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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 6    December 2001

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Effect of minor Sc and Zr on microstructures and
mechanical properties of Al-Zn-Mg based alloys
YIN Zhi-min(尹志民), YANG Lei(杨  磊),
PAN Qing-lin(潘青林), JIANG Feng(姜  锋)

Department of Materials Science and Engineering,
Central SouthUniversity,Changsha 410083, P.R.China

Abstract: Two kinds of Al-Zn-Mg based alloys with and without Sc, Zr addition were prepared by ingot metallurgy. The tensile mechanical properties and microstructures of the studied alloys at different treatment conditions were studied. The results show that addition of minor Sc and Zr can remarkably improve the strength of Al-Zn-Mg based alloys, but the ductility remains on a higher level. The strength increment is mainly due to fine-grain strengthening, substructure strengthening and precipitation strengthening of Al3(Sc,Zr).

 

Key words:  aluminum alloy; Sc; Zr; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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