Abstract:Since some transition metal diborides have the same crystal structure with TiB₂, which can react with TiB₂ to form solid solution by adequate technique. With ZrB₂ used as additive, the TiB₂-ZrB₂ solid solution was prepared by hot pressing. The effects of additive content on mechanical properties of composite were investigated. The microstructure analyzing were employed by EPMA, SEM and TEM. It is shown that TiB₂ can partly form solid solution with ZrB₂ and redound to gain uniform grains, which results in the increase of mechanical properties.

Key words:  solid solution; TiB₂- ZrB₂; mechanical properties; microstructure