The effect of heat treatment on the precipitation hardening in FeNiCoAlTa single crystals

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....

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-05, Vol.784, p.139327, Article 139327
Main Authors: Czerny, M., Maziarz, W., Cios, G., Wójcik, A., Chumlyakov, Y.I., Schell, N., Fitta, M., Chulist, R.
Format: Article
Language:English
Subjects:
Aging
Annealing
Beta phase
Chemical composition
Coherence
Heat treating
Iron-based shape memory alloys
Martensite
Martensitic transformations
Morphology
Phase transformation
Precipitates
Precipitation
Precipitation hardening
Precipitation heat treatment
Single crystal
Single crystals
Superelasticity
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Summary: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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.139327