TY - JOUR
T1 - Thermal properties of pure tungsten and its alloys for fusion applications
AU - Fukuda, Makoto
AU - Hasegawa, Akira
AU - Nogami, Shuhei
N1 - Funding Information:
The authors thank Dr. Osamu Tsukamoto and Mr. Yasuharu Ishiguro of NETZCH Japan for their help with the specific-heat measurements. The microstructure observations by STEM were carried out at the International Research Center for Nuclear Materials Science of the Institute for Materials Research (IMR), Tohoku University, Japan; the authors thank Prof. Kenta Yoshida and the IMR staff for their assistance. This study was supported by JSPS KAKENHI (Grant Number 24246151 and 17H01364 ) and by the NIFS LHD collaboration research program ( NIFS11KOBF019 ).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/7
Y1 - 2018/7
N2 - Tungsten is a promising candidate for plasma-facing materials in a fusion reactor, and several research studies have been conducted to improve the mechanical properties of pure W. However, the thermal properties are also important characteristics of plasma-facing materials. In this study, the thermal properties of pure W and its alloys were measured, and the effect of alloying on the thermal properties of pure W was investigated. Potassium-bubble (K-bubble) dispersion, which is one of the major methods utilized to improve the mechanical properties of W, did not affect the thermal diffusivity and conductivity of pure W. On the other hand, the presence of rhenium, which is major alloying element of W, affected the absolute values and the temperature dependence of thermal diffusivity and conductivity. The effect of alloying on specific heat and the anisotropy in thermal diffusivity of pure W and its alloys were also investigated. Measurements of the specific heat showed that K-bubble dispersion and Re addition had insignificant effects on the values obtained for pure W. Anisotropy in thermal diffusivity was not observed, and the effect of anisotropic grain structure and alloying was insignificant.
AB - Tungsten is a promising candidate for plasma-facing materials in a fusion reactor, and several research studies have been conducted to improve the mechanical properties of pure W. However, the thermal properties are also important characteristics of plasma-facing materials. In this study, the thermal properties of pure W and its alloys were measured, and the effect of alloying on the thermal properties of pure W was investigated. Potassium-bubble (K-bubble) dispersion, which is one of the major methods utilized to improve the mechanical properties of W, did not affect the thermal diffusivity and conductivity of pure W. On the other hand, the presence of rhenium, which is major alloying element of W, affected the absolute values and the temperature dependence of thermal diffusivity and conductivity. The effect of alloying on specific heat and the anisotropy in thermal diffusivity of pure W and its alloys were also investigated. Measurements of the specific heat showed that K-bubble dispersion and Re addition had insignificant effects on the values obtained for pure W. Anisotropy in thermal diffusivity was not observed, and the effect of anisotropic grain structure and alloying was insignificant.
KW - Specific heat
KW - Thermal conductivity
KW - Thermal diffusivity
KW - Thermal properties
KW - Tungsten
KW - Tungsten alloy
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U2 - 10.1016/j.fusengdes.2018.04.117
DO - 10.1016/j.fusengdes.2018.04.117
M3 - Article
AN - SCOPUS:85046804301
SN - 0920-3796
VL - 132
SP - 1
EP - 6
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
ER -