<p>This study aimed to accurately measure the density (<i>ρ</i>), normal spectral emissivity (<i>ε</i>), heat capacity at constant pressure (<i>C</i><sub><i>p</i></sub>), and thermal conductivity (<i>κ</i>) of the Ti–6 mass % Al–4 mass % V (Ti64) melt by electromagnetic levitation with a static magnetic field and laser modulation calorimetry. A static magnetic field was applied to the levitated Ti64 melt to suppress the surface oscillation and translational motion of the droplets, and to suppress the convection flow inside the droplet for each property measurement, as needed. The measurement uncertainty was analyzed for all of the thermophysical property data. The excess volume and excess heat capacity of the Ti64 melt obtained in this study were compared with those evaluated using the ideal solution model. The contribution of the thermal vibrations of the atoms in <i>κ</i> for the Ti64 melt was evaluated from the difference between the measured thermal conductivity (<i>κ</i>) value and the <i>κ</i> values calculated using the Wiedemann–Franz law.</p>

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Density, Normal Spectral Emissivity, Heat Capacity, and Thermal Conductivity of the Ti6Al4V Melt Measured by Electromagnetic Levitation with a Static Magnetic Field

  • Manabu Watanabe,
  • Suguru Funada,
  • Makoto Ohtsuka,
  • Masayoshi Adachi,
  • Hiroyuki Fukuyama

摘要

This study aimed to accurately measure the density (ρ), normal spectral emissivity (ε), heat capacity at constant pressure (Cp), and thermal conductivity (κ) of the Ti–6 mass % Al–4 mass % V (Ti64) melt by electromagnetic levitation with a static magnetic field and laser modulation calorimetry. A static magnetic field was applied to the levitated Ti64 melt to suppress the surface oscillation and translational motion of the droplets, and to suppress the convection flow inside the droplet for each property measurement, as needed. The measurement uncertainty was analyzed for all of the thermophysical property data. The excess volume and excess heat capacity of the Ti64 melt obtained in this study were compared with those evaluated using the ideal solution model. The contribution of the thermal vibrations of the atoms in κ for the Ti64 melt was evaluated from the difference between the measured thermal conductivity (κ) value and the κ values calculated using the Wiedemann–Franz law.