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王杰,熊清莲,熊宴邻,张富淇,杨锦.瞬间液相(TLP)扩散连接GH4169/TC4接头微观结构及力学性能研究[J].稀有金属材料与工程(英文),2019,48(4):1275~1280.[Wang Jie,Xiong Qinglian,Xiong Yanlin,Zhang Fuqi and Yang Jin.The microstructure and mechanical properties of GH4169/TC4 joints prepared by transient liquid phase (TLP) diffusion bonding[J].Rare Metal Materials and Engineering,2019,48(4):1275~1280.]
The microstructure and mechanical properties of GH4169/TC4 joints prepared by transient liquid phase (TLP) diffusion bonding
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Received:July 08, 2018  Revised:August 20, 2018
DOI:
Key words: TC4 titanium alloy  GH4169 superalloy  transient liquid phase  diffusion bonding
Foundation item:国家自然科学基金资助(项目号51602269)和西南石油大学“过学术关”项目资助(项目号201499010006)
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Wang Jie,Xiong Qinglian,Xiong Yanlin,Zhang Fuqi and Yang Jin  
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Abstract:
      To expand titanium alloy and Ni-based superalloy application fields, the prepration of titanium alloy/Ni-based superalloy composite joints is necessary. In this study, transient liquid phase (TLP) bonding has been successfully developed to join TC4 and GH4169 using Ti/Ni composite foils as interlayer. The microstructure, mechanical properties and formation mechanism of joint were investigated. The interfaces, fracture, composition and phases of as-prepared TC4/GH4169 joints were analyzed by scanning electronic microscopy (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction(XRD), as well as shear strength and microhardness of joints were tested by universal testing machine and microhardness tester, respectively. The results showed that element interdiffusions and chemical reactions took place in the joining zone and multiple interlayer gradient structure, i.e. “Ni(s,s) / TiNi3/ Ti2Ni/ Ti/ Ti2Ni/ Ni/ TiNi”, was formed between GH4169 and TC4 under the process parameters of 960℃, 5MPa, 30min. The joint was compact with continuous interfacial bonding without obvious defects except some pores and microcracks exist in the interface of “Ni/ TiNi+Ti2Ni”. Hardness of each part of the prepared joint is not uniform, among them, the residual Ti and Ni interlayers have lower hardness, which is beneficial to alleviate the internal stress, the peak value appeared in the GH4169 side as a result of the formation of Ni(s,s) and TiNi3. Combined with the shear test, fracture morphology and phase analysis, the shear strength of as-prepared TC4/GH4169 joints achieved 124.6MPa and fracture occurs in the interface of “Ni/ TiNi+ Ti2Ni”, which presented a brittle characteristic.