Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/166
Title: Morphological Development, Coarsening, and Oxidation Behavior of Ni-Al-Nb Superalloys
Authors: Ataş, Mehmet Şahin
Yıldırım, Mehmet
Keywords: Coarsening Behavior
Cyclic Oxidation
Ni-Based Superalloys
Precipitation
High-Temperature Oxidation
Temporal Evolution
Refractory Elements
Thermal-Expansion
Rhenium Addition
Transition-Metal
Site Preference
Creep-Behavior
Heat-Treatment
Degrees-C
Issue Date: 2020
Publisher: SPRINGER
Abstract: The grain structure, precipitate size, morphology, volume fraction and distribution, coarsening kinetics, hardness and cyclic oxidation behavior of (gamma + gamma ') Ni-13Al-2Nb (at.%) and Ni-11Al-4Nb (at.%) superalloys, aged at 800 degrees C from 1 to 256 h, are investigated in detail. For the earliest aging times (1 and 4 h), the morphology of the gamma ' precipitates are cuboidal. With increasing aging time, the gamma ' precipitates coarsen, the average precipitate radius increases, and the morphology changes from cuboidal-to-parallelepipedic-to-irregular shape. The average precipitate size also increases with increasing Nb content from 2 to 4 at.%. At 4 h aging time, Ni-13Al-2Nb and Ni-11Al-4Nb superalloys exhibit peak microhardness values of 3.7 and 3.9 GPa, respectively. The results of cyclic oxidation tests show that important scale spallation is observed for the investigated samples. In addition, the surface scale product of both superalloys at all conditions is NiO.
URI: https://doi.org/10.1007/s11665-020-04926-3
https://hdl.handle.net/20.500.13091/166
ISSN: 1059-9495
1544-1024
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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