Microstructure and mechanical properties of MoSi2-MoSi2 joints brazed by Ag-Cu-Zr interlayer

Hatami Ramsheh, H ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2013.01.027
  3. Publisher: Elsevier Ltd , 2013
  4. Abstract:
  5. The present work investigates joining of two MoSi2 parts through Cusil/Zr/Cusil interlayer with Cusil being a commercial eutectic of Cu-Ag alloy. The joining operation was implemented in an inert gas tube furnace by brazing. The brazing temperature ranged from 800 to 930°C while the operation lasted for 60min. Evaluation of joints strength through shear loading identified the maximum strength 60.31MPa for the brazed sample at 830°C. Interfacial microstructure was studied by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and X-ray Diffraction (XRD) techniques. Applying the temperature of 830°C was led to a uniform dense joint consisting of various phases with excellent bonding within the interfaces. XRD and EDS results revealed different phases such as Mo5Si3, Ag-rich solid solution and Cu10Zr7 at the interface. At higher brazing temperatures the amount of intemetallic compounds and residual stresses increased and therefore, mechanical properties of the joint degraded. The fracture analysis by SEM revealed various fracture path and morphology for different brazing temperatures
  6. Keywords:
  7. Energy dispersive spectroscopy ; Inert gases ; Joining ; Loading ; Mechanical properties ; Microstructure ; Phase interfaces ; Scanning electron microscopy ; Silver ; X ray diffraction ; Zirconium ; Brazing temperature ; Cu-Ag alloys ; Energy dispersive spectroscopies (EDS) ; Fracture analysis ; Fracture path ; GaS tubes ; Interfacial microstructure ; Maximum strength ; Microstructure and mechanical properties ; Molybdenum disilicide ; Shear loadings ; XRD ; Brazing
  8. Source: Materials and Design ; Volume 49 , August , 2013 , Pages 197-202 ; 02613069 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0261306913000411