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논문 기본 정보

자료유형
학술저널
저자정보
Anil Bandi (Indian Institute of Technology Madras) Srinivasa R. Bakshi (Indian Institute of Technology Madras)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.7
발행연도
2022.7
수록면
1,678 - 1,696 (19page)
DOI
10.1007/s12540-021-01039-x

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초록· 키워드

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The formation of Mg17Al12and Al3Mg2is inevitable even in solid-state joining of Al and Mg alloys by friction stir welding(FSW). In the present study, the effect of a thin inter-layer of Sn (tin) and FSW parameters (pin length and tool rotationspeed) on the microstructure and strength of friction stir lap welds of 3 mm thick AA6061 Al alloy and AZ31B Mg alloysheets was investigated. A ~ 20 μm thick Sn layer was deposited on AZ31B alloy by displacement plating. The heat generatedduring the welding melted the Sn layer and the rotation action of the tool pushed the molten Sn to the hooks on the advancingside and retreating side. The extent of Mg17Al12and Al3Mg2intermetallic compound formation was reduced with Sninter-layer with limited formation of Mg2Sn. The Sn inter-layer helped improve the lap shear strength at lower tool rotationalspeed (600 RPM) and pin lengths of 3.25 and 3.75 mm compared to joints without Sn inter-layer. Lap welds prepared witha 3.25 mm pin at 600 RPM had a lap shear strength of 245 N/mm which is the highest value reported so far and is 116%higher compared to joints without Sn inter-layer. This was due to elimination of hook at the advancing side and retreatingside and disintegration of intermetallic compounds.

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