Abstract
The effects of homogenization treatment on microstructure, overburnt temperature and hot rolling plasticity of high strength 7B04 aluminium alloy were investigated. Under the condition of homogenization at 470 °C, the starting melting temperature of the primary eutectics in ingot of non-equilibium solidified 7B04 alloy is 478 °C. Using two-step homogenization processing at ultra-high temperature which comprises heating the ingots to 470 °C at 10 °C/h and holding for 64 h, and then heating to 500 °C at 1 °C/h and holding for 10 h, the ingots of 7B04 aluminium alloy could safely pass the sensitive overburnt zone between 480 °C and 495 °C, and the ordinary burnt phenomena of the ingots between 480 °C and 495 °C does not occur because the excess low-melting point eutectic phases in the as-cast alloy dissolve into the matrix during the two-step homogenization processing. Consequently, the hot rolling plasticity of ingot of 7B04 aluminium alloy is greatly improved.
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