| METALS AND METAL MATRIX COMPOSITES |
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| Microstructure Evolution and Eutectic Deviation Mechanism of Al-1.75Fe-1.25Ni Eutectic Alloy Prepared by Controlled Diffusion Solidification |
| SHU Guolin, MO Liling, LIN Mingxian, DU Jun*
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| School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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Abstract Controlled diffusion solidification (CDS) is a process in which precursor alloys with high and low thermal masses are mixed in a certain ratio to obtain alloys of desired target compositions. The Al-1.75Fe-1.25Ni eutectic alloy was prepared by controlled diffusion solidification process based on Al-Fe and Al-Ni binary alloys as precursor melts in this work, it was found that a significant eutectic point deviation phenomenon occurred, and the typical hypoeutectic microstructure characteristics were presented in the alloy. An alloy with a composition approximately 1.3 times of the eutectic point deviation displayed a fully eutectic microstructure under controlled diffusion solidification. Through solidification thermal analysis curves results, it is observed that the eutectic plateau reaction time is extended under controlled diffusion solidification, leading to the formation of more primary α-Al phases. According to the Gibbs free energy curve results, the range for α-Al formation expands and the nuclei can exist more stably, causing a shift to the right in the eutectic point of the alloy during the controlled diffusion solidification process. These findings may provide some theoretical guidance for the fabrication of Al-Fe-Ni eutectic alloys by controlled diffusion solidification.
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Published: 10 October 2025
Online: 2025-09-24
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2025, Vol. 39 
