The effect of twinning on the work hardening behavior in Hafnium

Conference · Thu Jan 01 04:00:00 EST 2004

OSTI ID:977500

Cerreta, E K ^[1]; Gray, III, G T ^[2]; Yablinsky, C ^[3]

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1. Ellen K.
2. George T.
3. Clarissa

In many HCP metals, both twinning and slip are known to be important modes of deformation. However, the interaction of the two mechanisms and their effect on work hardening is not well understood. In hafnium, twinning and work hardening rates increase with increasing strain, increasing strain rate, and decreasing temperature. At low strains and strain rates and at higher temperatures, slip dominates deformation and rates of work hardening are relatively lower. To characterize the interaction of slip and twinning, Hf specimens were prestrained quasi-statically in compression at 77K, creating specimens that were heavily twinned. These specimens were subsequently reloaded at room temperature. Twinning within the microstructures was characterized optically and using transmission electron microscopy. The interaction of slip with the twins was investigated as a function of prestrain and correlated with the observed rates of work hardening.

• Research Organization: Los Alamos National Laboratory
• Sponsoring Organization: DOE
• OSTI ID: 977500
• Report Number(s): LA-UR-04-1559
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CORRELATIONS
HAFNIUM
SLIP
STRAIN HARDENING
STRAIN RATE
TEMPERATURE DEPENDENCE
TWINNING