Effect of B addition on the superelasticity in FeNiCoAlTa single crystals

Czerny, M.; Cios, Grzegorz; Maziarz, W.; Chumlyakov, Yu. I.; Schell, N.; Chulist, R.

doi:10.1016/j.matdes.2020.109225

Cited by 7 publications

(7 citation statements)

References 64 publications

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“…in the OA condition). This trend is consistent with the literature [18,19]. It should be noted that for the case of 850°C, the drop in area fraction of γ precipitates is observed due to shortened PA time and higher rate of dissolution of γ precipitates.…”

Section: Microstructure Evolution With Aging Temperaturesupporting

confidence: 93%

Aging temperature role on precipitation hardening in a non-equiatomic AlCoCrFeNiTi high-entropy alloy

Nandal

Hariharan

Sarvesha

et al. 2021

Materials Science and Technology

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In the present study, the influence of aging temperature on precipitation hardening in a non-equiatomic Al0.2Co1.5CrFeNi1.5Ti0.3 high-entropy alloy has been evaluated. The aging curves have been deduced for different aging temperatures (650, 750, and 850°C) as a function of time. The aging response was found to be markedly different with varying aging temperatures. A combined FESEM and transmission electron microscope studies have been performed to understand the evolution of precipitates and their characteristics with aging temperature and time. The variation of precipitate morphology, number density and size of precipitates with aging temperature were correlated with the age-hardening response. Additionally, the role of lattice misfit strain on precipitate morphology has been evaluated. GRAPHICAL ABSTRACT

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Section: Microstructure Evolution With Aging Temperaturesupporting

confidence: 93%

Aging temperature role on precipitation hardening in a non-equiatomic AlCoCrFeNiTi high-entropy alloy

Nandal

Hariharan

Sarvesha

et al. 2021

Materials Science and Technology

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“…Czerny et al [19] compared the microstructures and superelastic responses of FeNiCoAlTa and FeNiCoAlTaB single crystals to investigate the effect of the addition of boron to these alloy systems. For FeNiCoAlTa, compressive results revealed that, when annealing times were longer than 10 h, the plastic deformation of austenite produced a permanent strain, resulting in a large irrecoverable strain.…”

Section: Introductionmentioning

confidence: 99%

Superelastic Properties of Aged FeNiCoAlTaB Cold-Rolled Shape Memory Alloys

Tseng,

Song,

Chen

et al. 2024

Metals

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In the present study, microstructure and cyclic tensile tests were used to measure the superelastic responses of Fe40.95Ni28Co17Al11.5Ta2.5B0.05 (at.%) shape memory alloys after 97% cold rolling. Cold-rolled samples underwent annealing heat treatment (1250 °C/1 h) followed by quenching in water or aging heat treatment (700 °C/6 h and 700 °C/12 h) followed by quenching in water. The microstructure results showed that the average grain size increased from 210 μm to 1570 μm as annealing times increased from 0.5 h to 1 h. X-ray diffraction (XRD) spectra for FeNiCoAlTaB (NCATB) showed that in cold-rolled alloys after solution, the strong peak was in the face-centered cubic (γ, FCC) <111> structure. In aged samples, a new peak (γ’, FCC) emerged, the intensity of which increased as aging times rose from 6 to 12 h. Transmission electron microscope (TEM) images showed that the average precipitate size was around 10 nm in 700 °C/6 h specimens and 18 nm in 700 °C/12 h specimens. The precipitate was enriched in Ni, Al, and Ta elements and exhibited an L12 crystal structure. Tensile samples aged at 700 °C for 6 and 12 h exhibited recoverable strains of 1% and 2.6%, respectively, at room temperature. Digital image correlation (DIC) results for the sample aged at 700 °C for 12 h showed that two martensite variants were activated during the superelastic test. Such variants can form corresponding variant pairs (CVPs), which promote tensile deformation. The tensile sample exhibited a gradual cyclic degradation, and a large irrecoverable strain was observed after the test. This irrecoverable strain was the result of residual martensite, which was pinned by dislocations.

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“…in turn, kainuma et al investigated a Fe-Ni-co-Al-Nb-B polycrystalline alloy in which a superelastic effect of over 5% was observed [11]. Many studies concerned the influence of heat treatment on the morphology, size and volume fraction of the γ′ phase, as well as the formation of additional phases, which directly affects the size of the superelastic effect [12][13][14][15][16][17][18][19][20]. it has been reported that Fe-Ni-co-Al-ta single crystal, heat treated at 973 k for 0.5 h shows the maximum value of the superelastic effect of about 15.7% [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies concerned the influence of heat treatment on the morphology, size and volume fraction of the γ′ phase, as well as the formation of additional phases, which directly affects the size of the superelastic effect [12][13][14][15][16][17][18][19][20]. it has been reported that Fe-Ni-co-Al-ta single crystal, heat treated at 973 k for 0.5 h shows the maximum value of the superelastic effect of about 15.7% [18][19][20]. such a level of superelastic strain can be obtained in material with the γ′ precipitate size of approx.…”

Section: Introductionmentioning

confidence: 99%

“…in turn, a small addition of boron (0.05 at.%) in NcAtB single crystals strongly inhibits the formation of the β phase, even in single crystals annealed over longer times (24 h). Moreover, the B doping reduces the average size of the γ′ precipitates to about 3-4 nm having a positive effect on the magnitude and reversibility of the superelastic effect [18,19]. A thorough analysis of the γ′ precipitates was performed by Ma et al using atom probe tomography and transmission electron microscopy in order to determine its size, volume fraction, and distribution.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of γ' Precipitates on the Structural Stability of FeNiCoAlTa and FeNiCoAlTaB Single Crystals After Cyclic Superelastic Deformation

Wójcik,

Chulist,

Szewczyk

et al. 2023

Archives of Metallurgy and Materials

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The Influence of γ' PrecIPITaTes on The sTrucTural sTabIlITy of fenIcoalTa and fenIcoalTab sIngle crysTals afTer cyclIc suPerelasTIc deformaTIon two single crystals with compositions Fe-Ni-co-Al-ta and Fe-Ni-co-Al-ta-B were selected and fabricated by Bridgman method. subsequently, ingots were homogenized, oriented and subjected to a two-step heat treatment process in order to obtain fine and coherent γ' precipitates. subsequently, superelastic cycling experiments were performed at 77 k. the next step included detailed microstructural characterization using transmission electron microscopy and high-energy synchrotron X-ray diffraction measurements together with Rietveld refinement. the results show that the number of fully reversible superelastic strains is very sensitive to the size of γ' precipitates. the smaller (3 nm) γ' precipitates ensured more superelastic response compared to material with larger γ' particles size (5 nm), in which the material did not receive its original shape after 10 cycles even after being heated.

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Effect of B addition on the superelasticity in FeNiCoAlTa single crystals

Cited by 7 publications

References 64 publications

Aging temperature role on precipitation hardening in a non-equiatomic AlCoCrFeNiTi high-entropy alloy

Aging temperature role on precipitation hardening in a non-equiatomic AlCoCrFeNiTi high-entropy alloy

Superelastic Properties of Aged FeNiCoAlTaB Cold-Rolled Shape Memory Alloys

The Influence of γ' Precipitates on the Structural Stability of FeNiCoAlTa and FeNiCoAlTaB Single Crystals After Cyclic Superelastic Deformation

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