Thermophysical properties of uranium-zirconium alloys

Takahashi, Yoshihiro; Yamawaki, Michio; Yamamoto, Kazutaka

doi:10.1016/0022-3115(88)90127-4

Cited by 76 publications

(42 citation statements)

References 6 publications

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“…The values from this work coincide well with those from Takahashi et al [45] in the region from 300 to 500 K and with those from Touloukian et al [9] from 750 K up to the beginning of the phase transition region (approximately 1070 K). At high temperatures, in the bcc phase, our results are the highest, far above those predicted by Touloukian et al [9] and measured by Zinovyev [8].…”

Section: Thermal Diffusivitysupporting

confidence: 89%

“…He measured the thermal diffusivity from room temperature up to the phase transition. The laser flash method was used both by Murabayashi et al [44] and Takahashi et al [45]. Both groups reported testing of high-purity samples, but did not report data on the analysis of the samples.…”

Section: Thermal Diffusivitymentioning

confidence: 98%

“…For both groups, measurements at temperatures below the phase transition were performed. The reported errors were 1.5% in [44] and less than 5% in [45]. Finally, Zinovyev [8] proposed reference data on the thermal diffusivity of zirconium over a wide temperature range, covering both hcp and bcc phases.…”

Section: Thermal Diffusivitymentioning

confidence: 99%

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Thermophysical Properties of Solid Phase Zirconium at High Temperatures

Milošević

Maglić

2006

Int J Thermophys

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This paper presents experimental results on the thermophysical properties of relatively pure polycrystalline zirconium samples in the solid phase from room temperature up to near the melting point. The specific heat capacity and specific electrical resistivity were measured from 290 to 1970 K, the hemispherical total emissivity from 1400 to 2000 K, the normal spectral emissivity from 1480 to 1940 K, and the thermal diffusivity in the range from 290 to 1470 K. From these data, the thermal conductivity and Lorentz number were computed in the range from 290 to 1470 K. For necessary corrections the most recent values of the linear thermal expansion from the literature have been used. Subsecond pulse calorimetry for measuring heat capacity, specific electrical resistivity, and both emissivities and the laser flash method for measuring thermal diffusivity were applied. Samples in the form of a thin rod and in the form of a thin disk were used in the first and second methods, respectively. Measurement uncertainties were generally about 3% for heat capacity, 1.6% for specific electrical resistivity, 3-10% for the two emissivities, and from less than 1% up to 6% for thermal diffusivity. All the results are discussed in reference to available literature data.

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Section: Thermal Diffusivitysupporting

confidence: 89%

Section: Thermal Diffusivitymentioning

confidence: 98%

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Thermophysical Properties of Solid Phase Zirconium at High Temperatures

Milošević

Maglić

2006

Int J Thermophys

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“…The thermal conductivity measured at zero strain is measured to be 20 W m -1 K -1 . Due to the lack of data on the thermal conductivity of nanocrystalline Zr, we compared the measured result with the value of bulk Zr which is around 22.6 W m -1 K -1 [46,47]. This validates our experimental procedure since the literature suggests that thermal conductivity will decrease when the grain size becomes smaller.…”

Section: Methodssupporting

confidence: 80%

Grain size-induced thermo-mechanical coupling in zirconium thin films

Wang

Pulavarthy

Haque

2015

J Therm Anal Calorim

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At the bulk scale, thermal conductivity of metals is not coupled with mechanical strain. However, this may not be the same for grain sizes below the electron mean free path, for which mechanical deformation mechanism and volume fraction of grain boundaries are drastically different from the bulk. To investigate this hypothesis of grain size-induced thermo-mechanical coupling, we developed an experimental setup to measure the thermal conductivity of 100-nm-thick freestanding nanocrystalline zirconium (Zr) films as a function of externally applied mechanical strain. Experimental results show strong mechanical strain-thermal conductivity coupling, thermal conductivity of Zr film dropped from 20 to 13 W m -1 K -1 with an increasing strain from 0 to 1.24 %. Thermal conductivity of Zr film was also measured as a function of average grain size ranging from as-deposited 10 nm to asgrown 250 nm. The results clearly show that for grain sizes above 10 nm, mechanical strain has no influence over thermal conductivity, which supports the proposed hypothesis.

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“…4(a). This is because the thermal diffusivity of U is nearly constant in the temperature range up to 900 K (Takahashi et al, 1988). The present experimental values are approximately 1.5 times those of 10 wt% U-ZrH x (Nakata et al, 1966), depending on the amount of doped-U.…”

Section: Methodssupporting

confidence: 60%