(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用金相、能譜分析、掃描電鏡、透射電鏡和力學性能實驗，研究Al-Zn-Mg-Cu-Zr-Yb鋁合金中彌散相的形成以及彌散相對鋁合金顯微組織、再結晶行為、拉伸性能和斷裂韌性的影響。結果表明：在Al-Zn-Mg-Cu-Zr-Yb合金中形成了大量、細小、分布均勻、與基體共格的L12型Al3(Zr,Yb)彌散相；與Al-Zn-Mg-Cu-Zr中形成的Al3Zr彌散相相比，Al3(Zr,Yb)彌散相能更有效地抑制合金變形-固溶過程中的再結晶，合金屈服強度提高了6%，斷裂韌性提高35%。
關鍵字: Al-Zn-Mg-Cu-Zr-Yb合金；Al3(Zr,Yb)；再結晶；力學性能；斷裂韌性
（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
