Analysis of deformation twinning in tantalum single crystals under shock loading conditions

The competition between dislocation slip and twinning in tantalum single crystals has been investigated utilizing a crystal level twinning model and the results from gas gun recovery experiments conducted at peak normal stresses of 25 and 55 GPa. The recovered samples were characterized using electr...

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Bibliographic Details
Published in:Journal of applied physics 2013-02, Vol.113 (8)
Main Authors: Florando, Jeffrey N., Barton, Nathan R., El-Dasher, Bassem S., McNaney, James M., Kumar, Mukul
Format: Article
Language:English
Subjects:
Crystal structure
Dislocation density
Dislocations
Evolution
Orientation
Single crystals
Tantalum
Twinning
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Summary:The competition between dislocation slip and twinning in tantalum single crystals has been investigated utilizing a crystal level twinning model and the results from gas gun recovery experiments conducted at peak normal stresses of 25 and 55 GPa. The recovered samples were characterized using electron back scattered diffraction, and the observed twinning fractions were compared with the model. The experimental results show very low twin fractions in all orientations at 25 GPa, and that among (100), (110), (111), and (123) crystals, the (110) crystals had the largest amount of twinning at 55 GPa. The analysis shows that the general trends observed in the experimental data can be reproduced by the model when an orientation dependent dislocation evolution is used. This analysis gives insight into the possible influence of the dislocation density and its evolution on the observed twinning behavior.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4792227