EFFECT OF HOMOGENIZING TREATMENT ON Al-Fe-Si INTERMETALLIC PHASES IN A 6063 ALUMINUM ALLOY

摘要

The effect of homogenizing treatment on occurrence of Al-Fe-Si intermetallic compound particles in a 6063 aluminum alloy was investigated using X-ray diffraction and transmission electron microscopy (TEM). The intermetallic phases were extracted from the ingot by the thermal phenol method. In the 0.1mass%Fe as-cast ingot at the casting cooling rate of 0.06K/S, the most of the β -AlFeSi phases (monoclinic : a=b=0.612nm, c=4.15nm, β=91 °) observed. Similarly, in the 0.5mass%Fe as-cast ingot at the casting cooling rate of 50K/S, the most of the α-AlFeSi phases (cubic : a=1.252nm or 1.256nm) observed. To clarify the effect of homogenizing treatment on these intermetallic phases, each ingot was homogenized at 858K for 54ks and 2400ks, and Al-Fe-Si intermetallic phases in these ingots were investigated. When these ingots were homogenized at 858K for 2400ks, the α '-AlFeSi phase (hexagonal : a=1.23nm, c=2.62nm) was mainly observed, and the a -AlFeSi phase and the β -AlFeSi phase could not be observed.