The evolution of the deformation substructure in a Ni-Co-Cr equiatomic solid solution alloy

Miao, Jr‐Ming; Slone, C.E.; Smith, Timothy M.; Niu, Chunyao; Bei, Hongbin; Ghazisaeidi, Maryam; Pharr, George M.; Mills, Michael J.

doi:10.1016/j.actamat.2017.04.033

Cited by 401 publications

(162 citation statements)

References 40 publications

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“…[13]) should deform in a similar way, which is indeed confirmed by experiments [4,13]. Remarkably, these two alloys possess very similar tensile strength and ductility since they both deform by prevalent twinning and their twinnabilities are predicted similar [4,6,13]. Furthermore, from Fig.…”

Section: (I) Route 1 Towards Fm High-co Low-cr Alloys;supporting

confidence: 72%

“…High entropy alloys (HEAs) were originally proposed by Yeh and Cantor in 2004 [1,2] as equiatomic concentrated solid solutions which stabilize the single-phase structure through the maximized configurational entropy. Based on this concept, many types of single-phase HEAs have been successfully developed and some of them have been demonstrated possessing excellent mechanical properties, including CrCoNi medium entropy alloy (MEA) [3,4], CrFeCoNi [5,6] and CrMnFeCoNi [2,7] HEAs. Besides the effect of mixing entropy, studies have focused on the chemical effect on the phase stability [8].…”

Section: Introductionmentioning

confidence: 99%

“…Following this idea, they have designed TRIP or TWIP assisted single-and dual-phase HEAs with intriguing mechanical properties in Cr-Mn-Fe-Co alloys [9,12]. In fact, equiatomic MEAs/HEAs such as CrCoNi and CrMnFeCoNi are also strengthened by the TRIP and/or TWIP effects [3,4,7]. In particular, the CrCoNi MEA exhibits extraordinary combination of high strength, high ductility and high fracture toughness [3,4], superior to CrMnFeCoNi and any other investigated ternary or quaternary equiatomic variants.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: (I) Route 1 Towards Fm High-co Low-cr Alloys;supporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Furthermore, it is known that multiple-principal-element CoCrNibase alloys have stacking fault energy of 20∼30 mJ m −2 , which are significantly higher than that of pure Co (0 mJ m −2 ) at room temperature and cryogenic temperature [27,28]. The higher SFE promotes the activation of prismatic 〈a〉-type dislocations and restrains the occurrence of deformation twinning, as shown by previous research [26].…”

Section: Discussionmentioning

confidence: 73%

“…This kind of HCP phase (ε-martensite) were compositional sample and contain low levels of secondary elements. However, in this study, the transformed HCP phase was multicomponent owing to the 'high-entropy' effect, making it possible to deform in a ductile style by activating more slip systems (basal 〈a〉 dislocations and prismatic 〈a〉-type dislocations), as shown in the literature [26]. Furthermore, it is known that multiple-principal-element CoCrNibase alloys have stacking fault energy of 20∼30 mJ m −2 , which are significantly higher than that of pure Co (0 mJ m −2 ) at room temperature and cryogenic temperature [27,28].…”

Section: Discussionmentioning

confidence: 76%

Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures

Huo

Chang

et al. 2020

Mater. Res. Express

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In the present study, a Co-rich CoCrNi-AlTi high-entropy alloy was designed and fabricated by hot forging and 700°C for 8 h annealing process. The microstructure of the resultant alloy was composed of three multicomponent-phases with the face-centered cubic (FCC) structure, hexagonal closepacked (HCP) structure and L1 2 structure, respectively. The alloy exhibited a remarkable combination of tensile yield strength (gigapascal scale) and plasticity (uniform strain over 30%) at both room and cryogenic temperatures. The cooperative operation of multiple mechanisms consisting of refinedgrain strengthening, second-phase strengthening, precipitation strengthening, stacking faults and phase-transformation toughening was suggested to be responsible for the excellent mechanical response.

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Numerical Simulation of Cold Spray Bonding for CrFeNi Medium‐Entropy Alloy

et al. 2022

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As a solid‐state deposition, cold spray maintains the intrinsic characteristics of the feedstock powder. Thus, it provides a unique opportunity for depositing high‐entropy alloys (HEAs) and medium‐entropy alloys (MEAs) that are of great interest for coatings to protect vulnerable materials from aggressive environments. However, considering the high hardness and the complexity of these powder's preparation, the choice of deposition parameters through experiments can be challenging and costly. Herein, a finite element model is presented to simulate the deposition of CrFeNi MEA using cold spray technology. A detailed approach is implemented to model the bonding of the particle to the substrate. The model is able to identify the deposition velocity window and simulate the metallurgical and mechanical interlocking. The particle adheres to the substrate at 500 m s−1 and pushes the substrate down facilitating mechanical interlocking. Furthermore, due to the strain localization induced by the particle, a notable temperature increase is observed at the substrate surface raising to its melting point in agreement with the ejecta eruption phenomenon. The developed numerical method can pave the way for successful experiments in case of costly HEAs and MEAs powders.

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The evolution of the deformation substructure in a Ni-Co-Cr equiatomic solid solution alloy

Cited by 401 publications

References 40 publications

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

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

Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures

Numerical Simulation of Cold Spray Bonding for CrFeNi Medium‐Entropy Alloy

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