Microstructural evolution and mechanical performance of carbon-containing CoCrFeMnNi-C high entropy alloys

Ko, Jun Yeong; Hong, Sun Ig

doi:10.1016/j.jallcom.2018.01.348

Cited by 122 publications

(47 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, interstitial alloying with elements like carbon can efficiently increase the strength of 3d transition metal fcc HEAs without considerable loss in ductility; mostly due to a strong solid-solution strengthening effect [9,[35][36][37][38][39][40][41][42][43][44][45]. In addition, carbon can change the contributions of operating deformation mechanisms due to stackingfault energy (SFE) changing.…”

Section: Introductionmentioning

confidence: 99%

“…Much smaller attention has been paid so far to precipitation hardening of HEAs by fine carbide particles. For example, Cr-rich M 23 C 6 /M 7 C 3 carbides can be found in Co-Cr-Fe-Ni-Mn system HEAs in as-cast, heat treated, and thermo-mechanically processed conditions [9,35,42]; yet in most cases the reported carbide particles were coarse and did not result in noticeable strengthening [36,42,46].…”

Section: Introductionmentioning

confidence: 99%

“…The program alloy was produced by the self-propagating high-temperature synthesis method (SHS) [14,32,47]. Annealing of the cold-rolled alloy was carried in a temperature range of 973-1373 K, which, according to previous results [20,22,35,36,38,42,48], could lead to recrystallization of the fcc matrix and/or precipitation of carbide particles. Detailed microstructural investigations and tensile testing of the annealed alloy were performed, and links between the microstructure parameters and mechanical properties of the alloy were established.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Recrystallized microstructures and mechanical properties of a C-containing CoCrFeNiMn-type high-entropy alloy

Klimova

Shaysultanov

Chernichenko

et al. 2019

Materials Science and Engineering: A

View full text Add to dashboard Cite

The effect of cold rolling to 80% thickness reduction and annealing at 973-1373 K for 1 h on the microstructure and mechanical properties of a C-containing CoCrFeNiMn high-entropy alloy was studied. Cold rolling significantly strengthened the alloy to the yield strength of 1310 MPa. Annealing at 973 K or 1073 K resulted in incomplete recrystallization of an fcc matrix and M 23 C 6-type carbide precipitations aligned with highly elongated grains/subgrains. Complete recrystallization occurred during annealing at 1173 − 1373 K. The ordered arrangement of the carbides was not observed after annealing at 1273 K or 1373 K. The volume fraction of carbides decreased with increasing the annealing temperature that can be reasonably described by a Thermo-Calc prediction. The coarsening behavior of the microstructure constituents was studied during isothermal annealing at 1173 K for 1-50 h. It was found that the grain growth and the particle coarsening can be expressed by power law functions of annealing time with grain/particle size exponents of about 2 and 3, respectively. An increase in the annealing temperature from 973 K to 1373 K led to a gradual softening of the alloy; the yield strength decreased from 870 MPa to 320 MPa, whereas total elongation increased from 24% to 47%, respectively. Contributions of various strengthening mechanisms into the overall strength of the alloy were discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recrystallized microstructures and mechanical properties of a C-containing CoCrFeNiMn-type high-entropy alloy

Klimova

Shaysultanov

Chernichenko

et al. 2019

Materials Science and Engineering: A

View full text Add to dashboard Cite

show abstract

“…4. The higher oxygen content revealed by EDS spectra from crack initiation site suggests that the higher oxygen content due to the reduction of Fe 2 O 3 by Zr and dissolution of oxygen into matrix is responsible for the low deformability It is interesting to note that the strength increases with increasing fraction of scrap, which can be attributed to the increase of oxygen content [11], [12]. The ductility decreased slightly with increase of scrap fraction.…”

Section: Resultsmentioning

confidence: 96%

“…The addition oxygen is known to increase the stability of hexagonal α phase, causing the reduction of the thickness due to enhanced nucleation of α phase [8]- [10]. Interstitial atoms such as oxygen [8]- [10] and carbon [11], [12] are known to increase the strength of Ti and Zr, but it decreases the deformability and ductility if the oxygen content exceeds 1800 ppm [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Recycling Zr-Nb-Sn-Fe Scrap in Casting of Nuclear-Grade Alloy Ingots and Its Effects on Mechanical Performance and Integrity

Song¹,

Hong²

2020

IJESD

Self Cite

View full text Add to dashboard Cite

Recycling of Zr-Nb-Sn-Fe scraps in casting enhances the price competitiveness of nuclear-grade Zr alloys and accordingly the energy from nuclear power plants. Increasing the fraction of scrap in casting of new alloy ingots increases the price competitiveness, but it aggravates the deformability and mechanical reliability of cast alloys. In this study, the effect of scrap ratio on the mechanical reliability of Zr-Nb-Sn-Fe alloys was studied. The increase of scrap fraction in casting increases the oxygen content in the ingot and nuclear claddings fabricated from cast ingots. The increase of oxygen content is caused by the surface oxide of scraps such as small pieces of turning, chips, etc. Iron content was not found to increase appreciably with the increasing fraction of scrap because scraps were well kept in the iron-free container. The microstructure of ss-cast Zr alloy with increasing fraction of scraps displayed plate/or needle α phase and the microstructural features were observed to be affected by increase of scrap fraction. The strength increases with increasing fraction of scrap, which can be attributed to the increase of oxygen content. The ductility decreased slightly with increase of scrap fraction. The strength increased at the expense of ductility with increase of scrap fraction. In some ingots, iron oxide flakes were intentionally added to explore the effects of iron oxide which may be added from the scarp storage container. The alloys with the addition of iron oxide flakes exhibited the drastic decrease of the formability and exhibited the brittle fracture behavior during rolling. The increase of oxide fraction increased the oxidation resistance because of high oxygen content the matrix may have prevented oxygen diffusion into matrix.

show abstract

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

et al. 2023

View full text Add to dashboard Cite

High‐ and medium‐entropy alloys (HEAs/MEAs), also called as multicomponent alloys, are a new class of materials that break through the traditional alloy design concept based on single principal element. However, they do not break away from the magic spell of strength–ductility trade‐off. Therefore, designing HEAs/MEAs with both high strength and high ductility still remains a great challenge nowadays. This article provides a review on the recent progress in mechanical properties of face‐centered cubic (FCC) HEAs/MEAs. First, several traditional strengthening strategies are briefly reviewed, focusing on the strengthening mechanisms and the optimized mechanical properties. Subsequently, various novel strategies for achieving strength–ductility synergy in HEAs/MEAs are summarized, which include lowering the stacking fault energy, regulating the short‐range order, promoting transformation‐induced plasticity, and constructing heterogeneous microstructures. The basic ideas and related underlying mechanisms from these strategies are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In brief, the present review is expected to provide a useful guide for the design of HEAs/MEAs with superior mechanical properties.

show abstract

Microstructural evolution and mechanical performance of carbon-containing CoCrFeMnNi-C high entropy alloys

Cited by 122 publications

References 48 publications

Recrystallized microstructures and mechanical properties of a C-containing CoCrFeNiMn-type high-entropy alloy

Recrystallized microstructures and mechanical properties of a C-containing CoCrFeNiMn-type high-entropy alloy

Recycling Zr-Nb-Sn-Fe Scrap in Casting of Nuclear-Grade Alloy Ingots and Its Effects on Mechanical Performance and Integrity

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

Contact Info

Product

Resources

About