Ti-48Al-2Cr-2Nb合金非晶钎焊接头组织和力学性能研究
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摘要
用Cu41.83Ti30.21Zr19.76Ni8.19非晶钎料对Ti-48Al-2Cr-2Nb合金进行真空钎焊连接,利用扫描电镜、能谱仪、X射线衍射以及万能试验机研究接头的显微组织和力学性能。结果表明:在钎焊温度为880、940、970℃,保温时间为600 s下实现了TiAl合金连接,钎缝主要由Ti2Al、AlCuTi、(Ti,Zr)2(Cu,Ni)和α-Ti组成;在一定的保温时间下,增加钎焊温度会导致接头剪切强度先增大后减小;当钎焊温度为940℃、保温时间为600 s,接头的剪切强度达到最大值,为266 MPa。反应层厚度影响接头剪切强度,为更好地控制反应层厚度,建立界面反应层生长动力学方程。
Ti-48Al-2Cr-2Nb alloys were brazed with Cu41.83Ti30.21Zr19.76Ni8.19 amorphous alloy filler.The microstructure and mechanical properties of the joint were analyzed by scanning electron microscopy,energy spectrometer,X-ray diffraction and testing machine.The results show that the TiAl alloy joints can be successfully achieved at the 880,940,970 ℃ for 600 s.The brazed joint is composed of Ti2Al,AlCuTi,(Ti,Zr)2(Cu,Ni)and α-Ti.The shear strength of the joint increases first and then decreases with the increase of brazing temperature.When brazed at temperature of 940 ℃ for 600 s,the joint shear strength reaches the maximum value of 266 MPa.The shear strength of the joint is affected by the thickness of the reaction layer.In order to better control the thickness of the reaction layer,the growth kinetic equation of the interface reaction layer was established.
Ti-48Al-2Cr-2Nb alloys were brazed with Cu41.83Ti30.21Zr19.76Ni8.19 amorphous alloy filler.The microstructure and mechanical properties of the joint were analyzed by scanning electron microscopy,energy spectrometer,X-ray diffraction and testing machine.The results show that the TiAl alloy joints can be successfully achieved at the 880,940,970 ℃ for 600 s.The brazed joint is composed of Ti2Al,AlCuTi,(Ti,Zr)2(Cu,Ni)and α-Ti.The shear strength of the joint increases first and then decreases with the increase of brazing temperature.When brazed at temperature of 940 ℃ for 600 s,the joint shear strength reaches the maximum value of 266 MPa.The shear strength of the joint is affected by the thickness of the reaction layer.In order to better control the thickness of the reaction layer,the growth kinetic equation of the interface reaction layer was established.
引文
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[3]何鹏,李海新,林铁松,等. TiAl基合金与Ni基合金钎焊连接接头界面组织及性能[J].稀有金属材工程,2013,42(11):2248-2252.
[4]周媛,熊华平,毛唯,等. TiAl与高温合金的扩散焊接头组织与性能[J].材料工程,2012(8):88-91.
[5]陈国庆,张秉刚,何景山,等. TiAl基合金电子束焊接头组织及转变规律[J].焊接学报,2007,28(5):81-84.
[6]熊华平,毛建英,陈冰清,等.航空航天轻质高温结构材料的焊接技术研究进展[J].材料工程,2013(10):1-12.
[7]熊华平,毛唯,陈波,等. TiAl基合金连接技术的研究进展[J].航空制造技术,2008(S1):108-112.
[8]李玉龙,冯吉才,何鹏,等. TiAl基合金钎焊技术研究现状及展望[J].焊接,2007(12):13-18.
[9]牛国宾,王东坡,杨振文,等. Al2O3陶瓷与TiAl合金真空钎焊接头界面组织及性能[J].稀有金属材料与工程,2017,46(11):3282-3287.
[10]刘加奇. TiAl/Ti2AlNb合金钎焊工艺与机理研究[D].哈尔滨:哈尔滨工业大学,2016.
[11]QIU Qiwen,WANG Ying,YANG Zhenwen,et al. Microstructure and mechanical properties of TiAl alloy joints vacuum brazed with Ti-Zr-Ni-Cu brazing powder without and with Mo additive[J]. Materials&Design,2016,90:650-659.
[12]CAI Y S,LIU R C,ZHU Z W,et al. Effect of brazing temperature and brazing time on the microstructure and tensile strength of TiAl-based alloy joints with Ti-Zr-Cu-Ni amorphous alloy as filler metal[J]. Intermetallics,2017,91:35-44.
[13]邹家生,许志荣,蒋志国,等. Ti-Zr-Ni-Cu非晶钎料[J].焊接学报,2005(10):51-53.
[14]REN H S,XIONG H P,CHEN B,et al. Vacuum brazing of Ti3Al-based alloy to TiAl using TiZrCuNi(Co)fillers[J].Journal of Materials Processing Technology,2015,224:26-32.
[15]宋晓国,曹健,王义峰,等. TiAl与Si3N4f/Si3N4复合材料钎焊接头界面结构及性能研究[J].稀有金属材料与工程,2012,41(7):1247-1250.
[16]HE P,FENG J C,ZHOU H. Microstructure and strength of brazed joints of Ti3Al-base alloy with TiZrNiCu filler metal[J]. Materials Science and Engineering A,2005,392:81-86.