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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 4    August 2003

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Effect of high-temperature pre-precipitation on microstructure and properties of 7055 aluminum alloy
CHEN Kang-hua(陈康华), HUANG Lan-ping(黄兰萍)

State Key Laboratory for Powder Metallurgy ,
Central South University, Changsha 410083, China

Abstract:The near-solvus pre-precipitation following higher temperature solution treatment was performed on 7055 aluminum alloy. The effect of the pre-precipitation on the microstructure, age hardening and stress corrosion cracking of 7055 alloy was investigated. The optical and transmission electron microscopy results show that the near-solvus pre-precipitation can be limited to grain boundary and enhance the discontinuity of grain boundary precipitates in the sequent age. The stress corrosion cracking resistance of aged 7055 alloys could be improved with non-deteriorated strength and plasticity via the pre-precipitation.

 

Key words:  7055 aluminum alloy; stress corrosion; precipitation; solution

ISSN 1672-7029
CN 43-1423/U

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