Jun, 2026
ORNL Report
Publications
Showing 44 results for Author: Stephen A. Taller
Apr, 2026
ORNL Report
Report on Preliminary Detailed Experimental Plan for Neutron Irradiation of A709 at ATR and HFIR
Advanced nuclear power technologies will use higher temperatures as a means to extract energy at a higher efficiency than current plants and therefore put a larger demand on the structural materials. Improved performance of structural materials could enable greater safety margins, longer plant lifetimes, and reduce maintenance costs. Alloy 709 is championed as the next gen…
Apr, 2026
Journal
Mechanical properties, strain hardening, and fracture behavior of ultrasonic additively manufactured Zircaloy-4 after low-temperature neutron irradiation
Ultrasonic additive manufacturing (UAM) is a solid-state, layer-by-layer advanced manufacturing process that has the potential to create custom spatially controlled composites with embedded wires and sensors for nuclear component manufacture. To assess the feasibility of using UAM for nuclear-relevant materials research, the technique was used to produce a 3.5-mm-thick Zir…
Apr, 2026
Journal
On the uncertainties in helium generation predictions for fission and fusion alloys
With ongoing advances in fusion and advanced fission reactors, quantifying irradiation effects in materials is critical. Transmutation-induced helium in cladding and structural materials can drive swelling and embrittlement, thereby reducing these components’ lifespans. Yet most studies ignore the considerable uncertainties in predicting helium generation rates. In this wo…
Apr, 2026
Journal
Characterization of in-situ and ex-situ ion-irradiated additively manufactured 316L and 316H stainless steels
Additively manufactured (AM) 316 stainless steel (SS) differs from its wrought counterpart in its unique dislocation cell structure and the presence of segregation and oxide particles at the cell walls. This work investigated the evolution of the microstructure in laser powder bed fusion (LPBF) 316L and 316H SS under in-situ 1 MeV Kr ion irradiation at 600 °C to 5 dpa, and…
Mar, 2026
Conference Paper
Microstructure and Mechanical Properties of Ni-based Alloys Fabricated by Laser Powder Bed Fusion
The Advanced Materials and Manufacturing Technologies (AMMT) program is aiming at the accelerated incorporation of new materials and manufacturing technologies into nuclear-related systems. Complex Ni-based components fabricated by laser powder bed fusion (LPBF) could enable operating temperatures at T > 700°C in aggressive environments such as molten salts or liquid metal…
Mar, 2026
Conference Paper
Microstructural Evolution of Irradiated LPBF 316 Stainless Steel using Neutrons and Ions
Jan, 2026
ORNL Report
ORNL–TerraPower Semiannual Progress Report: Program Status Through October 2025