添加B对元素粉末热挤压制备Cu-B复合材料微观结构和导热性能的影响

IF 1.9 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Y. Chun, Seunghyeok Chung, C. Rhee, H. Ryu
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Effects of B addition on microstructure and thermal conductivity of Cu–B composites produced by hot-extrusion of elemental powders
ABSTRACT 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.
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来源期刊
Powder Metallurgy
Powder Metallurgy 工程技术-冶金工程
CiteScore
2.90
自引率
7.10%
发文量
30
审稿时长
3 months
期刊介绍: Powder Metallurgy is an international journal publishing peer-reviewed original research on the science and practice of powder metallurgy and particulate technology. Coverage includes metallic particulate materials, PM tool materials, hard materials, composites, and novel powder based materials.
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