A theoretical calculation of stacking fault energy of Ni alloys: The effects of temperature and composition

Dodaran, M.; Guo, Shengmin; Khonsari, M. M.; Shamsaei, Nima

doi:10.1016/j.commatsci.2021.110326

Cited by 31 publications

(5 citation statements)

References 68 publications

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“…Therefore, the relatively high σ 0 can be traced to the large solid solution strengthening, which is specially a consequence of the higher concentration of Cr in the alloy, as shown by Coury et al [20]. Additionally, Cr tends to decrease the stacking fault energy of the alloy [13,41,42], what could provide the formation of more annealing twins [43][44][45] that act as barriers to the movement of dislocations, increasing the yield strength and the term σ 0 [46,47] .…”

Section: Discussionmentioning

confidence: 97%

A Hall–Petch study of the high toughness Cr40Co30Ni30 multi-principal element alloy

Puosso

Bertoli

Coury

2022

Journal of Materials Research

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Multi-principal element alloys (MPEAs) are an emergent class of metallic materials that displays a huge range of possible properties and applications. CrCoNi MPEAs attract great interest because they show good strength–ductility combinations, especially in Cr-rich non-equiatomic compositions. In this work, the Cr40Co30Ni30 MPEA was produced and characterized at different annealing conditions. This alloy displays a great strength–ductility balance, evidenced by the high uniform deformation (55–70%) and high estimated toughness. It also exhibits high strengthening by grain refining, given by the high Hall–Petch slope (k = 655 MPa/μm−0.5). The grain growth kinetics analysis provides estimates that can aid the design and processing of this alloy for future applications. Deformed samples displayed both TWIP and TRIP effects, once mechanical twins and HCP martensitic phase, arranged in nanometric lamellae, are formed during straining, greatly increasing the number of interfaces in the microstructure and providing good mechanical properties in tension. Graphical abstract

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Section: Discussionmentioning

confidence: 97%

A Hall–Petch study of the high toughness Cr40Co30Ni30 multi-principal element alloy

Puosso

Bertoli

Coury

2022

Journal of Materials Research

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“…The choice of composition aims to achieve a balance between ductility and strength. Vanadium effectively enhances strength in Ni-based alloys [33] while the incorporation of Co into Ni decreases the SFE [34], promoting the formation of SFs and deformation twins. Figure 2b presents the HEXRD profiles of the selected alloy subjected to various recrystallization heat treatments.…”

Section: Microstructurementioning

confidence: 99%

Tensile Properties of a Non-Equiatomic Ni–Co–V Medium Entropy Alloy at Cryogenic Temperature

Zhou,

Shi,

Wang

et al. 2024

Metals

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The development of strong and ductile alloys for application in cryogenic temperatures has long been sought after. In this work, we have developed a face-centered cubic Ni10Co56.5V33.5 multi-principal element alloy (MPEA) that exhibits a balanced combination of high strength and good ductility at 77 K, based on the considerations of large local lattice distortion (LLD) and low stacking fault energy. The small-grained Ni10Co56.5V33.5 MPEA exhibits a yield strength of 1400 MPa and an ultimate tensile strength of 1890 MPa, while preserving a good ductility of 23%. Moreover, precession electron diffraction and transmission electron microscopy revealed multiple deformation mechanisms, including wavy dislocations, atypically severely twisted dislocation bands, hierarchical stacking faults, and deformation twins, which are implicated in the alloy’s outstanding mechanical performance. These insights offer a strategic guide for the design of strong and ductile alloys, particularly for utilization in extreme environments.

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“…Coatings 2024, 14, x FOR PEER REVIEW 6 of 11 deformation mechanism of FCC metals and alloys is greatly affected by the stacking fault energy. For this as-cast Ni-W-Co-Ta MHA, although there are no relevant research results to illustrate the extent of its lamination fault energy, some studies have shown that adding W and Co elements to a Ni matrix can effectively reduce the lamination fault energy of pure Ni [32][33][34][35]. In addition, the microalloying process of Co and Ta elements in the alloy also resulted in the formation of short-range ordered structures inside the material [36], which are the prerequisites for the formation of plane slipping in the as-cast Ni-W-Co-Ta MHA.…”

Section: Transmission Electron Microscopy Analysis Of the Microstructurementioning

confidence: 99%

High-Temperature Tensile Behavior of an As-Cast Ni-W-Co-Ta Medium–Heavy Alloy

Li,

Xiong,

Tang

et al. 2024

Coatings

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High-temperature tensile experiments with tensile rates ranging from 0.01 s−1 to 10 s−1 were carried out at various temperatures ranging from 1000 °C to 1250 °C with a Gleeble-3800 thermal simulation tester to evaluate the physical properties of an as-cast Ni–W–Co–Ta medium–heavy alloy. The microstructure evolution of the alloy during high-temperature stretching was characterized by metallographic microscopy, scanning electron microscopy, and transmission electron microscopy. The results indicated the emergence of multiple slip lines and the parallel arrangement of dislocations in the grain of the alloy after high-temperature stretching, and typical characteristics of plane slipping were observed. The plasticity of the Ni–W–Co–Ta medium–heavy alloy increased, but its strength decreased with an increase in the deformation temperature. In contrast, an increase in the strain rate resulted in a noticeable increase in the strength and plasticity of the medium–heavy alloy. The experiments revealed that the maximum tensile strength of the as-cast Ni–W–Co–Ta medium–heavy alloy was 735 MPa (T = 1000 °C, ε˙ = 10 s−1). Additionally, the maximum reduction in area and elongation was 38.1% and 11.8% (T = 1250 °C, ε˙ = 10 s−1), respectively. The mode of fracture after high-temperature tensile deformation was brittle fracturing.

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A theoretical calculation of stacking fault energy of Ni alloys: The effects of temperature and composition

Cited by 31 publications

References 68 publications

A Hall–Petch study of the high toughness Cr40Co30Ni30 multi-principal element alloy

A Hall–Petch study of the high toughness Cr40Co30Ni30 multi-principal element alloy

Tensile Properties of a Non-Equiatomic Ni–Co–V Medium Entropy Alloy at Cryogenic Temperature

High-Temperature Tensile Behavior of an As-Cast Ni-W-Co-Ta Medium–Heavy Alloy

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