Preparation of L12-Al67Cu8Ti25 Refiner and Effects on Microstructure of Aluminum Alloys
The L12-Al67Cu8Ti25 intermetallic compound was prepared by high-energy ball milling and vacuum sinter-ing,which was crushed and mixed with Al powder to fabricate Al-25Al67Cu8Ti25 compound refiner.The influence of milling time and sintering temperature on the preparation of L12-Al67Cu8Ti25 intermetallic compounds were investigated.Taking pure aluminum and Al-5Cu-Mn cast aluminum alloys as objects,effects of compound refiners on the macro-structure and microstructure of α-Al as well as the action mechanism were investigated.The results indicate that the single-phase L12-Al67Cu8Ti25 compound particles are fabribated by sintering the powder at 600℃.With the increase of milling time,the average size of sintered compounds is decreased to 11 μm,and the morphology tends to be spherical.Al-25Al67Cu8Ti25 compound refiner has a desirable refining effect on α-Al,and the grain size of pure aluminum and Al-5Cu-Mn alloys are refined to 224 μm and 137 μm,respectively,after adding 0.25%Al67Cu8Ti25 compound refiner.L12-Al67Cu8Ti25 compound can act as an effective nucleation of α-Al with a mismatch degree of 2.35%,which is less than that of Al3Ti,leading to stronger heteronuclear ability.
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