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논문 기본 정보

자료유형
학술저널
저자정보
Austine D. D’Souza (National Institute of Technology) Shrikantha S. Rao (National Institute of Technology) Mervin A. Herbert (National Institute of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.9
발행연도
2020.1
수록면
1,394 - 1,403 (10page)

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A vast majority of the research on friction stir welding(FSW) is mainly focused on welding of aluminium alloys. The researchstudies in this paper are based on one such alloy known as Al–Ce–Si–Mg aluminium alloy, of which, the microstructure andother mechanical properties of the friction stir welded joints are yet to be studied. The plates of Al–Ce–Si–Mg aluminiumalloy were friction stir welded using a non consumable, rotating tool with triangular profile pin and circular shoulder, withdifferent combinations of tool rotation speeds and weld speeds. The microstructure, hardness and mechanical properties ofthe weld were analyzed. The microstructure of the weld zones revealed that, the average grain size at the bottom of the NuggetZone (NZ) is 5 ± 0.12 μm and gradually increases to 15 ± 0.23 μm at the top of the NZ. In the TMAZ the grain size is20 ± 0.14 μm and is bigger compared to the NZ. In the HAZ, the grain size is around 37 ± 0.21 μm and is bigger than that inthe TMAZ. The maximum Vickers hardness value at the NZ center is 231.9 ± 2 Hv, and uniformly reduces to 100 ± 2.4 Hvin the TMAZ and 65 ± 1.3 Hv in the HAZ and then increases to 98 ± 1 Hv in the base material (BM). The maximum ultimatetensile strength (UTS) of FSW joint was found to be around 102.55 ± 3 MPa with elongation at fracture of 2.5%. The BMUTS was 154 ± 4.5 MPa. For a tool rotation speed of 800RPM and a weld speed of 20 mm/min a maximum joint efficiencyof 67%. was obtained. Hence these were chosen as the optimum process parameters to join the alloy Al–Ce–Si–Mg by FSW.

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