MILLING AND CONSOLIDATION BY HOT ROLLING OF Al-Fe-Cr ALLOY

摘要

This paper discusses the preparation of partially amorphous Al_(90)Fe_5Cr_5 and Al_(90)Fe_7Cr_3 powder alloys by mechanical milling and their subsequent consolidation by hot milling. Samples milled for 60 hours showed a microstructure composed of amorphous phase and nanocrystalline Al. The heat treatment of these powders resulted in the equilibrium phases: fcc-Al + (Al_3Fe and Al_5Cr intermetallic phases). Hot rolling these powders at 430℃ resulted in consolidated samples with a fine microstructure composed of Al, Al_3Fe and Al_5Cr intermetallic phases and high porosity. The high hardness values of about 417H_v of the intermetallic compounds formed during the rolling process presented the main obstacle to obtaining totally homogenous and consolidated samples.