Elemental segregation to lattice defects in the CrMnFeCoNi high-entropy alloy during high temperature exposures

Heczko, Milan; Mazanova, Veronika; Groger, Roman; Zalezak, Tomas; Hooshmand, Mohammad S.; George, Easo P.; Mills, Michael J.; Dlouhy, Antonin

doi:10.1016/j.actamat.2021.116719

Elemental segregation to lattice defects in the CrMnFeCoNi high-entropy alloy during high temperature exposures

Journal Article · Sun Feb 07 00:00:00 EST 2021 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2021.116719· OSTI ID:1860596

Heczko, Milan ^[1]; Mazanova, Veronika ^[1]; Groger, Roman ^[2]; Zalezak, Tomas ^[2]; Hooshmand, Mohammad S. ^[3]; ^[4]; Mills, Michael J. ^[5]; Dlouhy, Antonin ^[2]

Czech Academy of Sciences, Brno (Czech Republic); The Ohio State Univ., Columbus, OH (United States)
Czech Academy of Sciences, Brno (Czech Republic)
Univ. of California, Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States)
The Ohio State Univ., Columbus, OH (United States)

The influence of small plastic pre-strains on the elevated-temperature stability and microstructure of the equiatomic CrMnFeCoNi FCC solid solution is investigated. Particular attention is given to whether any of the alloy elements segregate to individual dislocations. To that end, CrMnFeCoNi samples were first deformed in tension at room temperature to plastic strains of 0.2 and 2.3%, and subsequently annealed at 973 K for 800 hours. The pre-strains activated planar slip of 1/2<110>-type dislocations on {111}-type glide planes. Interactions of this planar slip with special Σ3 grain boundaries formed a large number of dislocation segments with a <110>-type crystallographic orientation suitable for a credible end-on analysis of dislocation cores in HR-STEM. The cores of the 1/2<110> dislocations pushed up against the investigated grain boundaries were found to be close to the compact configuration. Within the sensitivity of the Super-X EDS mapping, no concentration gradient was detected near dislocations that would indicate enrichment at dislocation cores of any of the elemental constituents of the alloy after the pre-deformation and annealing. However, a Cr-rich tetragonal sigma phase nucleated and grew at grain boundary triple junctions during this anneal, processes that were not accelerated by the enhanced dislocation density present after pre-strain. A clear chromium gradient was observed in the Cr-depleted zones near grain boundaries suggesting that Cr transport occurred by relatively slow diffusion from the bulk to the grain boundaries and then by relatively fast diffusion along the grain boundaries to the precipitates. Accompanying the Cr depletion near grain boundaries is a simultaneous Ni and Mn enrichment, which promotes formation of the L1₀ NiMn phase that is observed on the grain boundaries after prolonged annealing.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: CSF; Czechoslovak Microscopy Society; Ministry of Education , Youth and Sports; Nationals Science Foundation (NSF); Thermo Fisher Scientific; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1860596

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: N.A. Vol. 208; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (39)

Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes Yeh, J.-W.; Chen, S.-K.; Lin, S.-J. Advanced Engineering Materials, Vol. 6, Issue 5, p. 299-303 https://doi.org/10.1002/adem.200300567	journal	May 2004
Advanced Scale Bridging Microstructure Analysis of Single Crystal Ni-Base Superalloys: Advanced Scale Bridging Microstructure Analysis … Parsa, Alireza B.; Wollgramm, Philip; Buck, Hinrich Advanced Engineering Materials, Vol. 17, Issue 2 https://doi.org/10.1002/adem.201400136	journal	July 2014
On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys : On Local Phase Equilibria and the Appearance… Yardley, Victoria; Povstugar, Ivan; Choi, Pyuck-Pa Advanced Engineering Materials, Vol. 18, Issue 9 https://doi.org/10.1002/adem.201600237	journal	July 2016
Dislocation groups, multipoles, and friction stresses in α-CuZn alloys Olfe, J.; Neuhäuser, H. Physica Status Solidi (a), Vol. 109, Issue 1 https://doi.org/10.1002/pssa.2211090115	journal	September 1988
Steady State Problems in Anisotropic Elasticity Stroh, A. N. Journal of Mathematics and Physics, Vol. 41, Issue 1-4 https://doi.org/10.1002/sapm196241177	journal	April 1962
Estimate of foil thickness by stereomicroscopy technique Dlouhý, A.; Pešička, J. Czechoslovak Journal of Physics, Vol. 40, Issue 5 https://doi.org/10.1007/BF01599778	journal	May 1990
Electronic structure and the theory of phase transformations in NiMn Egorushkin, V. E.; Kulkov, S. N.; Kulkova, S. E. Physica B+C, Vol. 123, Issue 1 https://doi.org/10.1016/0378-4363(83)90011-6	journal	December 1983
Characterization and visualization of the lattice misfit associated with dislocation cores Hartley, C.; Mishin, Y. Acta Materialia, Vol. 53, Issue 5 https://doi.org/10.1016/j.actamat.2004.11.027	journal	March 2005
On the effect of long-term creep on the microstructure of a 12% chromium tempered martensite ferritic steel Aghajani, A.; Somsen, Ch.; Eggeler, G. Acta Materialia, Vol. 57, Issue 17 https://doi.org/10.1016/j.actamat.2009.07.010	journal	October 2009
High-resolution electron microscopy of dislocation ribbons in a CMSX-4 superalloy single crystal Vorontsov, V. A.; Kovarik, L.; Mills, M. J. Acta Materialia, Vol. 60, Issue 12 https://doi.org/10.1016/j.actamat.2012.05.014	journal	July 2012
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy Otto, F.; Dlouhý, A.; Somsen, Ch. Acta Materialia, Vol. 61, Issue 15 https://doi.org/10.1016/j.actamat.2013.06.018	journal	September 2013
Temperature dependence of the mechanical properties of equiatomic solid solution alloys with face-centered cubic crystal structures Wu, Z.; Bei, H.; Pharr, G. M. Acta Materialia, Vol. 81 https://doi.org/10.1016/j.actamat.2014.08.026	journal	December 2014
Mechanical properties, microstructure and thermal stability of a nanocrystalline CoCrFeMnNi high-entropy alloy after severe plastic deformation Schuh, B.; Mendez-Martin, F.; Völker, B. Acta Materialia, Vol. 96 https://doi.org/10.1016/j.actamat.2015.06.025	journal	September 2015
Atomic-scale characterization and modeling of 60° dislocations in a high-entropy alloy Smith, T. M.; Hooshmand, M. S.; Esser, B. D. Acta Materialia, Vol. 110 https://doi.org/10.1016/j.actamat.2016.03.045	journal	May 2016
Decomposition of the single-phase high-entropy alloy CrMnFeCoNi after prolonged anneals at intermediate temperatures Otto, F.; Dlouhý, A.; Pradeep, K. G. Acta Materialia, Vol. 112 https://doi.org/10.1016/j.actamat.2016.04.005	journal	June 2016
Phase stability and kinetics of σ-phase precipitation in CrMnFeCoNi high-entropy alloys Laplanche, G.; Berglund, S.; Reinhart, C. Acta Materialia, Vol. 161 https://doi.org/10.1016/j.actamat.2018.09.040	journal	December 2018
Interfacial nanophases stabilize nanotwins in high-entropy alloys Lu, Wenjun; Liebscher, Christian H.; Yan, Fengkai Acta Materialia, Vol. 185 https://doi.org/10.1016/j.actamat.2019.12.010	journal	February 2020
Consideration of kinetics on intermetallics formation in solid-solution high entropy alloys Chou, T. H.; Huang, J. C.; Yang, C. H. Acta Materialia, Vol. 195 https://doi.org/10.1016/j.actamat.2020.05.015	journal	August 2020
Fatigue crack initiation and growth in 43Fe-25Ni-22.5Cr austenitic steel at a temperature of 700 °C Mazánová, V.; Heczko, M.; Polák, J. International Journal of Fatigue, Vol. 114 https://doi.org/10.1016/j.ijfatigue.2018.04.033	journal	September 2018
Analysis of strengthening due to grain boundaries and annealing twin boundaries in the CrCoNi medium-entropy alloy Schneider, M.; George, E. P.; Manescau, T. J. International Journal of Plasticity, Vol. 124 https://doi.org/10.1016/j.ijplas.2019.08.009	journal	January 2020
Tensile properties of high- and medium-entropy alloys Gali, A.; George, E. P. Intermetallics, Vol. 39 https://doi.org/10.1016/j.intermet.2013.03.018	journal	August 2013
Deformation stimulated precipitation of a single-phase CoCrFeMnNi high entropy alloy Zhou, W.; Fu, L. M.; Liu, P. Intermetallics, Vol. 85 https://doi.org/10.1016/j.intermet.2017.02.010	journal	June 2017
Temperature dependencies of the elastic moduli and thermal expansion coefficient of an equiatomic, single-phase CoCrFeMnNi high-entropy alloy Laplanche, G.; Gadaud, P.; Horst, O. Journal of Alloys and Compounds, Vol. 623 https://doi.org/10.1016/j.jallcom.2014.11.061	journal	February 2015
Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation Gao, N.; Lu, D. H.; Zhao, Y. Y. Journal of Alloys and Compounds, Vol. 792 https://doi.org/10.1016/j.jallcom.2019.04.121	journal	July 2019
Carbide precipitation strengthening in fine-grained carbon-doped FeCoCrNiMn high entropy alloy Peng, Jian; Li, Ziyong; Fu, Liming Journal of Alloys and Compounds, Vol. 803 https://doi.org/10.1016/j.jallcom.2019.06.204	journal	September 2019
High temperature deformation in fine grained high entropy alloys Chokshi, Atul H. Materials Chemistry and Physics, Vol. 210 https://doi.org/10.1016/j.matchemphys.2017.07.079	journal	May 2018
Microstructural development in equiatomic multicomponent alloys Cantor, B.; Chang, I. T. H.; Knight, P. Materials Science and Engineering: A, Vol. 375-377 https://doi.org/10.1016/j.msea.2003.10.257	journal	July 2004
Precipitation in the equiatomic high-entropy alloy CrMnFeCoNi Pickering, E. J.; Muñoz-Moreno, R.; Stone, H. J. Scripta Materialia, Vol. 113 https://doi.org/10.1016/j.scriptamat.2015.10.025	journal	March 2016
Advanced scanning transmission stereo electron microscopy of structural and functional engineering materials Agudo Jácome, L.; Eggeler, G.; Dlouhý, A. Ultramicroscopy, Vol. 122 https://doi.org/10.1016/j.ultramic.2012.06.017	journal	November 2012
High-entropy alloys George, Easo P.; Raabe, Dierk; Ritchie, Robert O. Nature Reviews Materials, Vol. 4, Issue 8 https://doi.org/10.1038/s41578-019-0121-4	journal	June 2019
Electron Microscopy of Thin Crystals Hirsch, P. B.; Howie, A.; Nicholson, R. B. Physics Today, Vol. 19, Issue 10 https://doi.org/10.1063/1.3047787	journal	October 1966
The determination of dislocation densities in thin films Ham, R. K. Philosophical Magazine, Vol. 6, Issue 69 https://doi.org/10.1080/14786436108239679	journal	September 1961
Dislocation creep behavior of CoCrFeMnNi high entropy alloy at intermediate temperatures Kang, You Bin; Shim, Sang Hoon; Lee, Kap Ho Materials Research Letters, Vol. 6, Issue 12 https://doi.org/10.1080/21663831.2018.1543731	journal	November 2018
Effective pair potential for random fcc CoCrFeMnNi alloys Gröger, R.; Vitek, V.; Dlouhý, A. Modelling and Simulation in Materials Science and Engineering, Vol. 28, Issue 7 https://doi.org/10.1088/1361-651X/ab7f8b	journal	September 2020
Atom distributions in sigma phases. I. Fe and Cr atom distributions in a binary sigma phase equilibrated at 1063, 1013 and 923 K Yakel, H. L. Acta Crystallographica Section B Structural Science, Vol. 39, Issue 1 https://doi.org/10.1107/S0108768183001974	journal	February 1983
The crystal structure of Cr23C6 Bowman, A. L.; Arnold, G. P.; Storms, E. K. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, Vol. 28, Issue 10 https://doi.org/10.1107/S0567740872007526	journal	October 1972
Precipitation in creep resistant austenitic stainless steels Sourmail, T. Materials Science and Technology, Vol. 17, Issue 1 https://doi.org/10.1179/026708301101508972	journal	January 2001
Superdislocation Line Directions in y-Particles after Double Shear Creep of Superalloy Single Crystals Richtungsbestimmung von Superversetzungslinien in yv‘-Teilchen nach Scherkriechverformung in Superlegierungseinkristallen Dlouhy, Antonin; Eggeler, Gunther Practical Metallography, Vol. 33, Issue 12 https://doi.org/10.1515/pm-1996-331204	journal	December 1996
Current Progress in Advanced High Cr Ferritic Steels for High-temperature Applications. Fujita, Toshio ISIJ International, Vol. 32, Issue 2 https://doi.org/10.2355/isijinternational.32.175	journal	January 1992

Similar Records

Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

Journal Article · Thu Apr 23 20:00:00 EDT 2020 · Crystals · OSTI ID:2377790

Ordering effects on deformation substructures and strain hardening behavior of a CrCoNi based medium entropy alloy

Journal Article · Wed Mar 24 20:00:00 EDT 2021 · Acta Materialia · OSTI ID:1860601

Related Subjects

36 MATERIALS SCIENCE
CrMnFeCoNi Cantor alloy
dislocation cores
elemental segregation
high entropy alloys
sigma phase
thermodynamic stability

Elemental segregation to lattice defects in the CrMnFeCoNi high-entropy alloy during high temperature exposures

Citation Formats

References (39)

Similar Records

Related Subjects