Microstructure and properties of AlCrFeNi intermetallic for electronic packaging shell

An AlCrFeNi quaternary alloy was prepared by design method of high entropy alloy, and microstructure and mechanical properties of this alloy were studied by means of XRD, SEM, TEM and other testing method. The results show that AlCrFeNi alloy has a simple crystal structure (BCC)and phase composition, microstructure is eutectic alloy of NiAl/(α-Fe, Cr) with the nanoscale eutectic spaces. The room temperature compression yield strength, compression strength and compression rates of the AlCrFeNi alloy are 1180MPa, 2162MPa and 40% respectively. Compared with AlCrFeCoNiCu alloy and NiAl alloy, the AlCrFeNi alloy has excellent mechanical properties. The research results can provide a possibility for new shell materials of micro-electronic packaging.