Fracture of ordered Zr/sub 3/Al polycrystals

Journal Article · Sat Apr 01 04:00:00 EST 1978 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02646410· OSTI ID:6270190

Schulson, E M

Metallographic studies of Zr/sub 3/Al polycrystals deformed in tension have established that failure occurs by grain boundary fracture at low temperatures (less than or approx. = to 200/sup 0/K), by microvoid coalescence at intermediate temperatures (approx. = to 295 to approx. = to 875/sup 0/K) and by grain boundary sliding following dynamic recrystallization at high temperatures (greater than or approx. = to 875/sup 0/K). The ductile fracture mode is composed of three separate processes - the nucleation, the growth and the coalescence of microvoids. Microvoid nucleation occurs by the cleavage of hard, second-phase Zr/sub 2/Al particles and by particle/matrix separation, while void growth occurs by the concentration of plastic strain at the crack tip. Both void nucleation and growth occur throughout plastic deformation and generate the damage which eventually causes ductile fracture.

• Research Organization: Atomic Energy of Canada Ltd., Ontario
• OSTI ID: 6270190
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 9; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CRACKS
CRYSTAL STRUCTURE
DEFORMATION
FAILURES
FRACTURE PROPERTIES
FRACTURES
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MICROSTRUCTURE
RECRYSTALLIZATION
SURFACES
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS