High-temperature creep of a CoNiCrAlY bond coat alloy

0507171 - ÚFM 2020 RIV CH eng J - Článek v odborném periodiku
Dobeš, Ferdinand - Dymáček, Petr - Hasegawa, M. - Iwashita, M.
High-temperature creep of a CoNiCrAlY bond coat alloy.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 759, JUN (2019), s. 272-277. ISSN 0921-5093. E-ISSN 1873-4936
Grant CEP: GA MŠMT(CZ) EF16_013/0001823
Institucionální podpora: RVO:68081723
Klíčová slova: CoNiCrAlY bond coat alloy * High entropy alloy * Creep * Powder metallurgy * Zener-Hollomon parameter
Obor OECD: Materials engineering
Impakt faktor: 4.652, rok: 2019
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0921509319306446?via%3Dihub

Creep tests of a CoNiCrAlY bond coat alloy were conducted in the temperature range from 1073 K to 1473 K. The alloy was prepared from a powder with a nominal chemical composition of 34.2% Co, 28.6% Ni, 21.2% Cr, 15.6% Al, 0.4% Y (atomic percent is given throughout) by consolidating it under a stress of 60 MPa and annealing it at 1473 K. The final composition of the alloy is 36.3% Co, 29.6% Ni, 21.0% Cr, 12.8% Al and 0.3% Y. The stress exponent n decreases with the increasing temperature from 3.9 at 1073 K to approximately 1 at 1473 K. Consequently, the activation energy of creep is stress dependent and ranges from 512 kJ/mol to 224 kJ/mol with increasing stress. Combined creep and constant strain rate data can be described by the Garofalo (sinh) equation. A comparison of the results with available creep data of free-standing bond coats is presented. Creep resistance of the present alloy clearly overwhelms the resistance of bond coat alloys previously summarized by Wood.
Trvalý link: http://hdl.handle.net/11104/0299674