Heat capacity and phase transition of Zircaloy-4
1997; Elsevier BV; Volume: 247; Linguagem: Inglês
10.1016/s0022-3115(97)00048-2
ISSN1873-4820
AutoresTakayuki Terai, Yoichi Takahashi, Shinya Masumura, Toshiaki Yoneoka,
Tópico(s)Thermodynamic and Structural Properties of Metals and Alloys
ResumoHeat capacity from 300 K to 1100 K and enthalpy change of the phase transition of Zircaloy-4 between 1080 K and 1270 K were measured with a triple-cell-type differential scanning calorimeter and a twin-type drop calorimeter. Heat capacities measured with these two apparatuses were in good agreement with each other, and they were several % less than the other literature values. They were also in good agreement with the values calculated by assuming the additivity of the contributions of the elements and the values of pure zirconium. On the phase transition, two peaks were observed in the temperature range from 1080 K to 1270 K. The first peak was assigned to a eutectic temperature of the ZrFe system or the ZrCr system, and the second peak was considered to come from the α−β phase transition of Zr affected by Sn and O. The enthalpy change of the α-β phase transition (ΔHtr) was determined to be 4.12 ± 0.35 kJ mo−1 which was in good agreement with literature values for pure Zr.
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