Hardening, recovery, and creep in fcc mono- and polycrystals. [Strain hardening and softening superposition, strain-rate dependence]

Conference · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7317855

Mecking, H; Kocks, U F; Fischer, H

It is shown that the Bailey-Orowan approach to simultaneous strain hardening and recovery is in conflict with experimental results on the work-hardening behavior of many fcc mono- and polycrystals, and therefore should not be used in creep theories either. A more promising approach is the superposition of strain hardening and strain softening, a term used for mechanically rather than thermally activated recovery processes. The strain-rate dependence of the mechanical properties is then characterized by two exponents m and n, one for the isostructural flow stress and one for the strain-softening process. The latter dominates steady-state creep up to temperatures of about 0.6 of the melting point, and can, by extrapolation, even explain high-temperature creep.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7317855
• Report Number(s): CONF-760804-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALUMINIUM
CREEP
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
ELEMENTS
FCC LATTICES
FLUID FLOW
HARDENING
MECHANICAL PROPERTIES
MELTING POINTS
METALS
MONOCRYSTALS
PHYSICAL PROPERTIES
POLYCRYSTALS
RECOVERY
STEADY-STATE CONDITIONS
STRAIN HARDENING
STRAIN RATE
STRAIN SOFTENING
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE