Al5052/Ti6Al4V钨极氩弧焊搭接接头微观组织及力学性能研究

发布时间：2021-08-01 14:48

　　钛合金具有良好的机械强度、优异的耐腐蚀性和较高的比强度等特性,在航空航天和飞机工业领域应用广泛。铝合金密度是钛合金密度的2/3,在汽车和运输行业具有巨大的减重潜力。目前,环境保护和节能减排是亟需解决的重大问题,而通过焊接方法获得铝合金与钛合金的复合构件,可以综合二者的优点,有效减少汽车和飞机等部件的重量。因此,钛/铝焊接具有很大的应用前景。本研究采用钨极惰性气体保护焊（GTAW）和AlSi12焊丝对5052铝合金和Ti6Al4V钛合金板材进行了高效连接。研究了Al5052/Ti6Al4V的焊接机理,探讨了焊接热输入对接头组织,拉伸性能和断裂行为的影响。取得主要研究成果如下:采用AlSi12焊丝进行了Al5052/Ti6Al4V搭接焊接研究。焊接接头分别表现出熔焊和钎焊的双重特征,分别表现在接头的铝合金和钛合金母材上。钎焊区形成了连续反应层,EDS成分分析结果表明,该反应层为Ti（Al,Si）₃金属间化合物（IMC）层,该物相中部分Al原子被Si原子所取代。随着焊接热输入的增加,反应层厚度从1μm增加到3.5μm。进一步通过EPMA分析确定了焊缝和IMC层中铝、钛、... 

【文章来源】：大连理工大学辽宁省 211工程院校 985工程院校 教育部直属院校

【文章页数】：64 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
1 Introduction
    1.1 Research Background
    1.2 Characteristics and properties of aluminum and titanium alloys
        1.2.1 Aluminum alloys
        1.2.2 5052 aluminum alloy
            1.2.3 Titanium alloys
            1.2.4 Ti6Al4V titanium alloy
        1.3 Characteristics and advantages of Gas tungsten arc welding (GTAW) process
            1.3.1 GTAW process
            1.3.2 Advantages of GTAW
        1.4 Research status of dissimilar Al/Ti alloy welding
        1.5 Research objectives and research content of the Al/Ti dissimilar joining by GTAW
            1.5.1 Main research objectives
            1.5.2 Main research contents
2 Experimental
    2.1 Experimental Materials
    2.2 Experimental Method
        2.2.1 Preparation before welding
        2.2.2 Experimental Process
    2.3 Microstructural examination of Al5052/Ti6Al4V welded joint
        2.3.1 Optical microscopy (OM)
        2.3.2 Scanning Electron Microscopy (SEM)
        2.3.3 Electron Probe Micro analysis (EPMA)
    2.4 Mechanical test methods
        2.4.1 Tensile Test
        2.4.2 Microhardness test
3 Lap joining Al5052 to Ti6Al4V by GTAW with Al Si12 filler wire
    3.1 Appearance of the weld
    3.2 Macrostructure and optical microstructure
    3.3 Interfacial microstructures
    3.4 Distribution of alloying elements
    3.5 Tensile-shear strength
    3.6 Microhardness
    3.7 Fracture analysis
    3.8 Summary
4 Lap joining Al5052 to Ti6Al4V by GTAW with Al Si5 filler wire
    4.1 Macroscopic cross-section of the joint
    4.2 Optical microstructures
    4.3 Microstructure of Al5052/Ti6Al4V brazed zone
    4.4 Electron Probe microanalysis (EPMA)
    4.5 Mechanical properties
    4.6 Fracture mechanism
    4.7 Summary
Conclusions
结论
References
Publications in Master Study
Acknowledgement


【参考文献】：
期刊论文
[1]Microstructure Evolution and Tensile Properties of Ti3Al/Ni-based Superalloy Welded Joint[J]. Bingqing Chen,Huaping Xiong,Bingbing Sun,Siyi Tang,Shaoqing Guo,Xuejun Zhang.  Journal of Materials Science & Technology. 2014(07)
[2]Effect of Brazing Conditions on Microstructure and Mechanical Properties of Al2O3/Ti—6Al—4V Alloy Joints Reinforced by TiB Whiskers[J]. Minxuan Yang,Peng He,Tiesong Lin.  Journal of Materials Science & Technology. 2013(10)
[3]铝/钛异种合金激光熔钎焊接头特性[J]. 倪加明,李俐群,陈彦宾,封小松.  中国有色金属学报. 2007(04)



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