Al-Zn-Mg-Cu超强铝合金多相组织调控及对性能的影响的中期报告.docxVIP

Al-Zn-Mg-Cu超强铝合金多相组织调控及对性能的影响的中期报告 摘要： Al-Zn-Mg-Cu超强铝合金是一种高强度、轻质、耐腐蚀的新型材料，在航空、汽车、船舶等重要领域具有广泛的应用前景。本研究通过多相组织调控来优化其力学性能和耐腐蚀性能。首先，采用拉伸实验和电化学极化测试研究样品的力学性能和耐腐蚀性能，并建立宏观力学性能和微观组织结构之间的关系；然后，采用X射线衍射仪、扫描电子显微镜和透射电子显微镜等手段对样品的多相组织进行表征和分析，寻找最优的组织结构参数。结果表明，在适当的热处理工艺条件下，可以得到由L12相、S相和粗大Grain的多相组织结构，其中L12相是提高抗拉强度的关键因素，而Grain的尺寸对强度和塑性均有影响。通过多次实验优化，得到了一种优化的多相组织结构，具有更高的强度和耐腐蚀性能。该研究对于Al-Zn-Mg-Cu超强铝合金的进一步发展和广泛应用具有重要的指导意义。 关键词：Al-Zn-Mg-Cu合金；超强铝合金；多相组织调控；力学性能；耐腐蚀性能 Abstract: Al-Zn-Mg-Cu super strong aluminum alloy is a new type of material with high strength, light weight and corrosion resistance, which has broad application prospects in aviation, automobile, shipbuilding and other important fields. In this study, the mechanical properties and corrosion resistance of the samples were optimized by multi-phase microstructure regulation. Firstly, the mechanical properties and corrosion resistance of the samples were studied by tensile test and electrochemical polarization test, and the relationship between macroscopic mechanical properties and microstructure was established. Then, the multi-phase microstructure of the samples was characterized and analyzed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy, and the optimal microstructure parameters were sought. The results showed that, under suitable heat treatment conditions, a multi-phase microstructure composed of L12 phase, S phase and coarse grain could be obtained, in which L12 phase was the key factor to improve tensile strength, and the grain size had an effect on strength and plasticity. Through multiple experiments and optimizations, an optimized multi-phase microstructure with higher strength and corrosion resistance was obtained. This study has important guiding significance for the further development and wide application of Al-Zn-Mg-Cu super strong aluminum alloy. Keywords: Al-Zn-Mg-Cu alloy; super strong aluminum alloy; multi-phase microstructure regulation; mechanical properties; corrosion r