TiAl/Ti_2AlNb放电等离子扩散接头的组织性能研究
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摘要
采用放电等离子扩散连接方法,对TiAl/Ti_2Al Nb合金进行了扩散连接,分析了焊接接头的显微组织和物相组成,并检测了焊接接头的拉伸强度和显微硬度。结果表明,放电等离子扩散焊可实现TiAl合金和Ti_2AlNb合金的无缺陷连接。焊接过程中Ti_2AlNb母材侧发生了O/α_2向B_2相转变,Ti_2AlNb热影响区由部分相变区、过渡区和完全相变区组成,TiAl母材侧显微形貌无明显变化,但有少量的α_2转变为α相;界面处组织由等轴的TiAl晶粒、(α+α_2)相和少Nb的B_2相构成;界面处显微硬度值最高;接头室温拉伸强度可达300 MPa。
TiAl/Ti_2AlNb dissimilar materials were successfully bonded by using spark plasma diffusion bonding technology.The microstructure and phase composition of the TiAl/Ti_2AlNb joint were analyzed,and the tensile strength and mircrohardness of the joint were tested.The results show that defect free joining of Ti Al alloy and Ti_2AlNb alloy can be realised by using spark plasma diffusion bonding.The phase transformation from O/α_2to B_2phase occurs at the side of Ti_2AlNb base metal,and the microstructure of Ti_2AlNb heat affected zone consists of partly phase transformation zone,transition zone and entirely phase transformation zone.The morphology of TiAl base metal has no obvious change,and a small amount ofα_2transforms toαphase.The microstructure of the interface consists of equiaxed TiAl grain,(α+α_2)phase and B_2phase containing a little Nb.The microhardness at the interface is the highest,and the tensile strength of the joint at room temperature can reach 300 MPa.
TiAl/Ti_2AlNb dissimilar materials were successfully bonded by using spark plasma diffusion bonding technology.The microstructure and phase composition of the TiAl/Ti_2AlNb joint were analyzed,and the tensile strength and mircrohardness of the joint were tested.The results show that defect free joining of Ti Al alloy and Ti_2AlNb alloy can be realised by using spark plasma diffusion bonding.The phase transformation from O/α_2to B_2phase occurs at the side of Ti_2AlNb base metal,and the microstructure of Ti_2AlNb heat affected zone consists of partly phase transformation zone,transition zone and entirely phase transformation zone.The morphology of TiAl base metal has no obvious change,and a small amount ofα_2transforms toαphase.The microstructure of the interface consists of equiaxed TiAl grain,(α+α_2)phase and B_2phase containing a little Nb.The microhardness at the interface is the highest,and the tensile strength of the joint at room temperature can reach 300 MPa.
引文
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[2]张永刚.金属间化合物结构材料[M].北京:国防工业出版社,2001.
[3] LeholmR,NorrisB,GurneyA,etal.High temperature alloys for aerospace structures[J]. Advanced Materials&Processes,2001,159(5):27-31.
[4] Djanarthany S,Viala J C,Bouix J. An overview of monolithic titanium aluminides based on Ti3Al and TiAl[J]. Materials Chemistry&Physics,2001,72(3):301-319.
[5]王彬,贺跃辉,黄伯云,等.TiAl基合金固态焊接的研究现状[J].材料导报,1998(5):16-18.
[6]陈国庆,冯吉才,何景山,等.TiAl基合金及其连接技术的研究进展[J].焊接,2007(1):16-20.
[7]Liu W,Naka M.In situ joining of dissimilar nanocrystalline materials by spark plasma sintering[J].Scripta Materialia,2003,48(9):1225-1230.
[8]Fukuzawa Y,Nagasawa S,Takaoka S.Bonding Strength of W-Cu Joint by PECS Method[J].Solid State Phenomena,2007,127:271-276.
[9]He D,Fu Z,Wang W,et al.Temperature-gradient joining of Ti-6Al-4V alloys by pulsed electric current sintering[J].Materials Science&Engineering A,2012,535(7):182-188.
[10]Liu Guoxi,Li Kezhi,Leng Xiaoxuan,et al.Fast welding of chromium carbide and nickel alloy by spark plasma sintering[J].Journal of Wuhan University of Technology(Materials Science),2016,31(4):835-837.
[11]吴波,沈剑韵,商顺利,等.Ti-22Al-27Nb合金平衡相结构预测[J].稀有金属,2002,26(1):12-14.
[12]Song H,Wang Z J.Grain refinement by means of phase transformation and recrystallization induce by eletropulsing[J].TransactionsofNonferrousMetalsSocietyofChina,2011,21(S2):353-357.
[13]Zou J Y,Cui Y Y,Yang R.Diffusion bonding of dissimilar intermetallic alloys based on Ti2AlNb and TiAl[J].Journal of Materials Science&Technology,2009,25(6):819-824.
[14]尹建明,卢斌,李玉兰,等.Ti2AlNb合金板材的电子束焊接[J].中国有色金属学报,2010,20(s1):325-330.