A new method to measure volume resistivity during tension for strain rate sensitivity in deformation and transformation behavior of Fe-28Mn-6Si-5Cr shape memory alloy

Cao, Bo; Iwamoto, Takeshi

doi:10.1016/j.ijmecsci.2017.09.020

Cited by 22 publications

(3 citation statements)

References 27 publications

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“…To address this issue, the resistivity difference before and after deformation was used to qualitatively characterize the amount of stress‐induced HCP martensite. [ 23–25 ] The specimen was first held at the deformation temperature (77 K or RT) for 5 min, and then the resistivity was measured ( ρ T ). After being bent at 77 K or RT, the resistivity of bent section AB was measured ( ρ TD ), as shown in Figure 2b.…”

Section: Methodsmentioning

confidence: 99%

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Luo,

Fu,

et al. 2024

Adv Eng Mater

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Previous work showed that a maximal recovery strain of 8.4% after being bent at room temperature was realized in annealed cast polycrystalline Fe‐Mn‐Si‐based alloys because of the reduced annealing twin boundaries. Theoretically, higher recovery strains can be expected at cryogenic deformation by reducing thermal activation. To confirm this idea, martensitic transformation behaviors and the recovery strains after being bent at 77 K were investigated in the cast Fe‐(20‐26)Mn‐5.5Si‐8.5Cr‐5Ni alloys. We realized larger recovery strains as high as ∽10.0% in an annealed cast Fe‐23Mn‐5.5Si‐8.5Cr‐5Ni alloy after being bent at 77 K. The reduced thermal activation together with suppressed formation of thermal‐induced martensite by optimizing Mn content can account for the larger recovery strain. These results open up a new avenue for further enhancing the recovery strain in Fe‐Mn‐Si‐based shape memory alloys.This article is protected by copyright. All rights reserved.

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Section: Methodsmentioning

confidence: 99%

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Luo,

Fu,

et al. 2024

Adv Eng Mater

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“…Cao and Iwamoto [33] demonstrated that Fe-28Mn-6Si-5Cr shape memory alloys exhibit negative strain rate sensitivity in volume resistivity when subjected to tension, challenging existing assumptions about the rate insensitivity of SMEs in Fe-SMAs. This insight, derived from precise resistivity measurements using a Kelvin double bridge circuit, advances our understanding of Fe-SMA dynamics and underscores the need for revisiting design and application strategies for these alloys under variable strain rates.…”

Section: Introductionmentioning

confidence: 99%

Self-centering of steel braced frames equipped with Fe-SMA TADAS dampers

Torabizadeh,

Foyouzat,

Asghari

et al. 2024

Smart Mater. Struct.

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This study proposes a novel triangular added damping and stiffness (TADAS) damper that uses the shape memory effect (SME) of iron-based shape memory alloy (Fe-SMA) to provide a self-centering system to recover the initial shape of a structure after significant inelastic deformation induced by nonlinear response of fused elements, without the need for difficult and expensive replacement procedures of conventional TADAS systems. Unlike most studies which consider simplified uniaxial behavior of Fe-SMAs, the present non-linear finite element simulations cover the full 3D material non-linearity of Fe-SMA component based on the SMA constitutive law to capture both flexural and shear behavior in various coupled thermomechanical loadings, including the mechanical loading/unloading, the heating, and the final cooling (as the recovering process). Simulations performed on a one-bay steel frame for different drift ratios reveal that although the dissipation energy of the new device is at most 10% less than the ordinary one, it enjoys the self-centering property to recover the initial shape of the frame before loading, showing that the proposed damper is an effective alternative to ordinary TADAS yielding dampers to achieve the self-centering characteristics.

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“…Fe-Mn-Si shape memory alloys (SMAs) have been extensively investigated in the last four decades due to their lower cost compared to NiTi-based SMAs [ 1 ], their superior mechanical properties, such as high recovery stresses, good machinability, weldability, or formability [ 2 ], and their fair corrosion resistance [ 3 ]. It has been pointed out that small Si additions to Fe-30Mn alloys (in mass.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment and Dynamic Mechanical Analysis Strain Sweep Effects on the Phase Structure and Morphology of an Fe-28Mn-6Si-5Cr Shape Memory Alloy

Popa

Pricop

et al. 2023

Nanomaterials

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Fe-Mn-Si-based shape memory alloys (SMAs) have been extensively investigated since 1982 for various useful properties that enhance the development of different applications such as anti-seismic dampers for very tall buildings, pipe joints, or rail fasteners. In particular, the Fe-28Mn-6Si-5Cr (mass. %) alloy has been mainly used in vibration mitigation or self-adjustable axial displacement applications. Dynamic mechanical analysis (DMA), performed by strain sweeps (SS), enables the monitoring of the evolution of storage modulus and internal friction variations with increasing strain amplitudes at different constant frequencies and temperatures. Thus, applying dynamic bending with various frequencies and amplitudes that actually represents an isothermal mechanical treatment. In the present paper, an Fe-28Mn-6 Si-5Cr (mass. %) SMA was cast by ingot metallurgy, hot-rolled, and water quenched in order to obtain thermally induced martensite and avoid the occurrence of cooling cracks. The influence of the holding time, between 2 and 10 h, at 1050 °C and the effects of DMA-SS performed at three different frequencies were analyzed by a differential scanning calorimetry, an X-ray diffraction, and a scanning electron and atomic force microscopy. The effects of the holding time and mechanical treatment on the structure and morphology of martensite plates were corroborated with the results of the thermal analysis.

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A new method to measure volume resistivity during tension for strain rate sensitivity in deformation and transformation behavior of Fe-28Mn-6Si-5Cr shape memory alloy

Cited by 22 publications

References 27 publications

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Self-centering of steel braced frames equipped with Fe-SMA TADAS dampers

Heat Treatment and Dynamic Mechanical Analysis Strain Sweep Effects on the Phase Structure and Morphology of an Fe-28Mn-6Si-5Cr Shape Memory Alloy

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