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The role of cold work on the shock response of tantalum
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Image of FIG. 1.
FIG. 1.

Specimen geometries and gauge placements. (a) Free surface velocity and (b) lateral stress.

Image of FIG. 2.
FIG. 2.

EBSD micrographs of tantalum and corresponding pole figures. (a) As received tantalum (rolling direction), (b)50% cold-rolled tantalum (through thickness direction), (c) pole figure (001) of as-received tantalum, and (d) pole figure (001) of rolled tantalum.

Image of FIG. 3.
FIG. 3.

Transmission electron micrographs of tantalum. (a) As-received and (b) cold-rolled.

Image of FIG. 4.
FIG. 4.

Free surface velocity trace from 6 mm thick, as-received tantalum. The flyer was 3 mm thick, impacting at 209 m s.

Image of FIG. 5.
FIG. 5.

Hugoniot of tantalum. (a) Shock velocity—particle velocity and (b) pressure—particle velocity.

Image of FIG. 6.
FIG. 6.

Free surface velocity traces. (a)As-received and (b) cold-rolled.

Image of FIG. 7.
FIG. 7.

Spall strength versus specimen thickness and pulse duration.

Image of FIG. 8.
FIG. 8.

Lateral stress histories. Gauges were placed 2 mm from the impact face. (a) As-received and (b) 50% cold-rolled.

Image of FIG. 9.
FIG. 9.

Elastic precursor decay for as-received and cold-rolled tantalum.

Image of FIG. 10.
FIG. 10.

Elastic precursor decay response in as-received and previously deformed tantalum. Data from the literature have been included for comparison. (a) Razorenov and (b) Asay

Image of FIG. 11.
FIG. 11.

Shear strength in as-received and cold-rolled tantalum, as a function of impact stress.

Image of FIG. 12.
FIG. 12.

Spall strength versus pulse width for tantalum. Results from Llorca and Roy and Razorenov are presented for comparison. Simple straight lines have been fitted to emphasize trends.


Generic image for table
Table I.

Chemical analysis of tantalum bar stock (in ppm).

Generic image for table
Table II.

Elastic properties of pure tantalum.


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Scitation: The role of cold work on the shock response of tantalum