Al-Cu-Mg硬鋁合金TIG焊焊接接頭的組織與力學性能
發(fā)布時間:2019-01-04 16:44
【摘要】:為了研究Al-Cu-Mg硬鋁合金TIG焊焊接接頭的組織與力學性能,采用ER4043焊絲對2A12硬鋁合金進行了焊接實驗.利用光學顯微鏡、掃描電子顯微鏡、透射電子顯微鏡、能譜分析儀和硬度計對Al-Cu-Mg硬鋁合金的組織和力學性能進行了表征.結(jié)果表明,焊縫的強度和塑性較低,焊縫邊緣為柱狀晶,中心為枝晶組織,晶界存在大量低熔點共晶體.近縫區(qū)存在明顯的晶界液化現(xiàn)象,晶粒為圓潤的等軸晶,焊縫的硬度大幅度下降.固溶區(qū)焊縫的硬度和母材相近,基體中存在大量的針狀S'相,可對該區(qū)域起到強化作用.過時效區(qū)基體軟化現(xiàn)象比較嚴重,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.
【作者單位】: 沈陽工業(yè)大學材料科學與工程學院;
【基金】:遼寧省博士啟動基金資助項目(20131017) 遼寧省教育廳基金資助項目(201124125)
【分類號】:TG457.14
本文編號: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.
【作者單位】: 沈陽工業(yè)大學材料科學與工程學院;
【基金】:遼寧省博士啟動基金資助項目(20131017) 遼寧省教育廳基金資助項目(201124125)
【分類號】:TG457.14
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