Quantitative assessment of forest-hardening in F. C. C. metals

Journal Article · Sat Feb 28 23:00:00 EST 1987 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(87)90186-6· OSTI ID:5524934

Olivares, F H; Sevillano, J G

Macroplastic deformation results from the long-distance movement of dislocations. In single-phase crystals it implies the dislocation forest traversing the slip plane of the running dislocations and, as a consequence of the non-regular distribution of the ''trees'', dislocation loops are left around the harder islands in their slip planes. The dislocation length so stored represents an increment of the obstacle density already present in other non-coplanar slip systems and thus contributes to their work-hardening. This work presents quantitative results on the contribution by forest cutting in a f.c.c. metal upon flow stress and work hardening rate. It has been obtained by computer simulation of dislocation glide through a mixture of punctual and linear obstacles whose strengths reproduce approximately the strength spectrum of a f.c.c. forest as derived by Shoeck and Frydman. Simulations have been conducted for random arrays of obstacles and spatial dislocation distributions (cells, subgrains). Both the flow stress (and its temperature and strain rate dependence) and the athermal work-hardening rate are in good agreement with those measured for f.c.c. polycrystals in experiments covering large strains.

• Research Organization: Escuela Superior de Ingenieros Industriales, Universidad de Navarra, Urdaneta, 7, 20006 San Sebastian
• OSTI ID: 5524934
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 35:3; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED SIMULATION
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DEFORMATION
DISLOCATIONS
ELEMENTS
FCC LATTICES
HARDENING
LINE DEFECTS
METALS
MONOCRYSTALS
SIMULATION
SLIP
STRUCTURAL CHEMICAL ANALYSIS