Abstract
For improving the strength and the ductility, woven Ti6Al4V fabric were chosen as the reinforcements for aluminum matrix composites (AMCs). The composites were fabricated by squeeze casting method with a very short solidification time. Interfacial characteristics and hypervelocity impact damage of (2D-Tif)/Al composites were analyzed by means of TEM and HREM. The effects of hypervelocity impact on microstructure evolution in the crater were also discussed. TEM observation showed that TiAl3 interfacial reaction products and TiAl diffusion layer were formed on Ti-Al interfaces during the fabrication stage. Hypervelocity impact results showed that the addition of woven Ti6Al4V fabric improved the hypervelocity impact resistance of aluminum alloy. After hypervelocity impact, the dislocation density in the matrix increased obviously. Microstructure evolution of TiAl diffusion layer was characterized as a phase transition band including TiAl amorphous, nano-grain and multigrain. It was attributed to adiabatic shear temperature rising which caused the formation of amorphous and nano-grain.
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