On the phase transformation and dynamic stress–strain partitioning of ferrous medium-entropy alloy using experimentation and finite element method

Bae, Jae Wung; Jung, Jaimyun; Kim, Jung Gi; Park, Jeong Min; Harjo, Stefanus; Kawasaki, Takuro; Woo, Wanchuck; Kim, Hyoung Seop

doi:10.1016/j.mtla.2020.100619

Cited by 24 publications

(7 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…values could be evaluated. Instead, the 𝜎 values were evaluated using an indirect method based on the stress balance law [17,21,39,43] according to Eq. ( 5):…”

Section: Resultsmentioning

confidence: 99%

“…In situ neutron diffraction during loading is well known to be a powerful method to understand deformation behavior of the individual phases in multiphase materials [18][19][20][21][22], including deformation slips and twinning in magnesium alloys [23][24][25][26][27][28][29][30]. In our previous report [31], the in situ neutron diffraction during tensile loading up to the specimen fracture was performed using three kinds of samples of Mg97Zn1Y2 alloy: a cast sample (As-Cast), hot extruded samples with the R values of 5.0 (R=5.0) and 12.5 (R=12.5).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Extrusion Ratio in Hot-Extrusion on Kink Deformation during Compressive Deformation in an αMg/LPSO Dual-Phase Magnesium Alloy Monitored by <i>In Situ</i> Neutron Diffraction

et al. 2023

View full text Add to dashboard Cite

To elucidate the effect of extrusion ratio in hot-extrusion on the deformation behavior during compression of Mg97Zn1Y2 alloy containing about 25-vol% long-period stacking ordered phase (LPSO) in the HCP structured α matrix (αMg), in situ neutron diffraction measurements were performed under compressive loading using four types of samples: ascast and after hot extrusion at 623 K with extrusion ratios of 5.0, 7.5 and 12.5. The macroscopic yielding was observed to appear by the occurrence of basal slip of αMg in the as-cast sample and at the onset of twinning in the hot extruded samples. The applied stress to initiate slip, twinning, and kinking increased by hot extrusion and then decreased with increasing extrusion ratio. LPSO shared higher stress than αMg and the ratio to the strength increased as the extrusion ratio increased. In the extruded samples, the phase stress levels in LPSO when kinking initiated were almost the same for the hot-extruded samples, around 580 MPa, regardless of the extrusion ratio.

show abstract

“…values could be evaluated. Instead, the 𝜎 values were evaluated using an indirect method based on the stress balance law [17,21,39,43] according to Eq. ( 5):…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Extrusion Ratio in Hot-Extrusion on Kink Deformation during Compressive Deformation in an αMg/LPSO Dual-Phase Magnesium Alloy Monitored by <i>In Situ</i> Neutron Diffraction

et al. 2023

View full text Add to dashboard Cite

show abstract

“…When 2C 44 – C 11 + C 12 > 0, the elastic energy is minimal, and spinodal decomposition develops in the elastically soft direction of [001] 25 . Y (100) is calculated as Y (100) = (C 11 + 2C 12 ) (C 11 – C 12 )/C 11 and estimated as 219.98 GPa from C 11 = 271 GPa and C 12 = 175 GPa 48 . Therefore, the spinodal strengthening is calculated as 327 MPa, using A = 0.5%, η = 0.00752, and Y = 219.98 GPa.…”

Section: Methodsmentioning

confidence: 99%

Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Park,

Haftlang,

Heo

et al. 2024

Nat Commun

View full text Add to dashboard Cite

Achieving an optimal balance between strength and ductility in advanced engineering materials has long been a challenge for researchers. In the field of material strengthening, most approaches that prevent or impede the motion of dislocations involve ductility reduction. In the present study, we propose a strengthening approach based on spinodal decomposition in which Cu and Al are introduced into a ferrous medium–entropy alloy. The matrix undergoes nanoscale periodic spinodal decomposition via a simple one-step aging procedure. Chemical fluctuations within periodic spinodal decomposed structures induce spinodal hardening, leading to a doubled strengthening effect that surpasses the conventional precipitation strengthening mechanism. Notably, the periodic spinodal decomposed structures effectively overcome strain localization issues, preserving elongation and doubling their mechanical strength. Spinodal decomposition offers high versatility because it can be implemented with minimal elemental addition, making it a promising candidate for enhancing the mechanical properties of various alloy systems.

show abstract

“…The indentation behavior of SMAs under a spherical indenter was studied by the finite element method using commercial software ABAQUS [38]. Due to the symmetries of both geometry and loading conditions, the spherical indentation problem can be reduced to a two-dimensional, axisymmetric model (Figure 1).…”

Section: Numerical Procedures 21 Finite Element Model For Spherical I...mentioning

confidence: 99%

“…In the present study, the SMAs are assumed to exhibit superelastic-plastic behavior, as sketched by the idealized stress-strain curve shown in Figure 2 [38]. σ S L and σ E L are the start and end stresses for the forward transformation, respectively; σ S U and σ E U are the start and end stresses for the reverse transformation, respectively; Ea and Em are the elastic modulus of the austenite and the martensite, respectively; εL is the transformation strain.…”

Section: Materials Model For Smasmentioning

confidence: 99%

Load-induced local phase transformation and modulus of shape memory alloys under spherical indentation by finite element method

et al. 2023

View full text Add to dashboard Cite

Shape memory alloys are a unique class of materials that are capable of large reversible deformations under external stimuli such as stress or temperature. The present study examines the phase transformations and mechanical responses of NiTi and NiTiHf shape memory alloys under the loading of a spherical indenter by using a finite element model. It is found that the indentation unloading curves exhibit distinct changes in slopes due to the reversible phase transformations in the SMAs. The normalized contact stiffness (F/S2) of the SMAs varies with the indentation load (depth) as opposed to being constant for conventional single-phase materials. The load-induced phase transformation that occurred under the spherical indenter was simulated numerically. It is observed that the phase transformation phenomenon in the SMA induced by an indentation load is distinctly different from that induced by a uniaxial load. A pointed indenter produces a localized deformation, resulting in a stress (load) gradient in the specimen. As a result, the transformation of phases in SMAs induced by an indenter can only be partially completed. The overall modulus of the SMAs varies continuously with the indentation load (depth) as the average volumetric fraction of the martensite phase varies. For NiTi (Ea > Em), the modulus decreases with the depth, while for NiTiHf (Ea < Em), the modulus increases with the depth. The predicted young modules during indentation modeling agree well with experimental results. Finally, the phase transformation of the SMAs under the indenter is not affected by the post-yield behavior of the materials.

show abstract

On the phase transformation and dynamic stress–strain partitioning of ferrous medium-entropy alloy using experimentation and finite element method

Cited by 24 publications

References 71 publications

Effect of Extrusion Ratio in Hot-Extrusion on Kink Deformation during Compressive Deformation in an αMg/LPSO Dual-Phase Magnesium Alloy Monitored by <i>In Situ</i> Neutron Diffraction

Effect of Extrusion Ratio in Hot-Extrusion on Kink Deformation during Compressive Deformation in an αMg/LPSO Dual-Phase Magnesium Alloy Monitored by <i>In Situ</i> Neutron Diffraction

Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Load-induced local phase transformation and modulus of shape memory alloys under spherical indentation by finite element method

Contact Info

Product

Resources

About