Microstructure and mechanical properties of CoCrNi-Mo medium entropy alloys: Experiments and first-principle calculations

Chang, Ruobin; Fang, Wei; Yan, Jun; Yu, Haoyang; Bai, Xi; Li, Jia; Wang, Shiying; Zheng, Shijian; Yin, Fuxing

doi:10.1016/j.jmst.2020.04.062

Cited by 89 publications

(7 citation statements)

References 55 publications

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“…The relatively large local LD in CoCrNi was possibly caused by the SRO. In contrast, the stacking fault energy of the CoCrFeNi alloy at RT was 32.5 mJ/m 2 [119] , which was higher than that of the CoCrNi alloy (22 mJ/m 2 ) [32] . Based on the above two aspects, the strengthening effect of Fe was not obvious in the CoCrNi alloy.…”

Section: Substitutional Elements (Al Fe Mo W Cu Nb and Ti)mentioning

confidence: 71%

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.

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Section: Substitutional Elements (Al Fe Mo W Cu Nb and Ti)mentioning

confidence: 71%

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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“…Respectively, indicating that the addition of C increased the CuCrWNi pseudo energy gap and decreased the CuCrWMo, CuCrWAl alloy pseudo energy gap. When the pseudo energy gap is smaller, the more metallic the system is [39], i.e., the more ductile the alloy system is, the more conducive to processing and molding. The above is consistent with the previous analysis of the mechanical properties, which may be the reason for the different variations in the mechanical properties of the alloy.…”

Section: Resultsmentioning

confidence: 99%

First‐Principles Calculations for the Enhancement of Mechanical Properties of High‐Entropy Alloys by Carbon Elements

Ding

Feng

Yuan

2023

IEEJ Transactions Elec Engng

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A series of alloy solid solution models were developed using the SQS modeling method, and the effect of C doping on the phase structure, elastic properties, and electronic structure of the alloys was investigated using a first‐principles approach. The results showed that the CuCrWNi (C), CuCrWMo (C), and CuCrWAl (C) alloys all have a single body‐centered cubic (BCC) structure. The alloys conformed to the mechanical stability criterion before and after incorporating C. The incorporation of C leads to an increase in the bulk modulus B of the CuCrWNi, CuCrWAl alloy, and the Young's modulus E and shear modulus G of the CuCrWMo, CuCrWAl alloy. In comparison, the shear modulus G and Young's modulus E of CuCrWNi alloy and the bulk modulus B of CuCrWMo alloy show a decreasing tendency. The alloy is ductile before and after the addition of C. The addition of C increased the Poisson's ratio, Pugh ratio, and Cauchy pressure of CuCrWNi alloy and decreased the Poisson's ratio, Pugh ratio, and Cauchy pressure of CuCrWMo and CuCrWAl. This shows that adding C improves the ductility of CuCrWNi and the strength of CuCrWMo and CuCrWAl alloys. By analyzing the electronic structure of the alloys, it was found that the doping of C made the alloy less stable. Adding C makes the high‐entropy alloys more conducive and the metallic properties more noticeable. Moreover, the incorporation of C makes the CuCrWNi pseudo‐energy gap decrease and the CuCrWMo, and CuCrWAl pseudo‐energy gap increase, which may be related to the change in the mechanical properties of the alloy. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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“…In the process of research, it is found that there are a number of factors that can affect SFE. Among them, the chemical composition is the most significant factor, and small changes in the constituent elements and their concentrations can cause huge changes in SFE [74]. Interestingly, SFE is found to have a weak dependence on the number of elements in the alloy system.…”

Section: Sfe Calculationmentioning

confidence: 99%

A brief review of metastable high-entropy alloys with transformation-induced plasticity

Zhang

Fang

et al. 2020

Materials Science and Technology

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In metastable high-entropy alloys (HEAs), the decrease of phase stability enables the development of dual-phase microstructure (interface hardening) and occurrence of strain-induced martensitic transformation (transformation-induced hardening), which overcomes the strength–ductility trade-off. The stacking-fault energy (SFE) is closely related to the phase stability and plays a key role in controlling the underlying deformation mechanism and hence the mechanical performance of HEAs. Here, we review some approaches of SFE calculation, including theoretical and experimental methods as well as the factors affecting SFE. Several compositional systems related to metastable HEAs are also briefly reviewed. Furthermore, we show the unique microstructure and the structure–property relationship of the metastable HEAs. Furthermore, some potential research topics in the future are also proposed.

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Microstructure and mechanical properties of CoCrNi-Mo medium entropy alloys: Experiments and first-principle calculations

Cited by 89 publications

References 55 publications

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

First‐Principles Calculations for the Enhancement of Mechanical Properties of High‐Entropy Alloys by Carbon Elements

A brief review of metastable high-entropy alloys with transformation-induced plasticity

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