TETRAGONAL DOMAIN SWITCHING VIA REVERSIBLE T-REVERSIBLE-ARROW-M PHASE-TRANSFORMATION

Grinding-induced t reversible arrow m phase transformation and the res ultant texture in ceria-yttria-doped tetragonal zirconia polycrystals with varied tetragonality have been studied by XRD. It is observed tha t the reversible t reversible arrow m phase transformation occurs duri ng grinding and the intensity ratio of I((002)t)/I((200)t) increases w ith the transformability. The author proposes that the texture induced by grinding at low temperatures is due to the tetragonal variant reor ientation via cyclic, reversible t reversible arrow m phase transforma tion, termed ''transformational domain switching'', instead of the fer roelastic one.