Abstract: The ingot and homogenization microstructure of 3003 with various Mn, Fe content were investigated by electrical conductivity measurement and scanning electron microscopy. There were obvious Mn concentration in 3003 ingot and coarse primary particles, like α-Al(Fe,Mn)Si or Al6(Fe,Mn), around grain boundaries. When the Fe content of alloy increased from 0.12% (mass fraction) to 0.3%, the average grain size decreased from 257 μm to 108 μm, and the area fraction of primary particles rose from 1.28% to 3.75%. The alloy with higher Mn content exhibited lower electrical conductivity. During homogeneous heating stage, precipitation phase is mainly controlled by nucleation and growth process, which could be partially dissolved at higher temperature. During homogenization at 600 ℃, the precipitates were coarsened by Ostwald ripening process and long distance diffusion of manganese with enlargement in sized and reduction in quantity. There was precipitation free zone formed near the grain boundary during homogenization. With the increase of Mn content from 1.15% to 1.6%, the dissolution temperature of precipitates rose from 500 ℃ to 550 ℃. After 600 ℃ heat preservation for 12 h, a size increase from 149.0 nm to 342.5 nm of precipitates could be observed. The alloy with high Fe content and low Mn content (0.3% Fe, 1.15% Mn) showed uniform precipitation distribution in grains, while the alloy with low Fe content and high Mn content (0.12% Fe, 1.6% Mn) featured nonuniform precipitation distribution in grains. And there was small amount of precipitation in Mn-depleted areas like grain core and dendrite trunk.
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2018, Vol. 32 
