PNNL

James (Jacob) Haag is a materials scientist and electron microscopist in the Reactor Materials group at Pacific Northwest National Laboratory (PNNL). His work is centered on the development of materials and characterization capabilities to observe, understand, and withstand extreme thermal and irradiation environments. 

Haag’s research interests include the development of materials for nuclear fusion energy, post-irradiation examination of materials, in situ electron microscopy, and 3D reconstruction.

Prior to joining PNNL, Haag received his PhD in materials science & engineering at Virginia Tech.

• Nuclear Fusion
• Post-irradiation Examination
• Transmission Electron Microscopy
• In-situ Electron Microscopy
• Crystallography
• Diffraction
• Electron Backscatter Diffraction
• Materials Science and Engineering

• PhD, materials science & engineering, Virginia Polytechnic Institute and State University
• BASc, material sciences, Virginia Polytechnic Institute and State University

2025

• Šedajová; V., M. Kim, R. Langer, G. Kumar, L. Liu, Z. Badura, and J.V. Haag, et al. 2025. "2D Nitrogen-Doped Graphene Materials for Noble Gas Separation." Small 21, no. 6:rt. No. 2408525. PNNL-SA-194350. doi:10.1002/smll.202570045
• Edwards D.J., A.L. Schemer-Kohrn, M.J. Olszta, R. Prabhakaran, Y. Zhu, J. Wang, and J.V. Haag, et al. 2025. "Understanding and Removing FIB Artifacts in Metallic TEM Samples Using Flash Electropolishing." Journal of Nuclear Materials 606:Art. No. 155618. PNNL-SA-202068. doi:10.1016/j.jnucmat.2025.155618
• Haag J.V., Y. Fu, W. Jiang, B.E. Matthews, M.J. Olszta, D.J. Edwards, and W. Setyawan. 2025. "Quantitative assessment of Ni+ and He+ ion irradiation damage in a tungsten heavy alloy under the simulated nuclear fusion environment." Scientific Reports 15:Art. No. 7066. PNNL-SA-206824. doi:10.1038/s41598-025-89532-w

2024

• Alam M., J.V. Haag, W. Setyawan, C.H. Henager, and G. Odette. 2024. "On the Effect of High-Temperature Annealing on the Microstructure and Mechanical Properties of a Hot-Rolled 90W7Ni3Fe Tungsten Heavy Alloy." Materials Science and Engineering A. Structural Materials: Properties, Microstructure and Processing 896, no. _:Art. No. 146200. PNNL-SA-192390. doi:10.1016/j.msea.2024.146200
• Haag J.V., M.J. Olszta, D.J. Edwards, W. Jiang, and W. Setyawan. 2024. "Characterization of boundary precipitation in a heavy ion irradiated tungsten heavy alloy under the simulated fusion environment." Acta Materialia 274. PNNL-SA-182623. doi:10.1016/j.actamat.2023.119059
• Olszta M.J., K.H. Yano, D.F. Hopkins, K.R. Fiedler, J.V. Haag, and I.J. van Rooyen. 2024. TiltEM User Manual. PNNL-36495. Richland, WA: Pacific Northwest National Laboratory. TiltEM User Manual

2023

J.V. Haag IV, M.J. Olszta, D.J. Edwards, W. Jiang, W. Setyawan, “Characterization of boundary precipitation in a heavy ion irradiated tungsten heavy alloy under the simulated fusion environment,” Acta Materialia, 2023, https://doi.org/10.1016/j.actamat.2023.119059

J.V. Haag IV, J. Wang, K. Kruska, M. J. Olszta, C. H. Henager Jr., D. J. Edwards, W. Setyawan, M. Murayama, “Investigation of interfacial strength in nacre-mimicking tungsten heavy alloys for nuclear fusion applications,” Scientific Reports, vol. 13, no. 1, p. 575, Jan. 2023, doi: 10.1038/s41598-022-26574-4.

2022

J.V. Haag IV, “Multiscale microstructural investigation of the ductile phase toughening effect in a bi-phase tungsten heavy alloy,” Doctoral dissertation, Virginia Tech, 2022.

J.V. Haag IV, J. Wang, D.J. Edwards, W. Setyawan, and M. Murayama, “A boundary-based approach to the multiscale microstructural characterization of a W-Ni-Fe tungsten heavy alloy,” Scripta Materialia, vol. 213, p. 114587, May 2022, doi: 10.1016/j.scriptamat.2022.114587.

2021

J.V. Haag IV, D. J. Edwards, C. H. Henager, W. Setyawan, J. Wang, and M. Murayama, “Characterization of ductile phase toughening mechanisms in a hot-rolled tungsten heavy alloy,” Acta Materialia, vol. 204, p. 116523, Feb. 2021, doi: 10.1016/j.actamat.2020.116523.