The Pseudobinary Ti‐ZrO ₂

The vertical section Ti‐ZrO 2 within the Ti‐Zr‐O system was investigated by metallographic, X‐ray diffraction, electron probe, and melting point studies. Analyses were conducted using arcmelted specimens which had been equilibrated and quenched from temperatures of 600° to 1600°C. The Ti‐ZrO 2 section is similar to the Zr‐ZrO 2 system. At high temperatures, considerable amounts of Zr and O go into solid solution in Ti, stabilizing α‐Ti to 30 wt% ZrO 2 . From 30 to 98 wt% ZrO 2 an α‐Ti+ZrO 2 region is defined, and at compositions above 98 wt% ZrO 2 , single‐phase ZrO 2 ( ss ) exists. At low temperatures an α‐Ti+(Ti,Zr) 3 O field exists from 22 to 32 wt% ZrO 2 ; this region decreases in size with increasing temperature until it disappears at 1200°C. Above 32 wt% ZrO 2 , a three phase α‐Ti+ (Ti,Zr) 3 O+ZrO 2 field exists; its stability extends from 1200°C at 30 wt% image