| ［Article ID］ 1003-6326(2001)06-0822-04
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
［CLC number］ TG146.2
［Document code］ A
［Foundation
item］ Project
(G19999064911) supported by the National Key Fundamental Research Development Program
［Received date］ 2001-05-08；
［Accepted date］ 2001-07-20 |