Vacancy

Interstitial imperfection

Frenkel imperfection

all of these

core defects

surface defect

superficial defects

temporary defects

High temperature and low strain rates favor brittle fracture

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

Grain growth, recrystallisation, stress relief

Stress relief, grain growth, recrystallisation

Stress relief, recrystallisation, grain growth

Grain growth, stress relief, recrystallisation

naked eye

optical microscope

metallurgical microscope

X-ray techniques