Using Y_2O_3-ZrO_2 and Al_2O_3-ZrO_2 materials,transformation from tetra-gonal to monoclinic phase has been studied and the orientation relationshipbetween both phases has been determined.

• 本文研究了 Y_2O_3-ZrO_2和 Al_2O_3-ZrO_2材料中四方相(t)ZrO_2向单斜相(m)相变过程,确定两相之间的取向关系,并证实在相变过程中相界处存在反相畴界。