Abstract
The difference in microstructure and thermal conductivity at different positions in a plate-like high-thermal-conductivity high-pressure die-cast Al-Fe-Ni alloy was investigated. The volume fraction of porosity increased from the gate to the overflow side because of the lowest temperature and intensification pressure, and a higher volume fraction of entrained air at the overflow side. The area fraction and diameter of externally solidified crystals α-Al (ESCs-α) decreased, and the eutectic fraction increased from the gate to the overflow side because of the block effect at the narrow gate to force a large number of ESCs-α staying at the gate side. Based on experimental and calculated results, the sample at the gate side with the lowest eutectic and pore fractions, and the highest fraction of low-solute-content ESCs-α exhibited the highest thermal conductivity.
Published Version
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