Microstructure Evolution of an Al-Fe-Ni Alloy with Zr and Sc Additions Upon Different Cooling Rates During Solidification for Improving the Mechanical and Electrical Conductivity Properties

摘要

Al-Fe-Ni eutectic alloys have high potential for being alternative aluminum alloys for various electronic and electrical applications instead of conventional low-conductivity Al casting alloys. Furthermore, the addition of Zr and Sc up to 0.3-0.6 wt% improves the hardness for high temperature applications, which is a result of the finer Al-Fe-Ni eutectic structure, and precipitation hardening of Al_3Zr and/or Al_3Sc nanopre-cipitates. Thus, the aim of the present contribution is to analyze the microstructure features changes in an Al-l.75Fe-l.25Ni eutectic alloy upon different cooling rates during solidification. The features of Al-Fe-Ni eutectics and intermetallics were studied quantitatively, and the mechanical properties and electrical conductivity were measured.