用金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)及显微硬度仪研究了Sc含量对A1-5.5Mg-0.5Mn-Sc-0.1Zr(质量分数,％)(0.05≤X≤0.50)合金铸态显微组织和时效处理后二次析出相的形貌及其强化作用的影响.结果表明:当Sc含量少于0.09％(质量分数,下同)时,凝固过程中无含Sc相析出,铸锭组织为柱状树枝晶,时效后强化作用有限;当Sc含量在0.16％～0.23％时,凝固过程中析出少量初生及共晶A13(Sc,Zr)相,这既能够细化晶粒,又不影响时效后二次析出相的热稳定性,时效后合金的硬度也较高;而Sc含量过高(X≥0.23)时,合金中初生和共晶A13(Sc,Zr)相的含量增多,虽然也能够细化晶粒,但凝固后基体中固溶的Zr含量也会随之降低,导致二次A13(Sc,Zr)相的热稳定性降低,450℃时效24 h后二次析出相粗化严重,强化作用很弱.
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