Tailoring microstructure in sintered Cu-Cr-Nb-Zr alloys for fusion components

Cheng, Bin; Wang, Ling; Sprouster, David J.; Trelewicz, Jason R.; Zhong, Weicheng; Yang, Ying; Zinkle, Steven J.; Snead, Lance L.

doi:10.1016/j.jnucmat.2021.152956

Title: Tailoring microstructure in sintered Cu-Cr-Nb-Zr alloys for fusion components

Journal Article · Fri Mar 26 00:00:00 EDT 2021 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2021.152956· OSTI ID:1820772

Cheng, Bin ^[1];

^[2];

^[1]; Trelewicz, Jason R. ^[3];

^[4];

^[4]; Zinkle, Steven J. ^[5]; Snead, Lance L. ^[1]

Stony Brook Univ., NY (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Stony Brook Univ., NY (United States); Stony Brook Univ., NY (United States). Inst. for Advanced Computational Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

High temperature, creep resistant heat sink materials represent a critical need for plasma facing components in future fusion reactors. In this study, we employ direct current sintering (often referred to as spark plasma sintering) to produce a Cu-Cr-Nb-Zr (CCNZ) alloy from gas-atomized feedstock powder with tailored precipitate distributions for enhanced stability and creep resistance. Microstructure was characterized by synchrotron X-ray diffraction, small angle X-ray scattering, and electron microscopy techniques. We report a multi-modal precipitate distribution containing submicron Cr (~493 nm) and Cr₂Nb (~90 nm) precipitates at grain boundaries and a high density of nanoscale Cr (~8 nm) precipitates homogeneously distributed through the Cu matrix. By comparing the as-sintered and aged microstructures, precipitation kinetics are discussed in the context of dislocation networks due to the high sintering pressures biasing precipitate formation and the role of subsequent recovery and recrystallization. Furthermore, due to the presence of the multi-modal precipitate distribution, the sintered CCNZ alloy exhibited a high hardness of 133.2 HV while retaining an appreciable thermal conductivity of 298.4 W/m·K and electrical conductivity of 74.6% relative to the International Annealed Copper Standard.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; SC0018322; SC0012704; P30GM133893; SC0006661; KP1605010

OSTI ID:: 1820772

Alternate ID(s):: OSTI ID: 1815105

Journal Information:: Journal of Nuclear Materials, Vol. 551; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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