The Research Of TiFe₂ Laves Phase Intermetallics

The Laves phase intermetallics arouses people's widespread interest as a result of its outstanding high temperature performance, but its serious room temperature brittleness enormously hinder its development.Therefore, how is the room temperature brittleness be improved has already become a difficult problem in recent years ,which the general scientific research worker was urgent needs to solve.In this article,we conduct the research to the brittle improvement of TiFe₂ Laves phase intermetallics through alloying as well as the introduction of the toughness second phase method.The TiFe₂ laves phase intermetallics was alloyed with three kind of alloying elements Mo,V,the Co, , the experimental result indicated that it reduced the degree of hardness in the laves phase in the certain degree, enhanced the Fracture toughness, improved the TiFe₂ laves phase intermetallics room temperature brittleness. Metallographic analysis, analysis for fracture surface of scanning electron microcopy photographs, electron-probe analysis,X-ray powder diffraction analysis, transmission electron microscope analysis have been done for the analysis of microstructurs,fracture apperance,structure,and has carried on the preliminary discussion to the toughening Mechanisms.Finally, According the Empirical Electron Theory of Solids and Molecules (EET),the valence electron structures of TiFe₂ and its alloys were calculated. The approach to the toughening of TiFe₂ Laves phase intermetallics and the influence of alloying element on the brittleness of TiFe₂ Laves phase intermetallics was proposed, the computed result are basically in accordance with the experimental result.