Stacking fault energy of face-centered-cubic high entropy alloys

Liu, Shaofei; Wu, Yuhang; Wang, H.T.; He, Junyang; Liu, J.B.; Chen, C.X.; Liu, X.J.; Wang, H.

doi:10.1016/j.intermet.2017.10.004

Cited by 379 publications

(111 citation statements)

References 27 publications

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“…(ii) The SFE is sufficiently low so that SFs can start at an immediate step before serrations. The experimental values of SFE at room temperature for CrMnFeCoNi, CrFeCoNi, and CrCoNi are 30 ± 5 mJ/m 2 (29), 27 ± 4 mJ/m 2 (32), and 22 ± 4 mJ/m 2 (30), respectively. These values can be compared with the SFE of Ni (the only fcc element in these alloys), which is 125 ± 5 mJ/m 2 (37).…”

Section: Discussionmentioning

confidence: 94%

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Cooperative deformation in high-entropy alloys at ultralow temperatures

et al. 2020

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High-entropy alloys exhibit exceptional mechanical properties at cryogenic temperatures, due to the activation of twinning in addition to dislocation slip. The coexistence of multiple deformation pathways raises an important question regarding how individual deformation mechanisms compete or synergize during plastic deformation. Using in situ neutron diffraction, we demonstrate the interaction of a rich variety of deformation mechanisms in high-entropy alloys at 15 K, which began with dislocation slip, followed by stacking faults and twinning, before transitioning to inhomogeneous deformation by serrations. Quantitative analysis showed that the cooperation of these different deformation mechanisms led to extreme work hardening. The low stacking fault energy plus the stable face-centered cubic structure at ultralow temperatures, enabled by the high-entropy alloying, played a pivotal role bridging dislocation slip and serration. Insights from the in situ experiments point to the role of entropy in the design of structural materials with superior properties.

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Section: Discussionmentioning

confidence: 94%

“…Because of the favorable composition, the SFE in these HEAs is low (29,30,32), thereby allowing a transition from deformation by full dislocations to partials with SFs and twinning (28,33). As the neutron diffraction data demonstrated, the critical strain for SF decreases nearly linearly with temperature.…”

Section: Discussionmentioning

confidence: 99%

Cooperative deformation in high-entropy alloys at ultralow temperatures

et al. 2020

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“…As shown in Fig. 12, 45 Ni plays an important role in the SFE of the alloys, i.e., the SFE increases with increasing the Ni content. They thought that the composition dependence of SFE in the HEA is due to the high SFE of Ni, which substitutes other elements with the low SFE, boosting the SFE of the whole alloy.…”

Section: Stacking Fault Energymentioning

confidence: 91%

“…Liu et al 45 measured the SEF of the FeCoNiCrMn HEA system with the samples fabricated by arc melting, homogenizing at 1473 K for 10 h, and cold rolling with a reduction of 35% in thickness. The equation that they utilized to determine the SFE is described as 46…”

Section: Stacking Fault Energymentioning

confidence: 99%

Fundamental understanding of mechanical behavior of high-entropy alloys at low temperatures: A review

et al. 2018

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The basic principle of high-entropy alloys (HEAs) is that high mixing entropies of solid-solution phases enhance the phase stability, which renders us a new strategy on alloy design. The current research of HEAs mostly emphasizes mechanical behavior at room and higher temperatures. Relatively fewer papers are focused on low-temperature behaviors, below room temperature. However, based on the published papers, we can find that the low-temperature properties of HEAs are generally excellent. The great potential for cryogenic applications could be expected on HEAs. In this article, we summarized and discussed the mechanical behaviors and deformation mechanisms, as well as stacking-fault energies, of HEAs at low temperatures. The comparison of low-temperature properties of HEAs and conventional alloys will be provided. Future research directions will be suggested at the end.

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“…Here [24], -24 mJ/m 2 [27] and -43 mJ/m 2 [18]. We mention here that one should not directly compare the theoretical SFE with the experimental values, e.g., 18±4 mJ/m 2 [62] and 22±4 mJ/m 2 [63]. The latter ones are usually calculated based on the measured partial dislocation separations ( ) using the transmission electron microscopic (TEM) method according…”

Section: Stacking Fault Energymentioning

confidence: 99%

Designing Transformation-Induced Plasticity and Twinning-Induced Plasticity Cr-Co-Ni Medium Entropy Alloys: Theory and Experiment

Yang

Tian

et al. 2020

SSRN Journal

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In order to efficiently explore the nearly infinite composition space in multicomponent solid solution alloys, it is important to establish predictive design strategies and use computation-aided methods. In the present work, we demonstrated the density functional theory calculations informed design routes for realizing transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) in Cr-Co-Ni medium entropy alloys (MEAs). We systematically studied the effects of magnetism and chemical composition on the generalized stacking fault energy surface (-surface) and showed that both chemistry and the coupled magnetic state strongly affect the -surface, consequently, the primary deformation modes. Based on the calculated effective energy barriers for the competing deformation modes, we constructed composition and magnetism dependent deformation maps at both room and cryogenic temperatures. Accordingly, we proposed various design routes for achieving desired primary deformation modes in the ternary Cr-Co-Ni alloys. The deformation mechanisms predicted by our theoretical models are in nice agreement with available experimental observations in literature. Furthermore, we fabricated two non-equiatomic Cr-Co-Ni MEAs possessing the designed TWIP and TRIP effects, showing excellent combinations of tensile strength and ductility. Corresponding authors: a Song Lu, songlu@kth.se b Yanzhong Tian,

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Stacking fault energy of face-centered-cubic high entropy alloys

Cited by 379 publications

References 27 publications

Cooperative deformation in high-entropy alloys at ultralow temperatures

Cooperative deformation in high-entropy alloys at ultralow temperatures

Fundamental understanding of mechanical behavior of high-entropy alloys at low temperatures: A review

Designing Transformation-Induced Plasticity and Twinning-Induced Plasticity Cr-Co-Ni Medium Entropy Alloys: Theory and Experiment

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