EFFECT OF Sc ON MICROSTRUCTURE AND PROPERTIES OF Al-Li-Cu-Mg-Zr ALLOY

Acta Metall Sin

1994, Vol. 30

Issue (8): 355-361 DOI:

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EFFECT OF Sc ON MICROSTRUCTURE AND PROPERTIES OF Al-Li-Cu-Mg-Zr ALLOY

JIANG Hiaojun; LI Yiyi; GUI Quanhong; MA Luming; LIANG Guojun; SHIChangxu(Institute of Metal Research; Chinese Academy of Sciences; Shenyang)

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JIANG Hiaojun; LI Yiyi; GUI Quanhong; MA Luming; LIANG Guojun; SHIChangxu(Institute of Metal Research; Chinese Academy of Sciences; Shenyang). EFFECT OF Sc ON MICROSTRUCTURE AND PROPERTIES OF Al-Li-Cu-Mg-Zr ALLOY. Acta Metall Sin, 1994, 30(8): 355-361.

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Abstract The effect of Sc on microstructure and tensile properties of Al-Li-Cu-Mg-Zr alloy has been studied. The results show that the δ′(Al3Li) and S′(Al_2CuMg) are main strengthening phases in the alloys-Addition of Sc may refine the grain size, reduce the coarsening rate of δ′particles and accelerate the precipitation and uniform distribution of S′phase obviously. Al_3Sc particles and composite Al_3Li / Al_3Sc particles precipitate in the Sc-containing alloys, they are beneficial to the improvement of properties. So,the Sc significantly increases the strength of the alloy, and results in superior combinations of strength and ductility.

Key words: Al-Li alloy microstructure tensile property strengthening

Received: 18 August 1994

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