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Meeting MS&T21: Materials Science & Technology
Symposium Additive Manufacturing: Alloy Design to Develop New Feedstock Materials III
Presentation Title Solidification Cracking in Binary Al-Cu Alloys (1.5, 3.0, 4.5, 6.0, and 10 wt.% Cu) Additively Manufactured by Laser Powder Bed Fusion
Author(s) Keegan Muller, Thinh Huynh, Holden Hyer, Sharon M Park, Le Zhou, Jeongmin Woo, Abhishek Mehta, Brandon A McWilliams, Kyu Cho, Yongho Sohn
On-Site Speaker (Planned) Keegan Muller
Abstract Scope Understanding of solidification cracking and its composition dependence are crucial in designing alloys that are suitable for laser powder bed fusion (LPBF). In this study, the crack density of Al-Cu binary alloys (1.5, 3.0, 4.5, 6.0, and 10 wt.% Cu), produced by LPBF from gas atomized powders, were determined by metallography, and examined with respect to Kou’s cracking susceptibility index, |dT/d(fs)1/2|, derived from the Scheil-Gulliver equation. Maximum crack density was experimentally observed for alloys with higher solute content than that predicted by cracking susceptibility model (i.e., no diffusion in solid and equilibrium partition coefficient). Presence of solid-state diffusion and/or variation in partition coefficient on cracking susceptibility index, based on Kurz and Fisher’s modified Scheil-Gulliver equation, were examined to deduce their respective influence on the composition-dependence and magnitude of LPBF solidification cracking index. Partition coefficients appropriate for LPBF solidification were estimated based on diffusion coefficients available in literature for Al-Cu alloys.


A High-throughput Method to Define New Feedstock Process Parameters in Additive Manufacturing
Additive Manufacturing Feasibility Investigation Using Single Track Study for the Fabrication of Borated Austenitic Stainless Steels via Laser Powder Bed Fusion
Development of Al-Ce Alloys for Additive Manufacturing Using the CALPHAD Method
Grain Boundary Engineering of 316L Stainless Steel via Laser Powder Bed Fusion
Insights into Additive Manufacturability and Microstructure Evolution from Simple Analytical Models
Solidification Cracking in Binary Al-Cu Alloys (1.5, 3.0, 4.5, 6.0, and 10 wt.% Cu) Additively Manufactured by Laser Powder Bed Fusion
Spherical Micro/Macro Indentation Stress-strain Curves for Additive Manufacturing Materials Design

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