微量元素对增材制造Al-Zn-Mg-Cu合金组织及性能的影响

Influence of trace elements on microstructure and mechanical properties of additive manufacturing of Al-Zn-Mg-Cu alloy

电弧增材制造铝合金构件及技术应用的潜力巨大,但是增材制造的高强铝合金通常存在着缺陷多、力学性能差的问题。文中以电弧增材制造Al-Zn-Mg-Cu合金为研究对象,探索微量Zr和Ti元素对成形合金的微观组织和力学性能的作用机制。研究结果表明,添加这些微量元素以后,可以在合金中析出Al_(3)(Zr,Ti)纳米亚稳相,并且细化晶粒组织,提高了合金的硬度、强度和塑性,提高了断口的韧性断裂比例,以及减少了合金中的气孔和裂纹缺陷。研究结果为增材制造铝合金材料的开发和设计提供了思路和参考。

There is a great potential in the application of wire and arc additive manufacturing of Al alloy components and the technology.However,the high-strength aluminum alloy made by additive manufacturing usually has issues like numerous defects and low mechanical properties.In this paper,Al-Zn-Mg-Cu alloys fabricated by wire and arc additive manufacturing was studied,and the effect mechanism of trace Zr and Ti elements on the microstructure and mechanical properties of the alloy was explored.The key results showed that the nanometer metastable Al_(3)(Zr,Ti)phase was precipitated in the alloy after adding these trace elements.Moreover,the grain structure could be refined,the hardness,strength and plasticity of the alloy could be improved,while the ductile fracture ratio of fracture surface could be increased,and the porosity and crack defects in the alloy could be reduced.The research results provided ideas and basis for the development and design of Al alloy materials for additive manufacturing.