Gaining flexibility in the design of microstructure, texture and shape memory properties of an Fe-Mn-Si-Cr-Ni alloy processed by ECAE and annealing

Druker, Ana Velia; Baruj, A.; Isola, L.; Fuster, V.; Malarrı́a, J.; Bolmaro, R.E.

doi:10.1016/j.matdes.2016.06.036

Cited by 14 publications

(9 citation statements)

References 24 publications

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“…We have previously processed a ferrous SMA by ECAE and found a microstructure similar to that shown in Figure a, that is, stacking faults, accompanied by a high density of dislocations and deformation bands in the austenitic matrix . As occurred in the UR sample, we expected a higher DSR.…”

Section: Resultsmentioning

confidence: 65%

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Is it Possible to Use Rolling Methods to Improve Textures on Fe–Mn–Si Shape Memory Alloys?

et al. 2017

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No uniform rolling deformation produces shear strains that give rise to textural and microstructural heterogeneities in processed metals and alloys. In this work, the authors investigate Fe-30Mn-4Si shape memory alloy sheets rolled in different conditions at 600 C, in order to determine the process giving rise to the best structure and the strongest {100}<110> shear texture. This crystallographic orientation is the most favorable for the g ! e martensitic transformation, which provides the shape memory effect in these alloys. In the current conditions, the authors find that unidirectional rolling produces a shear texture in sheet's surface layers. The authors compare the texture and microstructure from this process to those obtained from reverse rolling and single-roller drive rolling.

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Section: Resultsmentioning

confidence: 65%

“…Current authors have used ECAE to develop textures favorable to improve the degree of shape recovery (DSR), since the material has a large <110> component, near the ideal <441>, in the extrusion direction . However, ECAE is not an industrial continuous deformation process generally accepted for fabrication purposes.…”

Section: Introductionmentioning

confidence: 99%

Is it Possible to Use Rolling Methods to Improve Textures on Fe–Mn–Si Shape Memory Alloys?

et al. 2017

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“…As Straumal et al [34,35] stated, the twins frequently appear in FCC metals with low-to-medium stacking fault energy. Martensite and the twins are readily observed in FeMnSiCrNi SMA since FeMnSiCrNi SMA possesses low stacking fault energy [9][10][11]. The formation mechanisms of martensite and the twins Figure 7 shows microstructures of FeMnSiCrNi SMA undergoing compression at the various strain rates at 1000 • C in the CA model, which corresponds to a true strain of 0.9.…”

Section: Microstructural Evolution Of Drxmentioning

confidence: 99%

“…Among the alloying elements, the addition of Cr and Ni contributes to improving the corrosion resistance of FeMnSi SMAs. The FeMnSiCrNi SMAs have been widely investigated by many researchers [10][11][12]. It is generally accepted that hot working is an indispensable approach to making FeMnSiCrNi SMAs into products for engineering application.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Dynamic Recrystallization of FeMnSiCrNi Shape Memory Alloy under Hot Compression Based on Cellular Automaton

Wang

Xing

Zhang

et al. 2019

Metals

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Dynamic recrystallization (DRX) takes place when FeMnSiCrNi shape memory alloy (SMA) is subjected to compression deformation at high temperatures. Cellular automaton (CA) simulation was used for revealing the DRX mechanism of FeMnSiCrNi SMA by predicting microstructures, grain size, flow stress, and dislocation density. The DRX of FeMnSiCrNi SMA has a characteristic of repeated nucleation and finite growth. The size of recrystallized grains increases with increasing deformation temperatures, but it decreases with increasing strain rates. The increase of deformation temperature leads to the decrease of the flow stress, whereas the increase in strain rate results in the increase of the flow stress. The dislocation density exhibits the same situation as the flow stress. The simulated results were supported by the experimental ones very well. Dislocation density is a crucial factor during DRX of FeMnSiCrNi SMA. It affects not only the nucleation but also the growth of the recrystallized grains. Occurrence of DRX depends on a critical dislocation density. The difference between the dislocation densities of the recrystallized and original grains becomes the driving force for the growth of the recrystallized grains, which lays a solid foundation for the recrystallized grains growing repeatedly.

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“…In the recent years, material properties design garnet high interest and consequently, the relationship between the process parameters and material properties requires more understanding. For example, it is not fully known which are the physical processes occurring during severe plastic deformation (SPD) of solid state materials which lead to significant changes of the typical properties of the raw material [ 24 , 25 , 26 , 27 , 28 , 29 ]. Thus, numerous methods of SPD have been developed to refine the microstructures of SMAs [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the In-Situ Heat Treatment on the Martensitic Transformation and Specific Properties of the Fe-Mn-Si-Cr Shape Memory Alloys Processed by HSHPT Severe Plastic Deformation

Gurău

Ţolea

et al. 2021

Materials

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This work focuses on the temperature evolution of the martensitic phase ε (hexagonal close packed) induced by the severe plastic deformation via High Speed High Pressure Torsion method in Fe57Mn27Si11Cr5 (at %) alloy. The iron rich alloy crystalline structure, magnetic and transport properties were investigated on samples subjected to room temperature High Speed High Pressure Torsion incorporating 1.86 degree of deformation and also hot-compression. Thermo-resistivity as well as thermomagnetic measurements indicate an antiferromagnetic behavior with the Néel temperature (TN) around 244 K, directly related to the austenitic γ-phase. The sudden increase of the resistivity on cooling below the Néel temperature can be explained by an increased phonon-electron interaction. In-situ magnetic and electric transport measurements up to 900 K are equivalent to thermal treatments and lead to the appearance of the bcc-ferrite-like type phase, to the detriment of the ε(hcp) martensite and the γ (fcc) austenite phases.

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Gaining flexibility in the design of microstructure, texture and shape memory properties of an Fe-Mn-Si-Cr-Ni alloy processed by ECAE and annealing

Cited by 14 publications

References 24 publications

Is it Possible to Use Rolling Methods to Improve Textures on Fe–Mn–Si Shape Memory Alloys?

Is it Possible to Use Rolling Methods to Improve Textures on Fe–Mn–Si Shape Memory Alloys?

Investigation of the Dynamic Recrystallization of FeMnSiCrNi Shape Memory Alloy under Hot Compression Based on Cellular Automaton

The Effect of the In-Situ Heat Treatment on the Martensitic Transformation and Specific Properties of the Fe-Mn-Si-Cr Shape Memory Alloys Processed by HSHPT Severe Plastic Deformation

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