Chemical and structural analysis of NiAl-Al2O3 interface by FETEM and STEM

In continuous ceramic fiber reinforced intermetallic matrix composites (IMC) the interfacial shear strength plays an essential role for the load transfer from the matrix to the fiber and determines the strength and ductility of the IMCs. The interfacial strength is controlled by the interface structure and chemistry which developed during the IMC-fabrication process. The present investigation focused on the evolution of interface structure and chemistry of NiAl coated Sapphire-fibers during composite fabrication (fiber coating, diffusion bonding and embedded casting).