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Microstructure and mechanical properties of the superalloy ATI Allvac® 718Plus™

✍ Scribed by Gerald A. Zickler; Ronald Schnitzer; Rene Radis; Rainer Hochfellner; Ralf Schweins; Martin Stockinger; Harald Leitner

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
849 KB
Volume
523
Category
Article
ISSN
0921-5093

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✦ Synopsis

ATI Allvac ® 718Plus TM is a novel nickel-based superalloy, which was designed for heavy-duty applications in aerospace turbines. In the present study the high-resolution investigation techniques, atom probe tomography, electron microscopy and in situ high-temperature small-angle neutron scattering were used for a comprehensive microstructural characterization. The alloy contains nanometer-sized spherical ␥ phase precipitates (Ni 3 (Al,Ti)) and plate-shaped ␦ phase precipitates (Ni 3 Nb) of micrometer size. The precipitation kinetics of the ␥ phase can be described by a classical model for coarsening. The precipitation strongly influences the mechanical properties and is of high scientific and technological interest.

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