The effects of Sc and Zr microalloying on the microstructure and mechanical properties of a 7xxx Al alloy with high Cu content (7055) during casting, deformation, and heat treatment were investigated. The addition of Sc and Zr not only refined the grains but also transformed the θ-phase into the W-phase in the 7055 alloy. Minor Sc and Zr additions enhanced the hardness and yield strength of the 7055-T6 alloy by strengthening the grain boundaries and Al₃(Sc,Zr) precipitates. However, a further increase in the Sc and Zr fractions did not refine the grains but instead resulted in the formation of the large-sized W-phase and primary coarse Al₃(Sc,Zr) phase and subsequently deteriorated the mechanical properties of the alloys. The 7055 alloy with 0.25Sc addition exhibited the best mechanical property among the prepared alloys.

研究了Sc和Zr微合金化对高Cu含量（7055）的7xxx铝合金在铸造，变形和热处理过程中的组织和力学性能的影响。添加Sc和Zr不仅可以细化晶粒，而且还可以将7055合金中的θ相转变为W相。少量Sc和Zr的添加通过增强晶界和Al ₃（Sc，Zr）析出物来提高7055-T6合金的硬度和屈服强度。但是，Sc和Zr分数的进一步增加并不能使晶粒细化，反而导致了大尺寸W相和一次粗Al _{3的形成。}（Sc，Zr）相，随后使合金的机械性能下降。添加的0.25Sc的7055合金在所制备的合金中表现出最佳的机械性能。