(北京有色金屬研究總院 有色金屬材料制備加工國家重點實驗室,
北京 100088)
摘 要: 采用噴射成形技術制備了不同Zn含量的7×××系超高強鋁合金, 研究了Zn含量對材料的顯微組織及室溫力學性能的影響。 結果表明: 噴射成形工藝可顯著細化晶粒, 有效抑制合金內的偏析, 獲得細小、 均勻的等軸晶組織, 采用相同工藝制備的不同Zn含量的材料的晶粒尺寸為10~20 μm。 噴射成形制備的7×××系超高強鋁合金中的主要組成相為: 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%時, 經過適當的熱處理, 材料的強度可以達到800 MPa以上。 綜合考慮材料的組織和性能, 確定噴射成形7×××系鋁合金中的Zn含量應控制在9.5%~11.5%。
關鍵字: 7×××系高強鋁合金; 噴射成形; 顯微組織; 力學性能
ZHANG Zhi-hui, XIONG Bai-qing, SHI Li-kai
( 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


