3(Sc,Zr)相抑制主強化相η'相的析出，隨著合金中鈧含量的增加抑制效果更為明顯，從而弱化析出強化效果；合金晶粒的細化有利于拉伸過程形成更多更細小的韌窩，提升板材延伸率；鈧含量為0.02%Sc的合金在經過軋制+T6熱處理后綜合力學性能優(yōu)良，其抗拉強度為683 MPa、延伸率為21%。;The relationship between the mechanical properties and precipitation behavior of Al-Zn-Mg-Cu-Zr aluminum alloys with low Sc content (0.02wt%, 0.07wt%, 0.12wt%) was investigated by OM, SEM, TEM, and universal material testing machine. With the increase in Sc content, microstructure of as-cast alloy is gradually refined, and the coarse secondary phase at the grain boundary increases, thus weakening the effect of fine grain strengthening. In the alloy at rolling+T6 state, the Al3(Sc,Zr) phase inhibits the precipitation of the main strengthening phase η', and the inhibition effect becomes more obvious with the increase in Sc content, thus weakening the precipitation strengthening effect. The grain refinement is conducive to the formation of more and finer dimples during the tensile deformation, thus improving the ductility of the alloy. The low Sc content alloy (0.02wt%) shows the excellent mechanical properties after rolling and T6 heat treatment, whose tensile strength and elongation are 683 MPa and 21%, respectively."/>
3(Sc,Zr)相;scandium (Sc);aluminum alloy;rolling;mechanical properties;Al3(Sc,Zr) phase"/>