THERMO-MECHANICAL TREATMENT OF 2O91 Al-Li ALLOY

Acta Metall Sin

1991, Vol. 27

Issue (2): 52-58 DOI:

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THERMO-MECHANICAL TREATMENT OF 2O91 Al-Li ALLOY

YIN Zhimin;CHEN Xiaoqun;ZHANG Siqi;ZHANG Weibin Central South University of Technology; Changsha

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YIN Zhimin;CHEN Xiaoqun;ZHANG Siqi;ZHANG Weibin Central South University of Technology; Changsha. THERMO-MECHANICAL TREATMENT OF 2O91 Al-Li ALLOY. Acta Metall Sin, 1991, 27(2): 52-58.

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Abstract The effect of cold rolling prior to aging and two-step aging treatmenton the microstructure and mechanical properties of 2091 Al-Li alloy has been inves-tigated. The superior strength-ductility of the alloy may be matched by the treat-ment of 8% prior cold rolling and subsequently 170℃, 6h+190℃, 4 h double agingafter solid solutioning. The principal reasons for improving the strength-ducti-lity of the alloy are the suitable particle size of σ′ (Al_3Li), the dispersal precipita-tion of second strengthening phase S′ (Al_2CuMg) along dislocation substructures in-troduced by cold rolling, the decrease of equilibrium phase precipitated and thenarrowing σ′ precipitate free zone at grain boundary.

Key words: Al-Li alloy thermo-mechanical treatment microstructure mechanical properties

Received: 18 February 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I2/52

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