首页|Sub-Rapid-Solidification Dominated Microstructure Modification and Strength Increment for Wire-Arc Directed Energy Deposited Al-Ce-Mg Alloys
Sub-Rapid-Solidification Dominated Microstructure Modification and Strength Increment for Wire-Arc Directed Energy Deposited Al-Ce-Mg Alloys
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Conventional cast Al-Ce alloys are challenged by the increasing demand for improved mechanical properties.To address this issue,in this study,wire-arc directed energy deposition(WA-DED)is employed for the fabrication of Al-15Ce-3Mg(wt％)alloy components.We aimed to tune the microstructure and mechanical properties via the inherent sub-rapid-solidification effect of WA-DED.In addition to significant microstructure refinement,a decrease in arc heat input leads to a larger cooling rate,up to 346 ℃/s,and triggers the transition from hyper-eutectic to near-eutectic a-Al/Al11Ce3 microstructures with the suppression of primary Al11Ce3 intermetallics.Such microstructural modification improves the mechanical properties,resulting in higher yield and ultimate tensile strengths than those of the as-cast counterpart alloy.The fracture process involves the formation of dim-ples around Al11Ce3,cracking of large Al11Ce3 particles,and growth,merging,and fracture of pores.The strength increment is mainly contributed by particle-size strengthening mediated by microstructure refinement as well as the targeted formation of near-eutectic α-Al/Al11Ce3 microstructures.
Wire-arc directed energy depositionHeat-resistant aluminum alloyAl-Ce alloyRapid solidificationStrengthening
Yueling Guo、Yangyu Yan、Jinlong Hu、Qifei Han、Xinglong Di、Changmeng Liu
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School of Mechanical Engineering,Beijing Institute of Technology,Beijing,100081,China
Key Laboratory of Fundamental Science for Advanced Machining Technology,Beijing Institute of Technology,Beijing,100081,China
School of Materials Science and Engineering,Beijing Institute of Technology,Beijing,100081,China
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