Effect of Sc Content on the Microstructure and Properties of Al–Mg–Sc Alloys Deposited by Wire Arc Additive Manufacturing

Lingling Ren; Huimin Gu; Wei Wang; Shuai Wang; Chengde Li; Zhenbiao Wang; Yuchun Zhai; Peihua Ma

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자료유형: 학술저널

저자정보: Lingling Ren (Northeastern University) Huimin Gu (Northeastern University) Wei Wang (Inner Mongolia Metal Research Institute) Shuai Wang (Northeastern University) Chengde Li (Northeastern University) Zhenbiao Wang (East Industrial Materials & Metallurgy Co. Ltd) Yuchun Zhai (Northeastern University) Peihua Ma (Northeastern University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.1

발행연도: 2021.1

수록면: 68 - 77 (10page)

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Despite showing considerable potential, wire arc additive manufacturing (WAAM) has been limited to producing Al–Mgalloys. As the addition of Sc can improve the mechanical properties of Al–Mg alloys, in this study, Al–Mg–Sc alloy depositswith different Sc contents were prepared by a WAAM process. The porosity, microstructure, and mechanical properties ofthe deposits were studied. At Sc contents less than 0.15%, Sc was completely dissolved in the Al matrix without grain refinement,and the mechanical properties were slightly improved. At a Sc content of 0.3%, the primary Al3Scphase precipitatedout of the as-deposited body, resulting in an abrupt change in the microstructure, significant grain refinement, significantlyincreased tensile strength and yield strength, with a tensile strength, yield strength, and elongation of 372 MPa, 270 MPa,and 22.5%, respectively. Following heat treatment at 350 °C for 1 h, the grain boundaries were refined and the secondaryAl3Scphase was precipitated. Furthermore, the tensile strength and yield strength were significantly increased to 415 MPaand 279 MPa, respectively, and elongation decreased to 18.5%. At a Sc content of 0.45%, due to the aggregated precipitatedphase, the coarsened grain boundaries and the limited solid solution amount of Sc in the α(Al) matrix (~ 0.25%), themechanical properties were not further improved compared with the deposit with Sc content of 0.3%. Thus, based on economicconsiderations, the optimal Sc content was 0.3%. Owing to their enhanced mechanical properties, WAAM-producedAl–Mg–Sc alloys are expected to have a wide range of applications in aviation, aerospace.

#Al–Mg–Sc alloy · Sc content · Wire arc additive manufacturing · Microstructure · Mechanical properties

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