Shape memory behavior and tension–compression asymmetry of a FeNiCoAlTa single-crystalline shape memory alloy

Ma, Ji; Kockar, Benat; Evirgen, A.; Караман, И.; Luo, Zhiping; Chumlyakov, Yuriy

doi:10.1016/j.actamat.2011.12.047

Cited by 86 publications

(39 citation statements)

References 24 publications

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“…Unfortunately, most Fe-based SMAs exhibit poor superelastic recovery or small superelastic strains, due to non-thermoelastic martensitic transformation [1][2][3][4][5][6][7], which also results in large temperature and stress hysteresis. Recently, a group of newly discovered Fe-based SMAs: Fe 41.95 Ni 28 Co 17 Al 10.5 X 2.5 B 0.05 (X: Ta, Nb and Ti) polycrystalline alloy [8][9][10], Fe 40.5 Ni 28 Co 17 Al 11.5 X 2.5 (X: Ta, Nb and Ti) single crystals [11][12][13][14][15][16][17][18][19][20][21][22][23], Fe 43.5 Mn 34 Al 15 Ni 7.5 polycrystalline alloy [24] and single crystals [25], have shown large superelastic strain at room temperature. One of the most interesting findings for the Fe 43.5 Mn 34 Al 15 Ni 7.5 SMA was the small tensile stress-temperature slope of about 0.53 MPa/°C in polycrystalline samples and 0.54 MPa/°C in single crystals, with the [1 0 0] orientation, over a large temperature window [24,25].…”

Section: Introductionmentioning

confidence: 99%

The effect of precipitates on the superelastic response of [1 0 0] oriented FeMnAlNi single crystals under compression

et al. 2015

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a b s t r a c tFeMnAlNi shape memory alloys were recently discovered to have a small temperature dependence of the superelastic critical stress in a large superelastic temperature window from À196°C to 240°C. In this work, we investigated the effect of B2 nanoprecipitates on the superelastic characteristics of [1 0 0] oriented Fe 43.5 Mn 34 Al 15 Ni 7.5 single crystals under compression, and found that the size, volume fraction and composition of precipitates strongly influence the transformation temperature, superelastic strain, critical stress for stress-induced martensitic transformation and stress hysteresis of the single crystals. The single crystals aged at 200°C for 3 h show 7.2% superelastic strain with the precipitate size of about 6-10 nm. Longer aging times or higher aging temperature reduces superelastic recovery due to the coarsening of the precipitates.

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Section: Introductionmentioning

confidence: 99%

The effect of precipitates on the superelastic response of [1 0 0] oriented FeMnAlNi single crystals under compression

et al. 2015

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“…2(b)). The moiré pattern is induced by the residual precipitates, because a set of weak diffraction points, which is the sign of precipitates, 8 was observed in the electron diffraction pattern, as shown in Fig. 2(d).…”

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“…The coherent precipitates induced by aging are considered to be the origin of the emergence of the thermoelastic martensitic transformation. 7,8 Besides the function of precipitates to enhance the mechanical properties, 9 such as precipitation-strengthened Al alloys, 10 the existence of precipitates can also be used to result in a martensitic transformation. But the phase evolution of the NCATB alloy upon aging time is not clearly known.…”

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Phase diagram of FeNiCoAlTaB ferrous shape memory alloy on aging time

2017

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Ferrous shape memory alloy, Fe41Ni28Co17Al11.5Ta2.5B0.05, has shown large superelastic strain and strength in previous study. In the fabrication of this alloy, aging process is crucial for the formation of shape memory effect/superelasticity. However, its phase evolution on aging time is not clearly known. In this study, we systematically studied the phase diagram of this alloy on aging time. It is found that the unaged alloy shows a strain glass transition. With the aging time proceeding, the martensitic transformation gradually emerges. The phase diagram can be explained by the formation of coherent precipitates induced by aging. The heterogeneous strain between coherent precipitates and matrix is the driving force responsible for the emerging martensitic transformation. The generic explanation is supposed to be useful in martensitic transformation engineering for developing novel shape memory alloys from non-transforming materials.

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“…This however remains the major roadblock towards a widespread industrial application of Ni-Ti SMAs. [1][2][3][4][5][6] Therefore, alternative shape memory materials like Cu-based 7,8 and Fe-based [4][5][6]9,10 SMAs received a lot of attention due to distinctly lower processing costs compared to conventional Ni-Ti SMAs. Fe-based SMAs are of highest relevance, due to the fact, that alloying elements are cheap and processing routes from steel industry are supposed to be well suited for manufacturing of these alloys.…”

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Electron beam welding of Fe–Mn–Al–Ni shape memory alloy: Microstructure evolution and shape memory response

Krooß

Günther

Halbauer

et al. 2017

Funct. Mater. Lett.

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The present study reports on the impact of abnormal grain growth (AGG) on the microstructural evolution following electron beam (EB) welding of Fe-Mn-Al-Ni shape memory alloy (SMA). Polycrystalline sheet-like material was EB-welded and a cyclic heat treatment, studied in previous work, was conducted for inducing AGG and a bamboo-like microstructure, respectively. Optical and electron microscopy were carried out to characterize the prevailing microstructure upon cyclic heat treatment. For characterization of the functional properties following AGG, a load increase test was conducted. The current results clearly show that good shape memory response can be obtained in Fe-Mn-Al-Ni SMA upon EB welding and subsequent post-heat treatment. These results further substantiate the potential use of conventional processing routes for Fe-Mn-Al-Ni SMA.

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Shape memory behavior and tension–compression asymmetry of a FeNiCoAlTa single-crystalline shape memory alloy

Cited by 86 publications

References 24 publications

The effect of precipitates on the superelastic response of [1 0 0] oriented FeMnAlNi single crystals under compression

The effect of precipitates on the superelastic response of [1 0 0] oriented FeMnAlNi single crystals under compression

Phase diagram of FeNiCoAlTaB ferrous shape memory alloy on aging time

Electron beam welding of Fe–Mn–Al–Ni shape memory alloy: Microstructure evolution and shape memory response

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