Abstract
Titanium matrix composites reinforced with TiB, TiC and Y 2O 3 are fabricated by a non-consumable arc-melting technology utilizing chemical reaction between titanium, B 2O 3, B 4C and Y. Microstructure of in situ synthesized Y 2O 3 was observed by scanning electron microscope (SEM), transmission electron microscope (TEM) and high-resolution transmission electron microscope (HREM). The Y 2O 3 forms in a way of nucleation and growth. Primary Y 2O 3 tends to grow in dendritic shape and becomes coarse. Secondary Y 2O 3 mostly grows in sphericity and the size is very small. Moreover, there is no fault in the Y 2O 3 reinforcements. The interface between Y 2O 3 and titanium was observed by means of TEM and HREM. Three groups of crystallographic relationships between Y 2O 3 and Ti were found. The interface between the Y 2O 3 and the titanium matrix is very clean and well bonded, and there is no interfacial reaction.
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