Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys

Laplanche, G.; Berglund, S.; Reinhart, C.; Kostka, A.; Fox, F.; George, E. P.

doi:10.1016/j.actamat.2018.09.040

Title: Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys

Abstract

Although the phase stability of high-entropy alloys in the Cr-Mn-Fe-Co-Ni system has received considerable attention recently, knowledge of their thermodynamic equilibrium states and precipitation kinetics during high-temperature exposure is limited. In the present study, an off-equiatomic Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄ high-entropy alloy was solutionized and isothermally aged at temperatures between 600 °C and 1000 °C for times to 1000 h. In the original single-phase fcc matrix, an intermetallic σ phase was found to form at all investigated temperatures. Its morphology and composition were determined and the precipitation kinetics analyzed using the Johnson-Mehl-Avrami-Kolmogorov equation and an Arrhenius type law. From these analyses, a time-temperature-transformation diagram (TTT diagram) is constructed for this off-equiatomic alloy. We combine our findings with theories of precipitation kinetics developed for traditional polycrystalline fcc alloys to calculate a TTT diagram for the equiatomic CrMnFeCoNi HEA. The results of our investigation may serve as a guide to predict precipitation kinetics in other complex alloys in the Cr-Mn-Fe-Co-Ni system.

Authors:

; Berglund, S.; Reinhart, C.; Kostka, A.; Fox, F.; George, E. P.

Publication Date:: 2018-12-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ruhr Univ., Bochum (Germany)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG)

OSTI Identifier:: 1474747

Alternate Identifier(s):: OSTI ID: 1479735

Grant/Contract Number:: AC05-00OR22725; LA 3607/1-1; GE 2736/1-1

Resource Type:: Published Article

Journal Name:: Acta Materialia

Additional Journal Information:: Journal Name: Acta Materialia Journal Volume: 161 Journal Issue: C; Journal ID: ISSN 1359-6454

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; high entropy alloys; CoCrFeMnNi; microstructure; TTT diagram; Johnson–Mehl–Avrami (JMA) equation

Citation Formats


                    Laplanche, G., Berglund, S., Reinhart, C., Kostka, A., Fox, F., and George, E. P.. Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys.  United States: N. p., 2018. 
Web.  doi:10.1016/j.actamat.2018.09.040.

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                    Laplanche, G., Berglund, S., Reinhart, C., Kostka, A., Fox, F., & George, E. P.. Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys.  United States.  https://doi.org/10.1016/j.actamat.2018.09.040

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                    Laplanche, G., Berglund, S., Reinhart, C., Kostka, A., Fox, F., and George, E. P.. Sat .  
"Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys".  United States.  https://doi.org/10.1016/j.actamat.2018.09.040.

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@article{osti_1474747,

  title        = {Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys},

  author       = {Laplanche, G. and Berglund, S. and Reinhart, C. and Kostka, A. and Fox, F. and George, E. P.},

  abstractNote = {Although the phase stability of high-entropy alloys in the Cr-Mn-Fe-Co-Ni system has received considerable attention recently, knowledge of their thermodynamic equilibrium states and precipitation kinetics during high-temperature exposure is limited. In the present study, an off-equiatomic Cr26Mn20Fe20Co20Ni14 high-entropy alloy was solutionized and isothermally aged at temperatures between 600 °C and 1000 °C for times to 1000 h. In the original single-phase fcc matrix, an intermetallic σ phase was found to form at all investigated temperatures. Its morphology and composition were determined and the precipitation kinetics analyzed using the Johnson-Mehl-Avrami-Kolmogorov equation and an Arrhenius type law. From these analyses, a time-temperature-transformation diagram (TTT diagram) is constructed for this off-equiatomic alloy. We combine our findings with theories of precipitation kinetics developed for traditional polycrystalline fcc alloys to calculate a TTT diagram for the equiatomic CrMnFeCoNi HEA. The results of our investigation may serve as a guide to predict precipitation kinetics in other complex alloys in the Cr-Mn-Fe-Co-Ni system.},

  doi          = {10.1016/j.actamat.2018.09.040},

  journal      = {Acta Materialia},

  number       = C,

  volume       = 161,

  place        = {United States},

  year         = {2018},

  month        = {12}

}

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Works referencing / citing this record:

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering
journal, December 2019

Alijani, Fatemeh; Reihanian, Mohsen; Gheisari, Khalil
Advanced Engineering Materials, Vol. 22, Issue 4
DOI: 10.1002/adem.201901311

Effect of medium temperature precipitation phase and Mn element diffusion mechanism on high temperature oxidation process of repair and remanufacture CoCrFeMnNi high-entropy alloy cladding
journal, February 2019

Ye, Fuxing; Jiao, Zhipeng; Yang, Yu
Materials Research Express, Vol. 6, Issue 5
DOI: 10.1088/2053-1591/ab01be

Grain boundary decohesion by nanoclustering Ni and Cr separately in CrMnFeCoNi high-entropy alloys
journal, December 2019

Ming, Kaisheng; Li, Linlin; Li, Zhiming
Science Advances, Vol. 5, Issue 12
DOI: 10.1126/sciadv.aay0639

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Title: Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys

Abstract

Citation Formats

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering journal, December 2019

Effect of medium temperature precipitation phase and Mn element diffusion mechanism on high temperature oxidation process of repair and remanufacture CoCrFeMnNi high-entropy alloy cladding journal, February 2019

Grain boundary decohesion by nanoclustering Ni and Cr separately in CrMnFeCoNi high-entropy alloys journal, December 2019

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering
journal, December 2019

Effect of medium temperature precipitation phase and Mn element diffusion mechanism on high temperature oxidation process of repair and remanufacture CoCrFeMnNi high-entropy alloy cladding
journal, February 2019

Grain boundary decohesion by nanoclustering Ni and Cr separately in CrMnFeCoNi high-entropy alloys
journal, December 2019