Chemically Compatibility Analysis of 3Y-TZP/Fe-Al Composite

The chemically compatibility of iron aluminide with zirconia matrix was analyzed by thermodynamic theory. The results show that the chemical interaction between iron aluminide intermetallic and zirconia matrix will not take place when Al42at%, and this result was certified by XRD,SEM and HREM. HREM image exhibits that the interface between Fe3Al and 3Y-TZP is clean, and no reaction phase exists at the interface. The atom arrangement beside interface between Fe3Al and ZrO2 is partly corresponding, existing at semicoherent state. The mismatch degree δ of spacing between planes in crystal is 30%, and the dislocation induced by mismatch exists at interface.