a specific temperature at which the fracture appearance of a metal changes from being predominently ductile to predominantly brittle (compare: fracture transition plastic temperature, nil-ductility transition temperature), temperatuur, mille juures metalli murdepinna makrostruktuur hakkab muutuma valdavalt plastsest valdavalt (vrd plastse murde siirdetemperatuur, hapra murde siirdetemperatuur)