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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 2    No. 4    November 1992

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EFFECT OF DOUBLE-AGING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF RS/PM Al-Li ALLOY
Jin Tounan, Yin Zhimin, Zhang Xinming, Deng Junyan

Central South University of Technology, Changsha 410083, China

Abstract:The effect of double-aging on the microstructure and mechanical properties of a RS / PM A1-Li alloy has been investigated. The results show that the ductility of the alloy can be greatly improved by the treatment of prior-aging at 170℃ For 4 h and second-step aging at 190℃ for 18 h after solid solutioning. The formation of a large amount of composite precipitates (AlLi3/Al3(Li,Zr)) with suitable size, narrowing of Fσ' (Al3Li) precipitate-free zone (PFZ) at grain boundaries and more dispersive precipitation of S' (A12CuMg) phases along substructures are responsible for the improvement of the ductility of the studied alloy.

 

Key words: AI-Li alloy  rapid solidification  double-aging

ISSN 1672-7029
CN 43-1423/U

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