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      Evaluate of braze joint strength and microstructure characterize of titanium-CP with Ag-based filler alloy

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      Author
      Ganjeh, E.
      Sarkhosh H.
      Khorsand H.
      Sabet H.
      Dehkordi, E.H.
      Ghaffari, M.
      Date
      2012
      Source Title
      Materials and Design
      Print ISSN
      0264-1275
      Volume
      39
      Pages
      33 - 41
      Language
      English
      Type
      Article
      Item Usage Stats
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      162
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      Abstract
      This research investigates the influences of brazing parameters (temperature and time) on microstructures and the mechanical properties of commercially pure (CP) titanium sheet when it is brazed with CBS34 (Ag-20Cu-22Zn-24Cd) braze filler foil. Brazing was performed in a conventional atmosphere control furnace. The brazing temperatures and holding times employed in this study were 800-870°C and 10-20min, respectively. The qualities of the brazed joints were evaluated by ultrasonic test and the microstructure and phase constitution of the bonded joints were analyzed by means of metallography, scanning electron microscope (SEM) and X-ray diffraction (XRD). The mechanical properties of brazed joints were evaluated by microhardness and shear tests. The diffusion between Ti, Ag, Cu, Zn and Cd from substrate and braze alloy, developed a strong reaction between each other. A number of intermetallic phases, such as TiCu and Ti2Cu in the Ag-Zn solid solution matrix have been identified especially at 870°C - 20min. Both the brazing temperature and the holding time are critical factors for controlling the microstructure and hence the mechanical properties of the brazed joints. The optimum brazing parameters was achieved at 870°C - 20min. Based on the shear test result, all cracks propagate along the brittle intermetallic compounds like Ti2Cu in the reaction layer which typically are composed of quasi-cleavage (Ag-Zn matrix) and brittle appearance. © 2012 Elsevier Ltd.
      Keywords
      D. Brazing and soldering
      F. Microstructure
      G. Scanning electron microscopy
      Atmosphere controls
      Bonded joint
      Braze alloys
      Braze joints
      Brazed joint
      Brazing parameters
      Brazing temperature
      Commercially Pure titaniums
      Critical factors
      F. Microstructure
      Filler alloy
      G. Scanning electron microscopy
      Holding time
      Intermetallic phasis
      Optimum brazing parameters
      Phase constitution
      Quasi-cleavage
      Reaction layers
      Shear tests
      Solid solution matrices
      Ultrasonic test
      Cadmium alloys
      Fillers
      Intermetallics
      Mechanical properties
      Microstructure
      Quality control
      Rating
      Scanning electron microscopy
      Silver
      Silver alloys
      Titanium
      Ultrasonic testing
      X ray diffraction
      Zinc
      Brazing
      Permalink
      http://hdl.handle.net/11693/21378
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.matdes.2012.01.045
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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