鈦合金具有良好的機械強度、優(yōu)異的耐腐蝕性和較高的比強度等特性,在航空航天和飛機工業(yè)領域應用廣泛。鋁合金密度是鈦合金密度的2/3,在汽車和運輸行業(yè)具有巨大的減重潛力。目前,環(huán)境保護和節(jié)能減排是亟需解決的重大問題,而通過焊接方法獲得鋁合金與鈦合金的復合構件,可以綜合二者的優(yōu)點,有效減少汽車和飛機等部件的重量。因此,鈦/鋁焊接具有很大的應用前景。本研究采用鎢極惰性氣體保護焊（GTAW）和AlSi12焊絲對5052鋁合金和Ti6Al4V鈦合金板材進行了高效連接。研究了Al5052/Ti6Al4V的焊接機理,探討了焊接熱輸入對接頭組織,拉伸性能和斷裂行為的影響。取得主要研究成果如下:采用AlSi12焊絲進行了Al5052/Ti6Al4V搭接焊接研究。焊接接頭分別表現(xiàn)出熔焊和釬焊的雙重特征,分別表現(xiàn)在接頭的鋁合金和鈦合金母材上。釬焊區(qū)形成了連續(xù)反應層,EDS成分分析結果表明,該反應層為Ti（Al,Si）₃金屬間化合物（IMC）層,該物相中部分Al原子被Si原子所取代。隨著焊接熱輸入的增加,反應層厚度從1μm增加到3.5μm。進一步通過EPMA分析確定了焊縫和IMC層中鋁、鈦、... 

【文章來源】：大連理工大學遼寧省 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：64 頁

【學位級別】：碩士

【文章目錄】：
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
結論
References
Publications in Master Study
Acknowledgement


【參考文獻】：
期刊論文
[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]鋁/鈦異種合金激光熔釬焊接頭特性[J]. 倪加明,李俐群,陳彥賓,封小松.  中國有色金屬學報. 2007(04)



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