Influence of twinning on the constitutive response of Zr: Experiments and modeling

Conference · Thu May 01 00:00:00 EDT 1997

OSTI ID:527923

Chen, Shuh Rong; Gray, III, G T

The stress-strain response of Zr due to twinning is distinctly different from that due to slip as a function of temperature and strain rate. When the applied stress is lower than the transition stress, dislocation slip is the dominant deformation mechanism. The traditional MTS model is shown to adequately represent the constitutive behavior of Zr. Above the transition stress twinning becomes the dominant deformation mechanism where the flow stress increases linearly with strain. In this regime the rate-dependent strain hardening can be described by equations based on thermal activation theory that are very similar to the formula used in the MTS model.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 527923
• Report Number(s): LA-UR--97-906; CONF-970944--7; ON: DE97005032
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
FLOW STRESS
MICROSTRUCTURE
SLIP
STRAIN HARDENING
STRAIN RATE
TWINNING
ZIRCONIUM