From suppressed void growth to significant void swelling in NiCoFeCr complex concentrated solid-solution alloy

Fan, Zhe; Yang, Tai-ni; Kombaiah, Boopathy; Wang, Xing; Edmondson, Philip; Osetskiy, Yury N.; Jin, Ke; Lu, Chenyang; Bei, Hongbin; Lumin, Wang; More, Karren; Weber, William; Zhang, Yanwen

doi:10.1016/j.mtla.2020.100603

From suppressed void growth to significant void swelling in NiCoFeCr complex concentrated solid-solution alloy

Journal Article · Sun Mar 01 00:00:00 EST 2020 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2020.100603· OSTI ID:1619045

Fan, Zhe ^[1]; Yang, Tai-ni ^[2]; ^[1]; ^[3]; ^[1]; ^[1]; ^[1]; Lu, Chenyang ^[2]; ^[1]; Lumin, Wang ^[2]; ^[3]; ^[4]; ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Univ. of Michigan, Ann Arbor, MI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States)

Void swelling can result in dimensional instability and undermine the safe operation of nuclear reactors. Current strategies to inhibit void swelling mainly focus on enhancing defect absorption and recombination by introducing high-density defect sinks. Complex concentrated solid-solution alloys (CSAs), including high-entropy alloys, can withstand severe radiation damage due to their inherent chemical complexity without interfaces. However, the underlying mechanisms for void suppression in CSAs are far from clear. In this research, we studied the void evolution with respect to irradiation depths, doses, and temperatures in equiatomic NiCoFeCr under 3 MeV Ni ion irradiations. At relatively low doses (16 and 54 displacements per atom, dpa), voids form mainly outside of the ion-damaged region, and void formation in the peak damage region is suppressed, leading to negligible swelling. However, with further increase of dose (86 up to 250 dpa), significant void growth occurs in the peak damage region and extended dislocation lines dominate instead of short dislocation lines and loops formed at lower doses. From 500 to 700 °C, the dislocation density decreases while dislocations grow. Although the overall void swelling increases dramatically from 500 to 580 °C at 54 dpa, void growth in the peak damage region is still suppressed. The transition from suppressed void growth to significant void swelling is attributed to dislocation evolution and local chemical inhomogeneity (enrichment of Fe/Cr in the matrix) at higher doses. Our study shows that controlling element diffusion and defect evolution through tuning chemical complexity can further enhance the swelling resistance of CSAs.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1619045

Alternate ID(s):: OSTI ID: 1704033

Journal Information:: Materialia, Journal Name: Materialia Journal Issue: C Vol. 9; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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