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Plastic flow localization in bulk tungsten with ultrafine microstructure
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View: Figures


Image of FIG. 1.
FIG. 1.

Transmission electron micrographs of SPD-processed UFG-W, showing grains and dislocation cell structures refined to sizes of the order of 500 nm.

Image of FIG. 2.
FIG. 2.

(Color online). True stress-strain curves of the UFG-W rectangular samples with square loading faces. The quasistatic tests used strain rates (MTS servohydraulic system). The specimens had a height to width ratio close to 2, following American Society for Testing and Materials standards. The dynamic (Kolsky bar) testing at high rates of used samples with a height to width ratio but , following well-established protocol (see Ref. 9).

Image of FIG. 3.
FIG. 3.

(Color online). Strain rate sensitivity, , is reduced monotonically with microstructure refinement into the UFG regime, in several bcc metals (Fe, Ta, V, open symbols). The values for recrystallized and UFG-W are highlighted using solid symbols. Here the grain size is a measure of the microstructural length scale, for grains and subgrains separated by both high-angle and low-angle boundaries.

Image of FIG. 4.
FIG. 4.

(a) Optical and (b) scanning electron microscope images showing the shear zones, and (c) the intense concentrated plastic flow with crack initiation inside the shear zone.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Plastic flow localization in bulk tungsten with ultrafine microstructure