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      Investigation on braze joint strength and microstructure of Ti-CP with Ag and Ti base filler alloys

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      Author
      Ganjeh, E.
      Khorsand H.
      Sarkhosh H.
      Ghaffari, M.
      Sabet H.
      Dehkordi, E.H.
      Date
      2012
      Source Title
      Proceeding of the 5th International Brazing and Soldering Conference
      Publisher
      American Welding Society
      Pages
      480 - 486
      Language
      English
      Type
      Conference Paper
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      Abstract
      This research investigates influences of brazing parameters (brazing alloy, temperature and time) on microstructures and mechanical properties of a commercially pure (CP) titanium sheet which is brazed with CBS 34 (Ag-based) and STEMET 1228 (Ti-based) braze-filler foils. Brazing was performed in a conventional inert furnace at temperature ranges of 800-870°C and 10-30 minutes for holding times. Qualities of the brazed joints were evaluated by ultrasonic testing, and then, microstructure and phase constitution of the bonded joints were analyzed by means of metallography, scanning electron microscope (SEM), and X-ray diffraction (XRD). Mechanical properties of brazed joints were evaluated by shear testing. Diffusion of titanium from substrate to filler alloy developed a strong reaction between them. A number of phases such as TiCu, Ti 2Cu, TiAg, Ag-Zn solid solution matrix (for Ag-based brazed samples) and Ti 2Cu, (Ti,Zr) 2Ni, Zr 2Cu (for Ti-based brazed samples) have been identified. The optimum brazing parameters were achieved at a temperature of 870 °C-20 min for CBS 34 and 870 °C-30 min for STEMET 1228. The specimen using STEMET 1228 braze alloy demonstrates best bonding strength (equal to Ti-CP tensile strength). Copyright 2012 ASM International® All rights reserved.
      Keywords
      Furnace brazing
      Intermetallic compounds
      Mechanical properties
      Microstructure
      Titanium
      Bonded joint
      Bonding strength
      Braze alloys
      Braze joints
      Brazed joint
      Brazing alloys
      Brazing parameters
      Commercially Pure titaniums
      Filler alloy
      Furnace brazing
      Holding time
      Microstructures and mechanical properties
      Optimum brazing parameters
      Phase constitution
      Shear testing
      Solid solution matrices
      Temperature range
      Alloys
      Brazing
      Cerium alloys
      Electric circuit breakers
      Fillers
      Intermetallics
      Mechanical properties
      Microstructure
      Quality control
      Scanning electron microscopy
      Silver
      Silver alloys
      Titanium
      Ultrasonic testing
      X ray diffraction
      Zirconium
      Titanium alloys
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      http://hdl.handle.net/11693/28213
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      • Institute of Materials Science and Nanotechnology (UNAM) 1841
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