Study of Microstructure and Mechanical Properties of Aluminum Bronze Joint by Friction stir welding

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Saboktakin Rizi, Mostafa | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42777 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Kokabi, Amir Hossein
Abstract:
Microstructural characteristics and mechanical properties of a friction stir welded cast Aluminum Bronze (Cu–9Al–1Fe), produced through sand casting method, have been investigated in this study at tool rotation of 850–1500 rpm and traverse speed of 50–100mm/min. The study also describes results obtained from microstructure evolution (optical microscopy and Clemex image analysis software) and mechanical properties of Aluminum Bronze welds produced by FSW process. Refinement of the primary coarse cast microstructure and elimination of the defects in base metal due to porosity and casting was seen clearly after friction stir welding. Microstructure of the stir zone was divided into four distinct areas of non-isometric fine grains while significant grain growth was also noticed in some areas. Conditions of grain growths are provided in high heat input intensity and low heat transfer capability. The measured microhardness within cross and vertical-sections of the welded joints was increased with decrease in the grain size (consistent with Hall-Petch relationship) although the microhardness of BM, HAZ, TMAZ and other weld zones varied considerably.
Keywords:
Microstructure ; Aluminum Bronze ; Mechanical Properties ; Friction Stir Welding

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