Simple Approach to Model the Strength of Solid-Solution High Entropy Alloys in Co-Cr-Fe-Mn-Ni System

Shafiei, Ali

doi:10.1007/s11223-022-00448-6

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…It is also interesting and important to consider the dependence of mechanical properties on the alloy composition. Unfortunately, this is not easy because the mechanical properties in Fe–Co–Ni alloys depend not only on the alloy composition but also on the magnetostriction [45,46]. Here, we would like to focus on the effects in the microstructure including grain size and crystal structure.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and tensile strength of electrodeposited Fe-rich bcc FeCoNi medium-entropy alloys

Watanabe

Yamamoto

Miyamoto

et al. 2023

Materials Science and Technology

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Crystal grain refinement in high- and medium-entropy alloys is an effective approach to obtaining good strength as well as ductility. An FeCoNi medium-entropy alloy with a wide range of grain sizes was fabricated by electrodeposition. The alloy had a metastable bcc structure with Fe–36 at.% Co–21 at.% Ni composition and heterogeneous distribution of grain sizes ranging from 20 nm to 15 µm. Moreover, the alloy possessed a tensile strength of 1.2 GPa, and a fracture elongation of 6.3 % without secondary phase. The excellent mechanical properties of the alloy can be attributed to its bcc phase and heterogeneous grain sizes extending to the nanoscale. GRAPHICAL ABSTRACT

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Section: Resultsmentioning

confidence: 99%

Microstructure and tensile strength of electrodeposited Fe-rich bcc FeCoNi medium-entropy alloys

Watanabe

Yamamoto

Miyamoto

et al. 2023

Materials Science and Technology

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“…На основании экспериментальных данных авторам работы [45] удалось получить полиномное уравнение прочности (твердости) для ВЭС с ГЦК решеткой, содержащих 4 -5 элементов системы сплава Cantor. Важным выводом исследования является утверждение, что с ростом содержания железа прочность пятикомпонентного сплава Cantor снижается.…”

Section: использование программы Calphadunclassified

Ways to improve the properties of high-entropy alloys Cantor CoCrFeNiMn and CoCrFeNiAl

Gromov,

Konovalov,

Efimov

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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Created one of the first and studied more than 20 years ago, high-entropy five-component alloys CoCrFeNiMn (Cantor alloy) and CoCrFeNiAl still attract the attention of researchers in the field of physical materials science due to their possible application in various industries because of their successful combination of strength and plastic properties. To date, a large amount of experimental materials has been accumulated on the ways to control the properties of these alloys. This article reviews the publications of domestic and foreign authors in two areas of improving the properties of these alloys: alloying, precipitation and heat treatment, and the use of CALPHAD phase diagrams. In the first direction, the role of alloying with B, Al, V, Si, Nb is analyzed; γ and γ′ nanoprecipitations, various modes of thermal and deformation processing. It was concluded that it is necessary to conduct experiments on the alloying of HEAs with Zr and Nb, which have proven themselves well in hardening steels. Creation and modification of the properties of five-component HEAs is possible using the CALPHAD computer programs developed for calculating state diagrams. The results of publications on the thermodynamic description of five-component alloys analyzed in the article are confirmed by comparing the phase diagrams with the available experimental data. In one of the analyzed works on the phase formation of five-component HEAs consisting of Co, Cr, Fe, Ni, Al, Mn, Cu, 2436 compositions were considered, which made it possible to determine 1761 variants of reliable prediction of the formation of bcc/B2 and fcc phases, bypassing amorphous phases and intermetallic compounds, thereby designing a certain level of mechanical properties. It is shown that the design of a new generation of HEAs is possible based on calculation of the CALPHAD phase diagrams.

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Oxidation Behavior and Creep Resistance of Cast MC-Strengthened CoNiFeMnCr HEAs at 1100 °C

Berthod,

Aranda

2024

Micro

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The reinforcement of cast Cantor’s-type high-entropy alloys by MC carbides and their effect on the hot oxidation behavior were investigated. Three equimolar CoNiFeMnCr alloys without or with carbon and with either hafnium or tantalum were elaborated. Their as-cast microstructures were specified. Oxidation tests were carried out in air at 1100 °C. Flexural creep tests were performed at 1100 °C at 10 MPa. The carbide-free CoNiFeMnCr alloy was single-phased. The version with Hf and C added and the one with Ta and C added contained interdendritic eutectic script HfC and TaC carbides, respectively. After oxidation for 50 h at 1100 °C, all alloys were covered by a (Cr,Mn)2O3 scale with various proportions of Cr and Mn. HfO2 or CrTaO4 also formed. Oxidation resulted in a deep depletion in Cr and in Mn in the subsurface. Oxidation is much faster for the three alloys by comparison with chromia-forming alloys. Their bad oxidation behavior is obviously due to Mn and protection by coating is to be considered. The creep deformation of the carbide-free CoNiFeMnCr alloy was very fast. The creep resistance of the two versions reinforced by either HfC or TaC deformed much slower. The addition of these MC carbides led to a deformation rate divided by five to ten times. Now, creep behavior comparisons with commercial alloys are to be conducted. They will be performed soon.

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Simple Approach to Model the Strength of Solid-Solution High Entropy Alloys in Co-Cr-Fe-Mn-Ni System

Cited by 3 publications

References 44 publications

Microstructure and tensile strength of electrodeposited Fe-rich bcc FeCoNi medium-entropy alloys

Microstructure and tensile strength of electrodeposited Fe-rich bcc FeCoNi medium-entropy alloys

Ways to improve the properties of high-entropy alloys Cantor CoCrFeNiMn and CoCrFeNiAl

Oxidation Behavior and Creep Resistance of Cast MC-Strengthened CoNiFeMnCr HEAs at 1100 °C

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