Tuesday  |  Salon 10  |  09:00 AM–09:40 AM

#15804, Keynote: Unique Aspects of Elevated Temperature Mechanical Behavior of Additively Manufactured Aluminum Alloys

Additive manufacturing (AM) methodologies have captured the attention of mechanical engineers and metallurgists alike. While mechanical engineers apply the mechanical design freedom associated with additive processing, metallurgists are applying fresh alloy design ideas to microstructures that result from additive manufacturing. In this presentation, the author will highlight unique aspects of elevated temperature deformation, creep and fatigue behavior of laser powder bed fused aluminum alloys that directly result from microstructural features in such alloys. At least three microstructural features will be highlighted: (i) melt-pool boundaries and how they serve as metallurgical notching during creep deformation, (ii) solute supersaturation, and formation of nanometric phases after ageing that provide unusual strain rate sensitive deformation, and (iii) dispersoids and the strengthening mechanisms associated with them. Of these features, dispersoids are critical in uniformly improving the overall elevated temperature mechanical behavior of additively manufactured aluminum alloys. Load sharing mechanisms that were critical to improvement of elevated temperature mechanical behavior of dispersoid AM aluminum alloys were investigated with in-situ neutron diffraction and will be discussed. Lessons learned that can be applied to design of other mechanically advanced alloys will be shared.

Amit Shyam   Oak Ridge National Laboratory