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(a) A schematic illustration of the CMSX-4, of which phases are periodically separated into two phases of γ-phase and γ′-phase. (b) The picture of specimens and fabricated microcavities observed using SEM. The left specimen is only polished; the right one is etched with aqua regia. The color appears as blue because of interference. The SEM image shows an oblique view of the fabricated microstructures. Rectangular microcavities are arrayed periodically.
(a) The relative reflectance spectra of specimens with 360, 540, and 720 s etching. The fabricated microcavity shows width of 0.33 μm for all specimens and depths of 0.14, 0.23, and 0.27 μm, respectively, for 360, 540, and 720 s etched specimens. Arrows indicate the minima of respective spectra. (b) The binary image used for the numerical simulation, which considers the inhomogeneity of size and microcavity uniformity. (c) An SEM image of a top view of specimens with 0.27 μm depth of the microcavity attributed to the binary image.
Measured normal emittance spectra of the specimen with 0.27 μm microcavity depth and mechanically polished flat CMSX-4. The emittance spectra were measured from 1.5 μm to 8.0 μm at 973 K. The inset portrays a top view of the SEM image after normal emittance spectra measurements. The surface morphology is unchanged after 2-h heating at 973 K. The measured normal emittance at 973 K shows good agreement with the specimen emittance before heating estimated from measured reflectance at room temperature.
A top view of SEM images at the microstructured CMSX-4 with different aging treatment times. Aging treatments are performed for (a) 1 h, (b) 12 h, and (c) 24 h.
The relative reflectance spectra of CMSX-4 with 1, 12, and 24 h aging processes. The widths are 0.27, 0.42, and 0.53 μm for each specimen. Arrows indicate the minima of respective spectra.
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