the joint interface and structures of the porous layer was investigated. The tensile joint strength increased with increasing the roughness of an end surface of the porous layer but decreased when the surface roughness was higher than approximately 30 μm. The decrement in the joint strength was caused by a transition of the fracture position from an epoxy resin/IPL interface to Fe/IPL interface due to poor adhesiveness of the porous layer/Fe interface. A high-resolution X-ray computed tomography (CT) was utilized for investigating change in area fraction of the epoxy resin with depth from the end surface of the IPL. Based on the X-ray CT and fractography, it was revealed that the joint strength could be understood in view of epoxy resin/IPL interfacial strength at the fracture position estimated from the mixture law when the adhesiveness of the porous layer/Fe interface was enough. Based on the results above, an in-situ reaction induced from a functionally graded powder condition was applied for enhancing joint strength.

中文翻译：

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原位反应法合成多孔Fe/TiB2复合层的Fe/环氧树脂杂化结构的接合强度

摘要 通过原位反应合成工艺，通过三维开孔多孔Fe/TiB2复合层制备Fe/环氧树脂杂化结构。多孔层中的孔被环氧树脂填充以形成由环氧树脂和Fe/TiB2复合物组成的互穿相层(IPL)。研究了垂直于接头界面的拉伸接头强度与多孔层结构之间的关系。拉伸接头强度随着多孔层端面粗糙度的增加而增加，但当表面粗糙度高于约30μm时降低。接头强度的下降是由于多孔层/Fe 界面的粘合性差导致断裂位置从环氧树脂/IPL 界面过渡到 Fe/IPL 界面引起的。高分辨率 X 射线计算机断层扫描 (CT) 用于研究环氧树脂的面积分数随距离 IPL 端面深度的变化。基于 X 射线 CT 和断口分析表明，当多孔层/Fe 界面的粘附性足够时，可以根据混合定律估计断裂位置处的环氧树脂/IPL 界面强度来理解接头强度。 . 基于上述结果，应用由功能梯度粉末条件引起的原位反应来提高接头强度。结果表明，当多孔层/Fe界面的粘合性足够时，可以根据根据混合定律估计的断裂位置处的环氧树脂/IPL界面强度来理解接合强度。基于上述结果，应用由功能梯度粉末条件引起的原位反应来提高接头强度。结果表明，当多孔层/Fe界面的粘合性足够时，可以根据根据混合定律估计的断裂位置处的环氧树脂/IPL界面强度来理解接合强度。基于上述结果，应用由功能梯度粉末条件引起的原位反应来提高接头强度。