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      Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys

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      Author(s)
      Ganjeh, E.
      Sarkhosh H.
      Bajgholi, M.E.
      Khorsand H.
      Ghaffari, M.
      Date
      2012
      Source Title
      Materials Characterization
      Print ISSN
      10445803
      Volume
      71
      Pages
      31 - 40
      Language
      English
      Type
      Article
      Item Usage Stats
      159
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      209
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      Abstract
      Microstructural features developed along with mechanical properties in furnace brazing of Ti-6Al-4V alloy using STEMET 1228 (Ti-26.8Zr-13Ni-13.9Cu, wt.%) and STEMET 1406 (Zr-9.7Ti-12.4Ni-11.2Cu, wt.%) amorphous filler alloys. Brazing temperatures employed were 900-950 °C for the titanium-based filler and 900-990 °C for the zirconium-based filler alloys, respectively. The brazing time durations were 600, 1200 and 1800 s. The brazed joints were evaluated by ultrasonic test, and their microstructures and phase constitutions analyzed by metallography, scanning electron microscopy and X-ray diffraction analysis. Since microstructural evolution across the furnace brazed joints primarily depends on their alloying elements such as Cu, Ni and Zr along the joint. Accordingly, existence of Zr 2Cu, Ti 2Cu and (Ti,Zr) 2Ni intermetallic compounds was identified in the brazed joints. The chemical composition of segregation region in the center of brazed joints was identical to virgin filler alloy content which greatly deteriorated the shear strength of the joints. Adequate brazing time (1800 s) and/or temperature (950 °C for Ti-based and 990 °C for Zr-based) resulted in an acicular Widmanstätten microstructure throughout the entire joint section due to eutectoid reaction. This microstructure increased the shear strength of the brazed joints up to the Ti-6Al-4V tensile strength level. Consequently, Ti-6Al-4V can be furnace brazed by Ti and Zr base foils produced excellent joint strengths. © 2012 Elsevier Inc. All rights reserved.
      Keywords
      Furnace brazing
      Mechanical properties
      Microstructure
      Ti-6Al-4V alloy
      XRD analysis
      Base metals
      Brazed joint
      Brazing temperature
      Brazing time
      Chemical compositions
      Eutectoid reaction
      Filler alloy
      Furnace brazing
      Joint strength
      Microstructural features
      Phase constitution
      Ti-6al-4v
      Ti-6Al-4V alloy
      Titanium-based
      Ultrasonic test
      XRD analysis
      Alloying elements
      Alloys
      Aluminum
      Amorphous alloys
      Brazing
      Cerium alloys
      Fillers
      Furnaces
      Joints (structural components)
      Mechanical properties
      Microstructural evolution
      Microstructure
      Scanning electron microscopy
      Titanium
      Ultrasonic testing
      X ray diffraction analysis
      Zirconium
      Titanium alloys
      Permalink
      http://hdl.handle.net/11693/21340
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.matchar.2012.05.016
      Collections
      • Department of Electrical and Electronics Engineering 3702
      • Institute of Materials Science and Nanotechnology (UNAM) 1930
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