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. 2018 Jun 23;11(7):1065.
doi: 10.3390/ma11071065.

The Changes in the Morphology of Bi⁻Sb System Under Centrifugal Force at Room Temperature

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The Changes in the Morphology of Bi⁻Sb System Under Centrifugal Force at Room Temperature

Bartek Wierzba et al. Materials (Basel). .
Free PMC article

Abstract

In this paper, the morphology evolution in a Bi⁻Sb system under the centrifugal force at room temperature is discussed. The rotation speed was 35,000 rotations per minute and the length of the arm (radii) was 88 mm. It is shown, that after the centrifugation the phases become oriented in the direction parallel to the direction of the centrifugal force. Moreover, the voids move in the direction opposite to the centrifugal force direction. The movements of such voids result in their coalescence and finally lead to formation of cracks at the interface between ordered and disordered part of the sample.

Keywords: gravity; high speed rotation; room temperature; sedimentation; voids formation.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The SEM/BSE (scanning electron microscope equipped with backscattered electrons detector) image (a); SEM/EDX (scanning electron microscope/Energy Dispersive X-Ray Spectroscopy) elemental concentration maps of Bi (b); and Sb (c) performed on the Bi–Sb alloy in the as-cast condition. More intensive color indicates higher element concentration.
Figure 1
Figure 1
The SEM/BSE (scanning electron microscope equipped with backscattered electrons detector) image (a); SEM/EDX (scanning electron microscope/Energy Dispersive X-Ray Spectroscopy) elemental concentration maps of Bi (b); and Sb (c) performed on the Bi–Sb alloy in the as-cast condition. More intensive color indicates higher element concentration.
Figure 2
Figure 2
SEM/BSE images of the cross-sections of Bi–Sb alloy showing microstructure in: (a) as-cast condition; (b) after centrifugation; (c) high magnification of ordered part; (d) high magnification of disordered part; and (e) high magnification of crack at disordered and ordered parts interface.
Figure 3
Figure 3
XRD (X-ray diffraction) patterns obtained on the cross-sections of Bi–Sb alloy in: (a) as-cast condition and (b) after centrifugation.

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