By Dana Bell
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Extra info for A-10 Warthog in detail & scale - D&S Vol. 19
6). The peaks belonging to the α phase are not in pairs and are quite broad. The diffraction patterns from the first and the second scans at 700 °C are identical. The oxide layer has grown to a thickness greater than the effective penetration depth of the beam. Furthermore, the diffraction pattern is from an inhomogeneous surface oxidised layer with a continuous concentration gradient of oxygen from the surface into the depth. A further increase of the temperature up to 800–1000 °C shows the presence of the main reflections of the hcp α phase only (Fig.
This is in strict correspondence with studies by Gupta and Wiezorek (2003). The lamellar phase thickness is defined as the edge-to-edge dimension (measured perpendicular to the phase boundary) of the adjacent lamellae for a given phase. The existence of γ variant is not seen in the TEM micrographs (Figs. 13) and therefore each variant is not discriminated. The thickness of the bright regions is measured, whatever the number of variants (invisible), so the measured thickness is equivalent to inter-α2 thickness or α2 inter-spacing.
This should lead to an understanding of the processes at the alloys’ surfaces during high-temperature exposure. 2 Titanium alloys: modelling of microstructure Measurements at room temperature The diffraction patterns obtained from the SR measurements at room temperature for Ti 6-4, Ti 6-2-4-2 and β21s alloys with different heat treatment conditions are shown in Figs. 3. 1 Diffraction patterns at room temperature and profile fits (dotted lines) in the range of 30–40° 2θ for Ti-6Al-4V under different heat treatment conditions.
A-10 Warthog in detail & scale - D&S Vol. 19 by Dana Bell