ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Electron backscatter diffraction (EBSD) and electron probe x-ray microanalysis (EPMA) in combination with x-ray diffraction (XRD) were applied for phase identification of the ternary precipitates and accompanying phases in Ti-49.6Al-1.9Fe alloy after heat treatment at 1400°C followed by furnace cooling. The heat treatment resulted in formation of the duplex structure consisting of equiaxed grains of the γ phase (AuCu type) and lamellae of the γ and α2 (Ni3Sn type). The ternary τ2 (Mn23Th6 type) phase, containing 21–22 at. % Fe, was revealed on the grain boundaries of the γ-matrix and lamellae, and is accompanied by α2 precipitates. Different morphologies of the τ2 + α2 colonies were found to differ in chemical composition, coarse particles being depleted in titanium, and the fine particles enriched in it. The combination of EPMA and EBSD in scanning electron microscopy proved to be very effective in local phase identification of specimens with fine multiphase structure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004897801670
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