Nanoprecipitation effects on phase stability of Fe-Mn-Al-Ni alloys

Roca, P. La; Baruj, A.; Sobrero, C.; Malarrı́a, J.; Sade, M.

doi:10.1016/j.jallcom.2017.02.280

Cited by 61 publications

(21 citation statements)

References 31 publications

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“…precipitates. [22][23][24][25][26][27][28][29][30][31][32][33][34][35] It was shown that the superelastic behavior of polycrystalline samples is detrimentally affected by pronounced constraints related to neighbouring grains. [23,31] In contrast, a superior superelastic performance was shown for oligocrystalline samples, i.e., bamboo structures [21,23,26] and single-crystalline samples.…”

Section: Introductionmentioning

confidence: 99%

“…[24,31] As an example, for Fe-Mn-Al-Ni samples with a suitable microstructure superelastic recoverabilities up to 7% and critical stresses for martensitic transformation up to 600 MPa were observed. [29][30][31][32][33]35] Tailoring of such microstructures can be achieved by a cyclic heat treatment conducted between the single-and the two-phase region (α-phase and γ-phase) of the alloy to promote abnormal grain growth (AGG) in the sample. [21,26,27,31] AGG is a process in which a single grain or a few grains grow significantly faster, eventually consuming surrounding smaller grains, finally leading to oligo-or single-crystalline structures in Fe-Mn-Al-Ni.…”

Section: Introductionmentioning

confidence: 99%

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On the Influence of Microstructure on the Corrosion Behavior of Fe–Mn–Al–Ni Shape Memory Alloy in 5.0 wt% NaCl Solution

et al. 2020

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Herein the corrosion behavior of Fe–Mn–Al–Ni shape memory alloys characterized by different microstructures in a 5.0 wt% NaCl solution is investigated. Open circuit potential and potentiodynamic polarisation tests are conducted. Generally, Fe–Mn–Al–Ni shows corrosion properties being similar to pure iron. However, the polarization curves of single crystals indicate the presence of an unstable passive system. The corrosion damage is analyzed by means of optical microscopy and electron microscopy. It is revealed that polycrystalline samples consisting of two different phases induced by heat treatment, i.e., α‐phase and γ‐phase or β‐Mn phase and γ‐phase, are suffering a selective corrosion attack of the α‐phase and β‐Mn–phase, respectively. On the contrary, the single crystal seems to form a protective layer on the surface. Upon presence of stress‐induced martensite, a selective corrosion attack of γ′–martensite is observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Influence of Microstructure on the Corrosion Behavior of Fe–Mn–Al–Ni Shape Memory Alloy in 5.0 wt% NaCl Solution

et al. 2020

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“…Therefore, the MT is thermoelastic in the Fe-Mn-Al-Ni alloy with the b nanoprecipitate. The elastic energy due to distortion of the b precipitates has been estimated by La Roca to range from about 10 to 500 J mol -1 (for aging conditions at 200°C for up to 3 h) depending on the volume fraction of the precipitates, which decreases the MT temperatures [46]. The average stacking order observed in Ref.…”

Section: Martensitic Transformation and Nanoprecipitates In The Fe-mnmentioning

confidence: 96%

Martensitic Transformation and Superelasticity in Fe–Mn–Al-Based Shape Memory Alloys

Omori

Kainuma

2017

Shap. Mem. Superelasticity

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Ferrous shape memory alloys showing superelasticity have recently been obtained in two alloy systems in the 2010s. One is Fe-Mn-Al-Ni, which undergoes martensitic transformation (MT) between the a (bcc) parent and c 0 (fcc) martensite phases. This MT can be thermodynamically understood by considering the magnetic contribution to the Gibbs energy, and the b-NiAl (B2) nanoprecipitates play an important role in the thermoelastic MT. The temperature dependence of critical stress for the MT is very small (about 0.5 MPa/°C) due to the small entropy difference between the parent and martensite phases in the Fe-Mn-Al-Ni alloy, and consequently, superelasticity can be obtained in a wide temperature range from cryogenic temperature to about 200°C. Microstructural control is of great importance for obtaining superelasticity, and the relative grain size is among the most crucial factors.

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“…A very interesting example was reported a few years ago, when the discovery of Fe-Mn-Al with an extremely small volume change (Ando et al, 2009) associated with a martensitic transition led to the development of the first pseudoelastic Fe-based alloys. In fact, the addition of Ni favors the introduction of Ni-rich precipitates, which has enabled pseudoelastic properties to be obtained in Fe-Mn-Al-Ni alloys (Omori et al, 2011(Omori et al, , 2013La Roca, Baruj, Sobrero et al, 2017;La Roca et al, 2015).…”

Section: Alloy Designmentioning

confidence: 99%

“…This finding led to the discovery of one of the first pseudoelastic steels (Omori et al, 2011). Interest in this system increased significantly after this finding (Tseng et al, 2015(Tseng et al, , 2016Vollmer et al, 2015;La Roca et al, 2015;La Roca, Baruj, Sobrero et al, 2017;Omori et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

High-precision face-centered cubic–hexagonal close-packed volume-change determination in high-Mn steels by X-ray diffraction data refinements

et al. 2020

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High-Mn steels attract attention because of their various technological properties. These are mainly mechanical and functional, such as the shapememory effect, high damping capacity, high strength with simultaneous large ductility, the TRIP/TWIP (transformation-and twinning-induced plasticity) effect, low cycle fatigue and high work hardening capacity. All these phenomena are associated with the face-centered cubic (f.c.c.)-hexagonal close-packed (h.c.p.) martensitic transformation which takes place in these alloys. During this phase transition defects are introduced, mainly due to the large volume change between austenite and martensite. Knowing this volume change is key to understanding the mechanical behavior of these metallic systems. In the present article, a full-pattern refinement method is presented. The proposed method uses data obtained by means of conventional X-ray diffraction from regular bulk samples and allows a high-precision calculation of the lattice parameters of both phases, f.c.c. and h.c.p., under conditions very different from randomly oriented (powder) materials. In this work, the method is used to study the effect of chemical composition on the volume change between the two structures. By applying empirical models, the results enabled the design and fabrication of Fe-Mn-based alloys with a small volume change, showing the potential of this new tool in the search for improved materials. research papers J. Appl. Cryst. (2020). 53, 34-44 Florencia Malamud et al. Volume-change determination in high-Mn steels 37

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Nanoprecipitation effects on phase stability of Fe-Mn-Al-Ni alloys

Cited by 61 publications

References 31 publications

On the Influence of Microstructure on the Corrosion Behavior of Fe–Mn–Al–Ni Shape Memory Alloy in 5.0 wt% NaCl Solution

On the Influence of Microstructure on the Corrosion Behavior of Fe–Mn–Al–Ni Shape Memory Alloy in 5.0 wt% NaCl Solution

Martensitic Transformation and Superelasticity in Fe–Mn–Al-Based Shape Memory Alloys

High-precision face-centered cubic–hexagonal close-packed volume-change determination in high-Mn steels by X-ray diffraction data refinements

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