3D printing of fine-grained aluminum alloys through extrusion-based additive manufacturing:Microstructure and property characterization  

作　　者：Fengchao Liu Pingsha Dong Abdul Sayeed Khan Yuning Zhang Randy Cheng Alan Taub Zongyi Ma 

机构地区：[1]Department of Naval Architecture and Marine Engineering,University of Michigan,Ann Arbor,MI 48109,USA [2]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]Department of Mechanical Engineering,University of Michigan,Ann Arbor,MI 48109,USA [4]Department of Materials Science and Engineering,University of Michigan,Ann Arbor,MI 48109,USA

出　　处：《Journal of Materials Science & Technology》2023年第8期126-136,共11页材料科学技术（英文版）

基　　金：This work was financially supported by the University of Michi-gan College of Engineering startup grant and FL and PD acknowl-edge the technical support from the Michigan Center for Materials Characterization(MC^(2)).

摘　　要：Additive manufacturing(AM)has the potential to transform manufacturing by enabling previously un-thinkable products,digital inventory and delivery,and distributed manufacturing.Here we presented an extrusion-based metal AM method(refer to“SoftTouch”depositionin thefiledpatent)thatis suitablefor making the metal feedstock flowable prior to the deposition through dynamic recrystallization induced grain refinement at elevated temperatures.The flowable metal was extruded out of the printer head like a paste for building dense metal parts with fine equiaxed grains and wrought mechanical properties.Off-the-shelf metal rods were used as feedstock and the printing process was completed in an open-air environment,avoiding pricy powders and costly inert or vacuum conditions.The resulting multi-layer de-posited 6061 aluminum alloys yield strength and ductility comparable to wrought 6061 aluminum alloys after the same T6 heat treatment.The extrusion-based metal AM method can also be advanced as green manufacturing technologies for fabricating novel alloys and composites,adding novel features to existing parts,repairing damaged metal parts,and welding advanced metals for supporting sustainable manufac-turing,in addition to being developed into a cost-effective manufacturing process for the fabrication of dense metal of complex structural forms.

关 键 词：Additive friction extrusion deposition Microstructure refinement Solid state additive manufacturing Additive friction stir deposition Friction stir welding 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程] V46