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