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通过添加钪、锆， 调整铜量， 配制实验合金， 采用 Ｘ 射线衍射、透射电镜、扫描电镜、硬度测量、拉伸试验等手段研究了实验合金挤压棒材组织性能， 探讨了含钪、锆的 Ａｌ Ｃｕ Ｍｇ Ｆｅ Ｎｉ 系合金的强韧化机理。在２６１８ 铝合金中添加钪、锆使合金的组织性能得到了明显改善， 但钪、锆不宜过量。含钪、锆合金强韧化的原因在于， 一方面有 Ｌ１２ 型共格相 Ａｌ３（ Ｓｃ ， Ｚｒ） 生成， 起着有效的补充强化作用， 另一方面强化相 Ｓ′相细化和分布状况改观， 改变了裂纹萌生位置与扩展途径。
The microstructure and mechanical properties of extruded bar were studied by adding scandium and zirconium, adjusting the copper content, preparing the experimental alloy by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, hardness measurement and tensile test. Al-Cu-Mg-Fe Ni alloy toughening mechanism. Addition of scandium and zirconium to 2618 aluminum alloy has obviously improved the microstructure and properties of the alloy, but scandium and zirconium should not be overdosed. The reason for the strengthening and toughening of the scandium-containing zirconium alloy lies in the fact that Al3 (Sc, Zr), which is an L12-type coherent phase, is generated and plays an effective reinforcing effect on the one hand, and on the other hand, the refinement and distribution of the reinforcing phase S ’ , Changed the crack initiation location and expansion path.