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Propagation of shear bands and accommodation of shear strain in the ultrafine eutectic-dendrite composite
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Room temperature engineering stress-strain curve and SEM secondary electron image of the as-cast alloy and (b) SEM secondary electron image for a deformed sample. The dashed and small arrows indicate the shear and slip bands.

Image of FIG. 2.
FIG. 2.

Bright-field TEM image (a) and corresponding selected area diffraction patterns [(b) and (c)] of the deformed alloy. The stepped morphology of the interfaces between the dendrites and the eutectic matrix is indicated by black arrows. The dashed circle and small solid arrows indicate moiré fringes and shear bands, respectively.

Image of FIG. 3.
FIG. 3.

Highly magnified bright-field TEM image (a) of the eutectic matrix region for the deformed alloy. HRTEM image (b) as marked A in (a) and the Fourier transformed patterns [(c) and (d)] from the deformed alternating lamellar phase as marked by the dotted square region (B and C) in (b), respectively. Dashed and solid arrows indicate the sharp shear banding in hard layers and the strain field contrast in soft layers related with the propagation of shear bands, respectively. The dashed circle displays moiré fringes at the interface of the alternating lamellar phases.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Propagation of shear bands and accommodation of shear strain in the Fe56Nb4Al40 ultrafine eutectic-dendrite composite