About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Grain Refinement and 3D Printability of High Strength Aluminum Alloys via In Situ Alloying of 2024 for LPBF Applications by Mechanical Mixing of Commercially Available Powders |
Author(s) |
John Mackenzie O`Connell, Timothy Nice, Nathaniel Badgett, Bhaskar Majumdar |
On-Site Speaker (Planned) |
John Mackenzie O`Connell |
Abstract Scope |
The rapid solidification seen in laser powder bed fusion (LPBF) additive manufacturing causes issues with segregation and cracking especially in aluminum alloys. This makes research and development of alloys that print well of paramount importance.The traditional method of alloy development for LPBF applications can be cost prohibitive due to the need to produce powders to test printability.This work proposes to show that mechanical mixing of commercially available 2024 aluminum powders, that are difficult to print due to solidification cracking, with Al10SiMg, Scalmalloy, or fine elemental powders such as Ti or rare earth metals in the proper ratio improves printability and strength. Printability is assessed via SEM, EDS, and EBSD,looking for print defects, segregation of alloying elements and grain orientation.Tensile strength is measured using printed tensile bars. The ratios of aluminum powders are identified using the CALPHAD method and Scheil diagrams the Kou crack susceptibility model. |