|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Direct Ink Writing Printing and Microstructural Engineering of Lightweight Al10Co25Cr8Fe15Ni36Ti6 Micro-lattices
||Ming Chen, Dingchang Zhang, Ya-Chu Hsu, David Dunand
|On-Site Speaker (Planned)
Given its superior high-temperature strength and oxidation resistance, Al10Co25Cr8Fe15Ni36Ti6 is a promising alloy for high-temperature structural applications. Additive manufacturing provides high flexibility for fabrication of complex shapes, but, for Al10Co25Cr8Fe15Ni36Ti6, traditional AM approaches based on laser beam fusion/solidification induce cracking and warping due to high temperatures and thermal gradients. Here, we demonstrate 3D direct ink writing technique can fabricate lightweight Al10Co25Cr8Fe15Ni36Ti6 micro-lattices, enabling complex geometries with superior strength and ductility for applications in high-temperature structural components. Elemental powders are suspended, together with binder, into an ink which is 3D-extruded into thin struts, in air at ambient temperature. Printed green bodies are sintered at elevated temperatures to decompose binder and densify powders. We discuss various approaches to achieve high quality micro-lattices and mitigate oxidation and impurities issues during sintering; we also describe effects of compositions on morphologies and volume fraction of γ’ precipitates to achieve high strength at elevated temperatures.
||Planned: Metallurgical and Materials Transactions