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采用喷射成形技术制备了不同Zn含量的7×××系超高强铝合金,研究了Zn含量对材料的显微组织及室温力学性能的影响。结果表明:喷射成形工艺可显著细化晶粒,有效抑制合金内的偏析,获得细小、均匀的等轴晶组织,采用相同工艺制备的不同Zn含量的材料的晶粒尺寸为10~20μm。喷射成形制备的7×××系超高强铝合金中的主要组成相为:α(Al)、六方晶格的MgZn2、四方晶格的Al2Cu和面心斜方晶格的Al2CuMg。Zn含量在9.5%~11.5%时,经过适当的热处理,材料的强度可以达到800MPa以上。综合考虑材料的组织和性能,确定喷射成形7×××系铝合金中的Zn含量应控制在9.5%~11.5%。
The 7 ××× super high strength aluminum alloy with different Zn content was prepared by spray forming technique. The effect of Zn content on the microstructure and mechanical properties at room temperature was studied. The results show that the spray forming process can significantly refine the grains and effectively inhibit the segregation in the alloy to obtain fine and uniform equiaxed grains. The grain sizes of the materials with different Zn contents prepared by the same process are 10-20 μm. The main constituents of the 7 ××× series super-high-strength aluminum alloy prepared by spray molding are α (Al), hexagonal MgZn2, tetragonal Al2Cu and face-centered orthorhombic Al2CuMg. Zn content of 9.5% to 11.5%, after proper heat treatment, the strength of the material can reach 800MPa or more. Considering the organization and properties of the material, the Zn content in the spray-molded 7 ××× aluminum alloy should be controlled at 9.5% ~ 11.5%.