%0 journal article
%@ 0921-5093
%A Czerny, M., Maziarz, W., Cios, G., Wojcik, A., Chumkyakov, Y., Schell, N., Fitta, M., Chulist, R.

%D 2020
%J Materials Science and Engineering: A

%P 139327 
%R doi:10.1016/j.msea.2020.139327
%T The effect of heat treatment on the precipitation hardening in FeNiCoAlTa single crystals
%U https://doi.org/10.1016/j.msea.2020.139327
 
%X The main goal of this work was to examine the effect of aging process on the precipitation behavior including phase morphology, chemical composition and degree of coherence in Fe–28Ni–17Co-11.5Al-2.5Ta single crystals. The nano-sized and coherent γ′ precipitates were used for strengthening process. The particles were investigated with transmission and scanning electron microscopies along with high energy X-ray diffraction. The single crystalline material of [100] (001) orientation was subjected to three different heat treatments: slowly cooled, quenched and then annealed with various aging conditions. Aging at 973 K for short times results in coherent 2-6 nm-sized γ′ precipitates and fully reversible superelastic strains while annealing at 973 K for 5 h and longer times leads to the precipitation of larger γ’ particles formed together with β phase which significantly reduces the transformed martensite volume fraction.