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Joining of 304 Stainless Steel to Semi Solid A356 Aluminum Alloy and Investigation of Interfacial Bond

Pakdaman, Pourang | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39577 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Aashuri, Hossein
  7. Abstract:
  8. A method of joining dissimilar metals in the semi solid state is presented. By this method bonding of Stainless steel and semisolid aluminum alloy took place in this research. By usage of thermomechanical treatment, dendritic microstructure of cast aluminum alloy changed to globular structure. The experimental process of bonding occurred at semisolid temperature stage of aluminum alloy in a predesigned mold by using a pressure equipment. The relationship between interfacial shear strength and solid fraction of aluminum alloy, bonding pressure and time of keeping pressure were studied by method of orthogonal experiment. By the usage of Taguchi method in designing experiments, plurality of experiments decreased and realization of results improved. Also it was a considerable time and money saving method. The interfacial structure and fracture structure of the bonding plate are studied by means of optical microscope (OM) and scanning electron microscope (SEM). The results show that there is the best solid fraction between the solid phase line and liquid phase line (fs = 50%) of the semisolid aluminum alloy, with the increase of bonding pressure and pressure time, the interfacial shear strength increases rapidly, and then with further increase of bonding pressure and pressure time, the shear strength rises little. Along the interface of stainless steel and aluminum alloy, solid phase and liquid phase of aluminum bond with stainless steel exists that a new type of non-equilibrium diffusion interfacial structure is constructed
  9. Keywords:
  10. Taguchi Method ; Stainless Steel ; Shear Strength ; Semi-Solid Processing ; Aluminum Alloy A356 ; Dissimilar Joint ; InterFacial Structure

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