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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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Microstructure and mechanical properties of friction stir butt welded dissimilar Cu/CuZn30 sheets

Barlas Z., Uzun H.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 30, nr 2

182-186

Purpose: The aim of the study is to show the feasibility for joining of dissimilar commercial pure copper sheet to brass (CuZn30) sheet by friction stir welding (FSW). Design/methodology/approach: In this study, dissimilar Cu and CuZn30 sheets was butt joined by FSW. It has been investigated microstructure properties, microhardness, tensile and bending tests, in order to evaluate the joint performance and the weld zone characteristics of dissimilar copper/brass (Cu/CuZn30) joints. Findings: The tensile strength of dissimilar Cu/CuZn30 joints was found to be about same and 46% lower than that of Cu parent metal (PM) and CuZn30 PM, respectively. The root and the surface bend strengths of the joints were found to be about 47% higher and 31% lower than that of Cu PM and CuZn30 PM, respectively. The average hardness at the top and bottom lines were found to be about 92 Hv0.1 and 102 Hv0.1, respectively. These hardness values are higher and lower than that of Cu PM and CuZn30 PM, respectively. Different microstructure zones were determined by optical microscopy. It was illustrated that the stirred zone (SZ) exposed to the two main structures: (1) recrystallized grains of CuZn30 and (2) intercalated swirl and vortex-like structure which can be characterized both the recrystallized brass grains and copper layers. Research limitations/implications: In this study, the limited FSW parameters were employed. Further studies are needed to evaluate the effects of welding parameters of dissimilar Cu/CuZn30 on the joining properties to establish the optimal weld parameters. Practical implications: FSW is successfully applied to the butt joining of dissimilar Cu and CuZn30 alloy sheets. Originality/value: This research is one of the preliminary studies on the detailed examinations of the microstructural and mechanical properties of the dissimilar Cu/CuZn joint by FSW.