Al-Zn-Mg-Cu-Zr-Yb铝合金中弥散相的形成和作用

Forming and effect of dispersoids in Al-Zn-Mg-Cu-Zr-Yb aluminum alloy

采用金相、能谱分析、扫描电镜、透射电镜和力学性能实验,研究Al-Zn-Mg-Cu-Zr-Yb铝合金中弥散相的形成以及弥散相对铝合金显微组织、再结晶行为、拉伸性能和断裂韧性的影响。结果表明:在Al-Zn-Mg-Cu-Zr-Yb合金中形成了大量、细小、分布均匀、与基体共格的L12型Al3(Zr,Yb)弥散相;与Al-Zn-Mg-Cu-Zr中形成的Al3Zr弥散相相比,Al3(Zr,Yb)弥散相能更有效地抑制合金变形固溶过程中的再结晶,合金屈服强度提高了6%,断裂韧性提高35%。

The forming and effect of dispersoids in Al-Zn-Mg-Cu-Zr-Yb aluminum alloy were studied by OM, EDS, SEM, TEM and mechanical properties tests. The results show that the Al-Zn-Mg-Cu-Zr-Yb alloy formed abundant homogeneous tiny A13（Zr,Yb） dispersoids with coherent L12 structure; Compared with A13Zr dispersoids in Al-Zn-Mg-Cu-Zr-Yb, A13（Zr,Yb） dispersoids could effectively inhibit recrystallization, resulting in the increase of yield strength and fracture toughness by 6% and 35%, respectively.