Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

Hu, G. W.; Zeng, L. C.; Du, H.; Liu, X. W.; Wu, Y.; Gong, P.; Fan, Z. T.; Hu, Q.; George, E. P.

doi:10.1016/j.jmst.2020.02.073

Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

Journal Article · Tue May 19 00:00:00 EDT 2020 · Journal of Materials Science and Technology

DOI:https://doi.org/10.1016/j.jmst.2020.02.073· OSTI ID:1785695

Hu, G. W. ^[1]; Zeng, L. C. ^[2]; Du, H. ^[1]; Liu, X. W. ^[3]; Wu, Y. ^[4]; Gong, P. ^[5]; Fan, Z. T. ^[5]; Hu, Q. ^[6]; George, E. P. ^[7]

Wuhan Univ. of Science and Technology (China); Huazhong Univ. of Science and Technology, Wuhan (China)
Wuhan Univ. of Science and Technology (China)
Huazhong Univ. of Science and Technology, Wuhan (China); Univ. of Science and Technology Beijing (China)
Univ. of Science and Technology Beijing (China)
Huazhong Univ. of Science and Technology, Wuhan (China)
Jiangxi Academy of Sciences, Nanchang (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

In the present study, we selected solutes to be added to the CrCoNi medium-entropy alloy (MEA) based on the mismatch of self-diffusion activation energy (SDQ) between the alloying elements and constituent elements of the matrix, and then investigated their grain growth behavior and mechanical properties. Mo and Al were selected as the solutes for investigation primarily because they have higher and lower SDQ, respectively, than those of the matrix elements; a secondary factor was their higher and lower shear modulus. Their concentrations were fixed at 3 at.% each because previous work had shown these compositions to be single-phase solid solutions with the face-centered cubic structure. Three alloys were produced by arc melting, casting, homogenizing, cold rolling and annealing at various temperatures and times to produce samples with different grain sizes. They were (a) the base alloy CrCoNi, (b) the base alloy plus 3 at.% Mo, and (c) the base alloy plus 3 at.% Al. The activation energies for grain growth of the CrCoNi, CrCoNi-3Mo and CrCoNi-3Al MEAs were found to be ~251, ~368 and ~219 kJ/mol, respectively, consistent with the notion that elements with higher SDQ (in this study Mo) retard grain growth (likely by a solute-drag effect), whereas those with lower values (Al) accelerate grain growth. The room-temperature tensile properties show that Mo increases the yield strength by ~40% but Al addition has a smaller strengthening effect consistent with their relative shear moduli. The yield strength as a function of grain size for the three singlephase MEAs follows the classical Hall-Petch relationship with much higher slopes (> 600 MPa μm^-0.5) than traditional solid solutions. Furthermore, this work shows that the grain growth kinetics and solid solution strengthening of the CrCoNi MEA can be tuned by selecting solute elements that have appropriate diffusion and physical properties.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1785695

Alternate ID(s):: OSTI ID: 1862160

Journal Information:: Journal of Materials Science and Technology, Journal Name: Journal of Materials Science and Technology Vol. 54; ISSN 1005-0302

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Grain growth kinetics
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Solid solution strengthening
Solute-drag effect

Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

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