Experimental determination of latent hardening coefficients in FeMnNiCoCr

Wu, Y.; Bönisch, Matthias; Alkan, S.; Abuzaid, Wael; Şehitoğlu, Hüseyin

doi:10.1016/j.ijplas.2018.02.016

Cited by 49 publications

(14 citation statements)

References 52 publications

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“…This rise in the stress-strain slope is surprising and is to some extent reminiscent of the twinning-induced or martensitic transformation-induced upward stress-strain curvature in TRIP/TWIP steels, Ti- and Cu-alloys 15 , 16 , 18 , 20 , 21 , 32 – 34 . As will be shown later in this paper, deformation twinning indeed takes place in the fcc dendrites, providing a highly effective way for strain-hardening compared to slip-based mechanisms 30 . It is furthermore important to mention that the 〈001〉 fcc -oriented FeCoCrNiAl 0.5 exhibits promising ductility in tension.…”

Section: Resultsmentioning

confidence: 68%

“…In light of previous studies evidencing deformation twinning in FeCoCrNiAl x and FeCoCrNiMn at cryogenic temperature (77K) 3 , 4 , 24 , 30 , 31 the macroscopic compressive stress-strain response of 〈001〉 fcc -oriented FeCoCrNiAl 0.5 was recorded both at 293K and 77K (Fig. 4 ).…”

Section: Resultsmentioning

confidence: 81%

“…5b ) of room temperature deformation. In contrast to single crystals 3 , 30 , at low total strain distinct macroscopic deformation bands are absent and strain is distributed rather homogeneously across the specimen in both fcc and bcc/B2 phases, as shown by the example in Fig. 5a .…”

Section: Resultsmentioning

confidence: 90%

“…Primary twins not only exhibit the outstanding capacity to strongly harden secondary (latent) systems, be they of slip or twin character, but to harden themselves even more. A very recent study 30 has shown that the slip and twin contributions on the macroscopic hardening rate (d σ /dε) differ substantially. It was demonstrated that the self-hardening of twin systems in FeMnCoCrNi single crystals is ~20 times larger than the hardening of latent slip by twin and 50–100 times larger than the self and latent hardening of slip systems among each other.…”

Section: Discussionmentioning

confidence: 99%

“…For example, the maximum stress level can reach 3 GPa and strain level ~25% in a AlCoCrFeNiTi 0.5 alloys consisting of both bcc matrix and disordered bcc Widmanstätten phase 7 .

Figure 1 Comparison of stress-strain behavior of single phase fcc and bcc vs. dual-phase HEAs 2 , 6 , 7 , 9 , 13 , 14 , 30 , 38 , 47 , 48 . Curves shown are compressive unless otherwise stated.…”

Section: Introductionmentioning

confidence: 99%

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Twinning-induced strain hardening in dual-phase FeCoCrNiAl0.5 at room and cryogenic temperature

Bönisch

Şehitoğlu

2018

Sci Rep

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A face-centered-cubic (fcc) oriented FeCoCrNiAl0.5 dual-phase high entropy alloy (HEA) was plastically strained in uniaxial compression at 77K and 293K and the underlying deformation mechanisms were studied. The undeformed microstructure consists of a body-centered-cubic (bcc)/B2 interdendritic network and precipitates embedded in 〈001〉-oriented fcc dendrites. In contrast to other dual-phase HEAs, at both deformation temperatures a steep rise in the stress-strain curves occurs above 23% total axial strain. As a result, the hardening rate associated saturates at the unusual high value of ~6 GPa. Analysis of the strain partitioning between fcc and bcc/B2 by digital image correlation shows that the fcc component carries the larger part of the plastic strain. Further, electron backscatter diffraction and transmission electron microscopy evidence ample fcc deformation twinning both at 77K and 293K, while slip activity only is found in the bcc/B2. These results may guide future advancements in the design of novel alloys with superior toughening characteristics.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

“…For example, the maximum stress level can reach 3 GPa and strain level ~25% in a AlCoCrFeNiTi 0.5 alloys consisting of both bcc matrix and disordered bcc Widmanstätten phase 7 .

Figure 1 Comparison of stress-strain behavior of single phase fcc and bcc vs. dual-phase HEAs 2 , 6 , 7 , 9 , 13 , 14 , 30 , 38 , 47 , 48 . Curves shown are compressive unless otherwise stated.…”

Section: Introductionmentioning

confidence: 99%

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Twinning-induced strain hardening in dual-phase FeCoCrNiAl0.5 at room and cryogenic temperature

Bönisch

Şehitoğlu

2018

Sci Rep

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Fatigue Behavior of Additively Manufactured IN718 with Columnar Grains

Akram

Mushongera

2020

Adv Eng Mater

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Fatigue failure of polycrystalline materials is often dominated by crack initiation processes, which are strongly influenced by salient features existing in the microstructure. Herein, a crystal plasticity framework based on the finite element method is used to quantitatively assess the mechanistic drivers existing in columnar IN718 polycrystals for fatigue crack nucleation. To that end, microstructurally differing polycrystalline samples are subjected to strain‐controlled cyclic loading at ambient conditions to elucidate the microstructural mechanisms of fatigue damage. 2D grain structures obtained from the cellular automata (CA) simulations of the additive manufacturing of IN718 are utilized to construct representative 3D microstructures for use in computational analyses. A criterion related to the stored energy density (SED) is used to predict the scatter in fatigue crack nucleation life. This criterion presents a unique and consistent approach toward predicting fatigue crack initiation at the microstructural scale. It is demonstrated that SED is necessary and sufficient to drive crack nucleation in low cycle fatigue. The results show that grain boundaries are the preferred crack initiation sites.

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Microstructures and Properties of High‐Entropy Materials: Modeling, Simulation, and Experiments

Fang

Liaw

2020

Adv Eng Mater

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The performances of high‐entropy materials (HEMs), including high‐entropy alloys, high‐entropy ceramics, and high‐entropy polymers, with unique characteristics (high mixing entropy, serious lattice distortion, and short‐range order) determined by experiments are out of the ordinary, such as the excellent mechanical properties. The important research methods on HEMs are briefly introduced from the physical modeling, multiscale simulation, and experiments at various scales. The microstructures (dislocation, twinning, grain boundary, and phase) and performances (mechanical property, physical property, chemical property, optical property, medical property, and irradiation property) are summarized. Future directions of research and development with a focus on modeling and simulation in HEMs are discussed. In the next, HEMs with the unique properties would be promising candidates for industrial applications beyond conventional alloys.

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Experimental determination of latent hardening coefficients in FeMnNiCoCr

Cited by 49 publications

References 52 publications

Twinning-induced strain hardening in dual-phase FeCoCrNiAl0.5 at room and cryogenic temperature

Twinning-induced strain hardening in dual-phase FeCoCrNiAl0.5 at room and cryogenic temperature

Fatigue Behavior of Additively Manufactured IN718 with Columnar Grains

Microstructures and Properties of High‐Entropy Materials: Modeling, Simulation, and Experiments

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