Al-Cu-Mg硬铝合金TIG焊焊接接头的组织与力学性能
发布时间：2019-01-04 16:44
【摘要】：为了研究Al-Cu-Mg硬铝合金TIG焊焊接接头的组织与力学性能,采用ER4043焊丝对2A12硬铝合金进行了焊接实验.利用光学显微镜、扫描电子显微镜、透射电子显微镜、能谱分析仪和硬度计对Al-Cu-Mg硬铝合金的组织和力学性能进行了表征.结果表明,焊缝的强度和塑性较低,焊缝边缘为柱状晶,中心为枝晶组织,晶界存在大量低熔点共晶体.近缝区存在明显的晶界液化现象,晶粒为圆润的等轴晶,焊缝的硬度大幅度下降.固溶区焊缝的硬度和母材相近,基体中存在大量的针状S'相,可对该区域起到强化作用.过时效区基体软化现象比较严重,存在很多S(Al2Cu M g)相.
[Abstract]:In order to study the microstructure and mechanical properties of Al-Cu-Mg hard aluminum alloy TIG welded joint, ER4043 wire was used to weld 2A12 hard aluminum alloy. The microstructure and mechanical properties of Al-Cu-Mg aluminum alloy were characterized by optical microscope, scanning electron microscope, transmission electron microscope, energy spectrum analyzer and hardness tester. The results show that the strength and plasticity of the weld are low, the edge of the weld is columnar, the center of the weld is dendritic structure, and a large number of eutectic with low melting point exist in the grain boundary. There is obvious grain boundary liquefaction in the near seam region. The grain size is smooth equiaxed crystal and the hardness of weld decreases greatly. The hardness of the weld in the solution zone is similar to that of the base metal, and there are a large number of needle-like S 'phases in the matrix, which can strengthen the region. The softening of matrix in overaging zone is serious and there are many S (Al2Cu M g) phases.
【作者单位】： 沈阳工业大学材料科学与工程学院;
【基金】：辽宁省博士启动基金资助项目(20131017) 辽宁省教育厅基金资助项目(201124125)
【分类号】：TG457.14
本文编号：2400536
[Abstract]:In order to study the microstructure and mechanical properties of Al-Cu-Mg hard aluminum alloy TIG welded joint, ER4043 wire was used to weld 2A12 hard aluminum alloy. The microstructure and mechanical properties of Al-Cu-Mg aluminum alloy were characterized by optical microscope, scanning electron microscope, transmission electron microscope, energy spectrum analyzer and hardness tester. The results show that the strength and plasticity of the weld are low, the edge of the weld is columnar, the center of the weld is dendritic structure, and a large number of eutectic with low melting point exist in the grain boundary. There is obvious grain boundary liquefaction in the near seam region. The grain size is smooth equiaxed crystal and the hardness of weld decreases greatly. The hardness of the weld in the solution zone is similar to that of the base metal, and there are a large number of needle-like S 'phases in the matrix, which can strengthen the region. The softening of matrix in overaging zone is serious and there are many S (Al2Cu M g) phases.
【作者单位】： 沈阳工业大学材料科学与工程学院;
【基金】：辽宁省博士启动基金资助项目(20131017) 辽宁省教育厅基金资助项目(201124125)
【分类号】：TG457.14
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