Sub-Rapid-Solidification Dominated Microstructure Modification and Strength Increment for Wire-Arc Directed Energy Deposited Al-Ce-Mg Alloys  

作　　者：Yueling Guo Yangyu Yan Jinlong Hu Qifei Han Xinglong Di Changmeng Liu 

机构地区：[1]School of Mechanical Engineering,Beijing Institute of Technology,Beijing,100081,China [2]Key Laboratory of Fundamental Science for Advanced Machining Technology,Beijing Institute of Technology,Beijing,100081,China [3]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing,100081,China

出　　处：《Additive Manufacturing Frontiers》2024年第2期158-168,共11页增材制造前沿(英文)

基　　金：supported by National Natural Science Foundation of China(Grant No.52105319);The authors are grateful to the Analysis&Testing Center and the Micro-and Nanotechnology Center at the Beijing Institute of Technology for performing the XRM experiments.

摘　　要：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°C/s,and triggers the transition from hyper-eutectic to near-eutecticα-Al/Al_(11)Ce_(3)microstructures with the suppression of primary Al_(11)Ce_(3)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 Al11 Ce3,cracking of large Al11 Ce3 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-eutecticα-Al/Al_(11)Ce_(3)microstructures.

关 键 词：Wire-arc directed energy deposition Heat-resistant aluminum alloy Al-Ce alloy Rapid solidification Strengthening 

分 类 号：TG1[金属学及工艺—金属学]