(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，
北京 100088)
摘 要: 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10～20 μm。 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800 MPa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%。
关键字: 7×××系高强铝合金; 喷射成形； 显微组织; 力学性能
（ State Key Laboratory of Fabrication and Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract: The ultra-high strength aluminum alloys with high Zn content were prepared by spray forming technology, and the microstructure and properties of alloys were studied. The results show that the as-deposited materials reveal a spheroid grain morphology with an average grain size of 10-20 μm. XRD analysis results indicate that the as-deposited alloys consist of α(Al), MgZn2, Al2Cu and Al2CuMg phases. The ultimate tensile strength of the alloy with 9.5%-11.5% Zn content can get to 815 MPa after T6 heat treatment. Based on the microstructure and properties, the Zn content should be controlled between 9.5% and 11.5%.
Key words: ultrahigh-strength aluminum alloy; spray forming technology; microstructure; mechanical property
