üliplastsus, mis avaldub tänu lokaalseid survepingeid tekitavale faasimuutusele deformeeritavas (taval. keraamilises) materjalis (vt üliplastsus; vrd struktuurüliplastsus), one of superplastic flow mechanisms characterized by internal mismatch stresses produced by the volumetric differences between the two allotropic phases; as different from common structural superplasticity the superplastic effect is induced by temperature cycling through phase transformation (see: superplasticity; compare: structural superplasticity)