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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Strengthening-toughening of 7xxx series high strength aluminum alloys by heat treatment
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 effects of stepped solution heat treatments on the dissolution of soluble remnant constituents and mechanical properties of 7055 aluminum alloy were investigated. It was shown that a suitable pretreatment at lower temperature can enable complete dissolution of the constituent particles in 7055 alloy without overheating by subsequent high temperature solution treatment. This in turn increased the tensile strength and fracture toughness of 7055 alloy to 805MPa and 41.5MPa·m1/2 respectively, with approximately 9% tensile elongation. The near-solvus pre-precipitation following after high temperature solution treatment was also studied 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 transimission electron microscopy observation show that the near-solvus pre-precipitation can be limited to grain boundary and enhance the discontinuity of grain boundary precipitates in the subsequent ageing. The stress corrosion cracking resistance of aged 7055 alloy can be improved via the pre-precipitation with non-deteriorated strength and plasticity.

 

Key words:  aluminum alloys; 7000 series aluminum alloy; heat treatment; stress corrosion; precipitation

ISSN 1672-7029
CN 43-1423/U

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