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An Investigation on the Diffusion Welding of Aluminum to Copper Using ECAE Process

Eslami, Peyman | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41273 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali
  7. Abstract:
  8. A new method for production of bimetallic rods, utilizing the equal channel angular extrusion (ECAE) process has been introduced before by previous researchers, but no attempt has been made to assess the effect of different temperatures and holding times in order to achieve a diffusional bond between the mating surfaces. In present research copper sheathed aluminum rods have been ECAEed at room temperature and subsequently held at a constant ECAE pressure, at different temperatures and holding times to produce a diffusional bond between the copper sheath and the aluminum core. The bonding quality of the joints was examined by shear strength test. The microstructure examinations were carried out using scanning electron microscope (SEM) equipped with EDX system and X-ray diffraction (XRD) analysis. Results were used to explain the joint shear strength values fluctuations. Based on the results, a bonding temperature of 200 °C and holding time of 60-100 min yielded the highest shear strength value. It was also found that the bonding mechanism is related to the struggle between the mating surfaces oxidation rate accompanied by intermetallic compounds formation and the aluminum and copper atoms ability to diffuse in the joint interface. A sound bonding interface with a remarkable joint shear strength achieved using this new technique in bimetallic rods production
  9. Keywords:
  10. Aluminum ; Copper ; Equal Channel Angular Extrusion (ECAE) ; Diffusion bonding ; Bonding Temperature ; Holding Time

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