Funct. Mater. 2020; 27 (1): 79-86.


Structure, mechanical characteristics, oxidation and cavitation resistance of Fe-Cr-Al based alloys

I.V.Kolodiy, V.A.Belous, M.A.Bortnitskaya, R.L.Vasilenko, V.N.Voyevodin, V.I.Kovalenko, A.S.Kuprin, V.G.Marinin, V.D.Ovcharenko, G.Y.Rostova, P.I.Stoev, M.A.Tikhonovsky, G.N.Tolmachova, A.S.Tortika

National Science Center "Kharkiv Institute of Physics and Technology", 1 Academichna Str., 61108 Kharkiv, Ukraine


Fe-Cr-Al alloys are considered as one of the possible replacement of zirconium alloys for nuclear fuel claddings. The microstructure, phase composition, oxidation resistance, mechanical properties and cavitation resistance of one commercial and four experimental Fe-Cr-Al alloys doped with yttrium, molybdenum and zirconium are studied in this work. All alloys under study have the BCC phase as the main. Alloying with ~ 2 % of zirconium results in the formation of microstructure consisting of the matrix phase grains and intergranular eutectic: BCC matrix phase + FCC Laves phase ZrFe2. The highest resistance to oxidation in air at temperature of 1300°C is observed in the alloy doped with yttrium and molybdenum. Microhardness, nanohardness and yield strength have close values for all alloys except for the Zr-doped alloy which has significantly higher values of these parameters. The Fe-Cr-Al alloy doped by Y, Mo and Zr is the most cavitation resistant one.

Fe-Cr-Al alloy, structure, oxidation resistance, cavitation, phase composition.
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