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Effect of B addition on the superelasticity in FeNiCoAlTa single crystals
The study focuses on the superelastic effect in single-crystalline boron-doped Fe-based shape memory alloys. Thehomogenized and quenched single crystals were subjected to a heat treatment at 973 K for variable aging times.As a result, small and coherent nanometer-sized $γ′$ (Ni$_3$Al-type) precipitateswere formed. Itwas established thatFe-28Ni-17Co-11.5Al-2.5Ta-0.05B single crystals oriented along [001] direction exhibit the fully reversiblesuperelastic behavior up to 14.3% compression strain at 77 K reaching the maximum theoretical value. Theboron addition suppressed completely the formation of the brittle $β$ phase and reduced the average precipitatesize of the $γ′$ precipitates. Using high-energy synchrotron radiation and high-resolution transmission electronmicroscopy analysis the volume fraction and precipitate size of $γ′$ were determined indicating that both factorsare critical in obtaining the largest superelastic reversibility. Boron addition counters the initial effect of mechanicalstabilization which was detected in single crystals without boron. Unlike the thermally induced martensitictransformation, applied stresses produce a different austenite/martensite interface composed of interchangingaustenite and martensite variants. It is also demonstrated that upon loading/unloading cycles the moving transformationfront divides the material into three district regions i.e. single variant of austenite, austenite intermixedwith martensite and single variant of martensite.
Effect of B addition on the superelasticity in FeNiCoAlTa single crystals
The study focuses on the superelastic effect in single-crystalline boron-doped Fe-based shape memory alloys. Thehomogenized and quenched single crystals were subjected to a heat treatment at 973 K for variable aging times.As a result, small and coherent nanometer-sized $γ′$ (Ni$_3$Al-type) precipitateswere formed. Itwas established thatFe-28Ni-17Co-11.5Al-2.5Ta-0.05B single crystals oriented along [001] direction exhibit the fully reversiblesuperelastic behavior up to 14.3% compression strain at 77 K reaching the maximum theoretical value. Theboron addition suppressed completely the formation of the brittle $β$ phase and reduced the average precipitatesize of the $γ′$ precipitates. Using high-energy synchrotron radiation and high-resolution transmission electronmicroscopy analysis the volume fraction and precipitate size of $γ′$ were determined indicating that both factorsare critical in obtaining the largest superelastic reversibility. Boron addition counters the initial effect of mechanicalstabilization which was detected in single crystals without boron. Unlike the thermally induced martensitictransformation, applied stresses produce a different austenite/martensite interface composed of interchangingaustenite and martensite variants. It is also demonstrated that upon loading/unloading cycles the moving transformationfront divides the material into three district regions i.e. single variant of austenite, austenite intermixedwith martensite and single variant of martensite.
Effect of B addition on the superelasticity in FeNiCoAlTa single crystals
Czerny, M. (author) / Cios, G. (author) / Maziarz, W. (author) / Chumlyakov, Y. I. (author) / Schell, N. (author) / Chulist, R. (author)
2021-01-01
Materials and design 197, 109225 (2021). doi:10.1016/j.matdes.2020.109225
Article (Journal)
Electronic Resource
English
Shape memory effect and high-temperature superelasticity in high-strength single crystals
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