Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy

Lee, Chanho; Chou, Yi; Kim, George; Gao, Michael C.; An, Ke; Brechtl, Jamieson; Zhang, Chuan; Chen, Wei; Poplawsky, Jonathan D.; Song, Gian; Ren, Yang; Chou, Yi‐Chia; Liaw, Peter K.

doi:10.1002/adma.202004029

Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy

Journal Article · Sun Nov 01 23:00:00 EST 2020 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202004029· OSTI ID:1706235

Lee, Chanho ^[1]; Chou, Yi ^[2]; Kim, George ^[3]; Gao, Michael C. ^[4]; ^[5]; Brechtl, Jamieson ^[5]; Zhang, Chuan ^[6]; Chen, Wei ^[3]; ^[7]; Song, Gian ^[8]; Ren, Yang ^[9]; Chou, Yi‐Chia ^[2]; ^[10]

Univ. of Tennessee, Knoxville, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
National Chiao Tung Univ., Hsinchu (Taiwan)
Illinois Institute of Technology, Chicago, IL (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Computherm LLC, Middleton, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Kongju National Univ., Cheonan (South Korea)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Tennessee, Knoxville, TN (United States)

Severe distortion is one of the four core effects in single-phase high-entropy alloys (HEAs) and contributes significantly to the yield strength. However, the connection between the atomic-scale lattice distortion and macro-scale mechanical properties through experimental verification has yet to be fully achieved, owing to two critical challenges: 1) the difficulty in the development of homogeneous single-phase solid-solution HEAs and 2) the ambiguity in describing the lattice distortion and related measurements and calculations. Here, a single-phase body-centered-cubic (BCC) refractory HEA, NbTaTiVZr, using thermodynamic modeling coupled with experimental verifications, is developed. Compared to the previously developed single-phase NbTaTiV HEA, the NbTaTiVZr HEA shows a higher yield strength and comparable plasticity. The increase in yield strength is systematically and quantitatively studied in terms of lattice distortion using a theoretical model, first-principles calculations, synchrotron X-ray/neutron diffraction, atom-probe tomography, and scanning transmission electron microscopy techniques. These results demonstrate that severe lattice distortion is a core factor for developing high strengths in refractory HEAs.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Fossil Energy (FE); US Army Research Office (ARO); National Science Foundation (NSF); Ministry of Science and Technology of Taiwan (MOST); Ministry of Education of the Republic of Korea; National Research Foundation of Korea (NRF); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; 89243318CFE000003; 89233218CNA000001

OSTI ID:: 1706235

Alternate ID(s):: OSTI ID: 1804161
OSTI ID: 1711415
OSTI ID: 1813125

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 49 Vol. 32; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Lattice distortion in a strong and ductile refractory high-entropy alloy

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