(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 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%。
关键字: Al-Zn-Mg-Cu-Zr-Yb合金；Al3(Zr,Yb)；再结晶；力学性能；断裂韧性
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: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 Al3(Zr,Yb) dispersoids with coherent L12 structure; Compared with Al3Zr dispersoids in Al-Zn-Mg-Cu-Zr, Al3(Zr,Yb) dispersoids could effectively inhibit recrystallization, resulting in the increase of yield strength and fracture toughness by 6% and 35%, respectively.
Key words: Al-Zn-Mg-Cu-Zr-Yb alloy; Al3(Zr,Yb); recrystallization; mechanical characteristics; fracture toughness
