Effect of Rare Earth Ce on the Growth of Primary Al₁₃Fe₄ Phase in Al-5Fe Alloy

Abstract:

The solid-liquid mixture of Al-5Fe-xRE alloy is "frozen" through rapid cooling technology to prepare solid samples (the weight percentage of Rare Earth Ce added in x: 0%, 0.9%, and 5%). The effect of Ce on the growth of primary Al₁₃Fe₄ phase is studied by means of differential scanning calorimetry (DSC) and field emission transmission electron microscopy (TEM).The results show that with the increase in the amount of Ce in the alloy, the transition temperature of the primary Al₁₃Fe₄ phase increases. The addition of Ce changes the crystallization process of the primary phase. When Al-5Fe-xRE alloy is rapidly cooled at 690°C, the primary phase interface of Al-5Fe-5Ce alloy has more Rare Earth enrichment than that of Al-5Fe-0.9Ce alloy. However, the primary phase of Al-5Fe-5Ce alloy is still relatively coarse. Obviously, excessive Ce does not play a role in modification, so the enrichment of Ce at the interface may not be the main reason for refining the primary iron-rich phase When the Al-5Fe-5Ce alloy is rapidly cooled at 750°C and 690°C, respectively, the Ce at the interface tends to increase. The enrichment area of Ce forms a "film" at the interface of the primary phase, and then it transform into Al₈CeFe₂ phase after solidification. The interface structure of the primary and Al₈CeFe₂ is semi-coherent.

• Periodical: Solid State Phenomena (Volume 330)
• Pages: 25-29
• DOI: https://doi.org/10.4028/p-g30595
• Online since: April 2022
• Authors: Peng Liu, Yi Dan Zeng*, Jin Zhang
• Keywords: Al-5Fe-xRE Alloy, Ce-Rich Rare Earth, Element Enrichment, Primary Al₁₃Fe₄ Phase, Rapid Cooling

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