Temperature dependence of thermal conductivity in W and W–Re alloys from 300 to 1000 K

Tanabe, Tatsuhiko; Eamchotchawalit, Chutima; Busabok, Chumphol; Taweethavorn, S.; Fujitsuka, M.; Shikama, Tatsuo

doi:10.1016/s0167-577x(02)01403-9

Cited by 73 publications

(40 citation statements)

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“…The λ e obtained for OFHC copper and Cu-Cr-Zr-Ti alloy was 398 Wm −1 K −1 and 248 Wm −1 K −1 , respectively, which clearly shows that λ e for the alloy is suppressed due to alloying elements. This result is in line with that obtained for MgSc alloys, where it was reported that significant change has been noticed in λ e with the concentration of the alloying element added to the alloy [14,15].…”

Section: Resultssupporting

confidence: 92%

“…However, the gap between the curves was more at room temperature, and it diminished with increase in temperature. A similar increasing trend of thermal conductivity with temperature was reported in copper alloys [9,10], platinum alloys [12], tungsten alloys [13], and magnesium alloys [14,15]. The reason for lower thermal conductivity for alloys can be attributed to the alloying elements added to the matrix.…”

Section: Resultssupporting

confidence: 75%

“…It is seen from the Figure 1 that the thermal conductivity of Cu-Cr-Zr-Ti alloy increases with temperature up to 873 K. The reason for such increasing trend to a larger extent may be attributed to the increase in electronic thermal conductivity with temperature [13][14][15]. Nevertheless, some contribution can be ascribed to microstructural changes occurring in the specimen during the test.…”

Section: Resultsmentioning

confidence: 94%

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Thermal Conductivity of Cu-Cr-Zr-Ti Alloy in the Temperature Range of 300–873 K

et al. 2012

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In the present investigation, thermal conductivity of Cu-Cr-Zr-Ti alloy was determined as the product of the specific heat (C p ), thermal diffusivity (α), and density (ρ) in the temperature range of 300-873 K. The experimental results showed that the thermal conductivity of the alloy increased with increase in temperature up to 873 K and the data was accurately modeled by a linear equation. For comparison, thermal conductivity was also evaluated for OFHC copper in the same temperature range. The results obtained were discussed using electrical conductivity and hardness measurements made at room temperature. Transmission electron microscopy (TEM) was done to understand the microstructural changes occurring in the sample after the test. Wiedemann-Franz-Lorenz law was employed for calculating electronic and phonon thermal conductivity using electrical conductivity. On the basis of studies conducted it was deduced that in situ aging may be one of the reasons for the increase in thermal conductivity with temperature for Cu-Cr-Zr-Ti alloy.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 94%

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Thermal Conductivity of Cu-Cr-Zr-Ti Alloy in the Temperature Range of 300–873 K

et al. 2012

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“…For example, tungsten has high thermal conductivity, however this decreases to half the value for pure tungsten by the addition of 5 mass% Re. 5,6) In terms of microstructural evolution, it has been reported that phase precipitates (Re 3 W) were formed in W-xRe alloys after 0.5-0.7 dpa irradiation at 600-1500 C without void formation, and the bulk properties were affected by this precipitation. 7) Heavy neutron irradiation induced large irradiation hardening in W26Re alloy by irradiation-induced precipitation.…”

Section: )mentioning

confidence: 99%

Precipitation of Solid Transmutation Elements in Irradiated Tungsten Alloys

et al. 2008

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Tungsten-based model alloys were fabricated to simulate compositional changes by neutron irradiation, performed in the JOYO fast test reactor. The irradiation damage range was 0.17-1.54 dpa and irradiation temperatures were 400, 500 and 750 C. After irradiation, microstructural observations and electrical resistivity measurements were carried out. A number of precipitates were observed after 1.54 dpa irradiation. Rhenium and osmium were precipitated by irradiation, which suppressed the formation of dislocation loops and voids. Structures induced by irradiation were not observed so much after 0.17 dpa irradiation. Electrical resistivity measurements showed that the effects of osmium on the electrical resistivity, related to impurity solution content, were larger than that of rhenium. Measurements of electrical resistivity of ternary alloys showed that the precipitation behavior was similar to that in binary alloys.

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“…The low temperature embrittlement was improved by Re addition, 2,3) but the thermal conductivity and diffusivity decrease to about half of pure W by addition of 5 mass%Re. 4,5) Furthermore irradiation induced precipitations including and phase were produced and large irradiation hardening was induced in W-26Re alloy by heavy neutron irradiation. 6) Though Os is a main transmutation element from W and Re and affects properties of W alloys, there are few reports concerning irradiation to W-Os alloys.…”

Section: Introductionmentioning

confidence: 99%

Effects of Transmutation Elements on Neutron Irradiation Hardening of Tungsten

et al. 2007

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Tungsten (W) is a candidate material for Plasma facing materials of fusion reactors. During fusion reactor operation, not only irradiation damages but also transmutation elements such as rhenium (Re) and osmium (Os) are produced by neutron irradiation. As a result, the original pure tungsten changes to W-Re or W-Re-Os alloys. Thus, the mechanical and physical properties are expected to change. The aim of this study is to investigate the effects of transmutation elements on neutron irradiation hardening and microstructure changes of tungsten.To simulate the effects of transmutation elements, tungsten base model alloys were used in this study. The examined compositions of the alloys were selected from the calculated changes in solid solution area of W-Re-Os alloy. Neutron irradiation was performed in fast test reactor JOYO in JAEA. The irradiation damages and temperature ranges were 0.17-1.54 dpa and 400-750 C respectively. After the irradiation, Vickers hardness test and TEM observation were performed.There were clear differences between Re and Os in effects on irradiation hardening. In the case of W-Re alloys, when damages were less than 0.40 dpa, the irradiation hardenings were nearly equal to those of pure tungsten independent of Re addition. But when the damage was 1.54 dpa, the irradiation hardenings increased lineally with Re content. Microstructural observations showed that precipitations mainly formed in W-Re alloys. In the case of W-Os alloys, the irradiation hardenings (ÁHv) of W-3Os alloys were larger than those of pure tungsten. And the differences were about 400 independent of dpa and irradiation temperature. Effects of Re and Os on irradiation hardening based on the microstructural observations were discussed.

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Temperature dependence of thermal conductivity in W and W–Re alloys from 300 to 1000 K

Cited by 73 publications

References 1 publication

Thermal Conductivity of Cu-Cr-Zr-Ti Alloy in the Temperature Range of 300–873 K

Thermal Conductivity of Cu-Cr-Zr-Ti Alloy in the Temperature Range of 300–873 K

Precipitation of Solid Transmutation Elements in Irradiated Tungsten Alloys

Effects of Transmutation Elements on Neutron Irradiation Hardening of Tungsten

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