Effects of B addition on microstructure and thermal conductivity of Cu-B composites produced by hot-extrusion of elemental powders

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This work proposes a new neutron absorber, Cu-B composites, with excellent thermal conductivity and good neutron absorbing capability. Mixtures of elemental Cu and B powders with the B contents varying between 10 and 40 at.-% were consolidated into round bars by hot extrusion. The addition of B significantly refined the grain structure, which is related to the suppression of dynamic recrystallisation during hot extrusion and extended recovery during subsequent annealing. Such fine-grained structure in Cu-B composites together with dispersion hardening by B particles contributed to the higher hardness of Cu-B composites. The thermal conductivity of Cu-B composites, being roughly two times higher than that of Al-B4C MMC, decreases with increasing the B contents, which is mainly due to higher volume fraction B particles with lower thermal conductivity, and partly to texture randomisation and refined grain structure in the Cu-B composites.
Publisher
TAYLOR & FRANCIS LTD
Issue Date
2023-10
Language
English
Article Type
Article
Citation

POWDER METALLURGY, v.66, no.5, pp.662 - 668

ISSN
0032-5899
DOI
10.1080/00325899.2023.2223794
URI
http://hdl.handle.net/10203/314394
Appears in Collection
NE-Journal Papers(저널논문)
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