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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 2    April 2007

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Effect of homogenization treatment on microstructure
and hot workability of high strength
7B04 aluminium alloy
WANG Tao(王 涛)1, 2, YIN Zhi-min(尹志民)1, SUN Qiang(孙 强)2

1. School of Materials Science and Engineering, Central South University,
Changsha 410083, China;
2. Northeast Light Alloy Co. Ltd, Harbin 150060, China

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 ℃, the starting melting temperature of the primary eutectics in ingot of non-equilibium solidified 7B04 alloy is 478 ℃. Using two-step homogenization processing at ultra-high temperature which comprises heating the ingots to 470 ℃ at 10 ℃/h and holding for 64 h, and then heating to 500 ℃ at 1 ℃/h and holding for 10 h, the ingots of 7B04 aluminium alloy could safely pass the sensitive overburnt zone between 480 ℃ and 495 ℃, and the ordinary burnt phenomena of the ingots between 480 ℃ and 495 ℃ 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.

 

Key words: 7B04 aluminium alloy; homogenization; low-melting point eutectic phases; overburnt temperature

ISSN 1672-7029
CN 43-1423/U

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