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- W2995863752 abstract "We have developed a new material for neutron shielding applications where space is restricted. W$_2$B is an excellent attenuator of neutrons and gamma-rays, due to the combined gamma attenuation of W and neutron absorption of B. However, its low fracture toughness (~3.5 MPa$cdot$m$^{0.5}$) and high melting point (2670 {deg}C) prevent the fabrication of large fully-dense monolithic parts with adequate mechanical properties. Here we meet these challenges by combining W$_2$B with a minor fraction (43 vol.%) of metallic W. The material was produced by reaction sintering W and BN powders. The mechanical properties under flexural and compressive loading were determined up to 1900 {deg}C. The presence of the ductile metallic W phase enabled a peak flexural strength of ~950 MPa at 1100 {deg}C, which is a factor of 2-3 higher than typical monolithic transition-metal borides. Its ductile-brittle transition temperature of ~1000 {deg}C is typical of W-based composites, which is surprising as the W phase was the minor constituent and did not appear to form a fully continuous network. Compression tests showed hardening below ~1500 {deg}C and significant elongation of the phase domains, which suggest that by forging or rolling, further improvements in ductility may be possible." @default.
- W2995863752 created "2019-12-26" @default.
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- W2995863752 date "2020-04-01" @default.
- W2995863752 modified "2023-09-26" @default.
- W2995863752 title "A high temperature W2B–W composite for fusion reactor shielding" @default.
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- W2995863752 doi "https://doi.org/10.1016/j.jnucmat.2020.152062" @default.
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