Per: GABRIEL MOREIRA GONCALVES (Instituto militar de engenharia), Iana Costa Carvalho (instituto militar de engenharia), rodolfo da silva teixeira (instituto militar de engenharia), Paulo Davi Borges Esteves (instituto militar de engenharia), Andersan dos Santos Paula (instituto militar de engenharia)
Abstract:
Of relatively simple structures and with a wide possibility of alloy elements combinations and consequently of properties, several metallic alloys have been developed and studied since the last century and in this new millennium the high entropy high alloys (HEA) stand out, especially if highlights the Al-Co-Cr-Fe-Ni alloy system, which stands out for its resistance to corrosion and mechanics, and low density. The present work aims to quantify the present phases of the AlCo2Cr2FeNi2 alloy, dendritic and inter-dendritic regions, as casted and heat treated (1050 ºC for 1 hour, followed by cooling in water) aid by optical microscopy and scanning electron microscopy. It was found that about 80% of the microstructure consists of dendritic region and about 20% is inter-dendritic region in both of samples, only differentiating the microstructural aspect in the condition treated by the formation of rod-shaped precipitates in both regions.