采用透射电子显微镜,研究含钪Al-Zn-Mg-Cu-Zr系铸态合金在退火过程中二次Al3(Sc,Zr)粒子的析出形貌、尺寸及分布.结果表明:含0.20%Sc的7系铝合金铸态试样在450 ℃退火2 h后,α(Al)基体内析出呈豆瓣状的二次Al3(Sc,Zr)粒子;在450 ℃退火32 h后,Al3(Sc,Zr)粒子尺寸为16～23 nm;在450 ℃退火32 h后的二次Al3(Sc,Zr)相与α(Al)基体完全共格.
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