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논문 기본 정보

자료유형
학술저널
저자정보
Satya Kumar Dewangan (National Institute of Technology Raipur) M. K. Tripathi (National Institute of Technology Raipur) M. K. Manoj (National Institute of Technology Raipur)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.5
발행연도
2022.5
수록면
1,169 - 1,183 (15page)
DOI
10.1007/s12540-021-00980-1

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초록· 키워드

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Friction Stir Welding (FSW) has great potential over fusion welding for joining dissimilar alloys. However, formation ofintermetallic compounds (IMCs) Al12Mg17and Al3Mg2in FSW of Al/Mg alloys is almost unavoidable and problematic forthe research community. Such IMCs in the form of continuous layer provide easy crack propagation path which increasesbrittleness and reduces the joint strength of the weld. To improve the material flow behavior and reducing brittleness, accurateand precise attempts were taken to join two dissimilar alloys i.e. Al 7075 and Mg AZ31 with the incorporation of cadmiuminterlayer first time. Tool rotational speed of 1300 rpm and traverse speed of 20 mm/min were maintained throughout thewelding process. Various phase formation and their distribution in the nugget zone has been studied in details by using opticalmicroscopy, SEM?EDS and XRD. The supersaturated solid solution (SSSS) of Mg in Al, and a thin layer of Al3Mg2andsmall particles (~ 1 μm) of Al12Mg17have been observed in the stir zone. During processing Cd reacted with Mg and formedCdMg and CdMg3which have been distributed in the upper-middle portion of Mg region as intercalated lamellar structure. Formation of these compound provided micro-mechanical interlocking. Further, Al material has been found to be depositedinto the Mg region in the form of elongated balloon which provided anchoring effect due to mechanical interlocking. Themaximum tensile strength achieved is 129 MPa which is higher than the previously reported dissimilar FSW of Al 7xxxseries alloy with Mg alloy. Fractographic study of the dissimilar FSW tensile sample was carried out to understand crackpropagation path and scope for further improvement in the weld joint strength.

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