Senior Nuclear Materials Advisor
Reactor Materials and Mechanical Design Group
Senior Nuclear Materials Advisor
Reactor Materials and Mechanical Design Group


Stuart Maloy is a senior nuclear materials advisor at the Reactor Materials and Mechanical Design Group in Pacific Northwest National Laboratory. He has previous experience at Los Alamos National Laboratory where he worked for 33 years specializing in radiation-based effects on materials. He is also a national laboratory professor with the Nuclear Engineering department at the University of New Mexico and is a fellow of the American Nuclear Society. He has undergraduate (1989), masters (1991), and PhD (1994) degrees in Materials Science from the Case Western Reserve University and is a registered professional engineer in metallurgy.

He has applied his expertise to characterize and test the properties of metallic and ceramic materials in extreme environments such as under neutron and proton irradiation at reactor relevant temperatures. This includes testing the mechanical properties (fracture toughness and tensile properties) of martensitic steel Mod. 9Cr-1Mo, HT-9 alloy , stainless steel (316L, 304L), INCONEL® alloy 718, aluminum alloys Al 6061-T6, and Al 5052 after exposure to high energy proton and neutron irradiations using accelerators and fast reactors. Characterization of materials after testing includes the use of transmission electron microscopy for analyzing defects such as dislocations, twins and second phases, and high resolution electron microscopy to characterize defects at an atomic level as well as nanoscale mechanical testing. Stuart has more than 250 peer-reviewed technical publications (with more than 7500 citations and an h-index of 45) and numerous presentations.

Research Interest

  • Materials science and engineering
  • Mechanical testing
  • Radiation effects on materials
  • Transmission electron microscopy.


  • PhD in Material Science & Engineering, Case Western Reserve University (1994)
  • MS in Materials Science, Case Western Reserve University (1991)
  • BS in Engineering, Case Western Reserve University (1989).

Affiliations and Professional Service

  • Fellow, American Nuclear Society.

Awards and Recognitions

  • Distinguished Postdoc Mentor Award, Los Alamos National Laboratory (2021)
  • Materials Science & Technology Literary Award, American Nuclear Society (2015)
  • Materials Science & Technology Outstanding Achievement Award, American Nuclear Society (2014)
  • Robert Lansing Hardy Award, The Minerals, Metals & Materials Society (February 1998)
  • Los Alamos Awards Program Award for designing and fabricating the materials irradiation experiments that were fielded in the 1997 Los Alamos Neutron Science Center accelerator runs, in support of the Accelerator Production of Tritium project (October 1997).




El-Atwani O., S. Maloy, and I. Baker. 2021. “Characterization of advanced nuclear materials under extreme environments.” Materials Characterization. 183. 111597. doi: 10.1016/j.matchar.2021.111597

Kim H., J.G. Gigax, C.J. Rietema, O. El Atwani, M.R. Chancey, J.K. Baldwin, Y. Wang, S.A. Maloy. 2022. “Void swelling of conventional and composition engineered HT9 alloys after high-dose self-ion irradiation.” Journal of Nuclear Materials, Volume 560, 153492, ISSN 0022-3115. doi:10.1016/j.jnucmat.2021.153492

Lienert T.J., C.R. Lear, T.E. Steckley, L.R. Lindamood, J.E. Gould, S.A. Maloy, B.P. Eftink. 2022. “Projection-capacitor discharge resistance welding of 430 stainless steel and 14YWT.” Journal of Manufacturing Processes, Volume 75, Pages 1189-1201, ISSN 1526-6125. doi: 10.1016/j.jmapro.2022.01.036

Lear, C.R., J.G. Gigax, M.M. Schneider, T.E. Steckley, T.J. Lienert, S.A. Maloy, and B.P. Eftink. 2022. "Solid-State Welding of the Nanostructured Ferritic Alloy 14YWT Using a Capacitive Discharge Resistance Welding Technique" Metals 12, no. 1: 23. doi: 10.3390/met12010023

Massey C.P, P.D. Edmondson, M. N. Gussev, K. Mao, T. Gräning, T.J. Nizolek, S.A. Maloy, D. Sornin, Y. de Carlan, S.N. Dryepondt, D.T. Hoelzer. 2022. “Insights from microstructure and mechanical property comparisons of three pilgered ferritic ODS tubes.” Materials & Design, Volume 213, 110333, ISSN 0264-1275. doi:10.1016/j.matdes.2021.110333

Rietema C.J., M.R. Chancey, S.K. Ullrich, C.B. Finfrock, D.V. Marshall, B.P. Eftink, Y.Q. Wang, G.R. Bourne, S.A. Maloy, A.J. Clarke, K.D. Clarke. 2022. “The influence of nitrogen and nitrides on the structure and properties of proton irradiated ferritic/martensitic steel.” Journal of Nuclear Materials, Volume 561, 2022, 153528, ISSN 0022-3115. doi:10.1016/j.jnucmat.2022.153528

Sau, M., E.D. Hintsala, Y. Chen, et al. 2022. “High-Throughput Nanoindentation Mapping of Additively Manufactured T91 Steel.” JOM 74, 1469–1476. doi:10.1007/s11837-022-05189-0


Balbaud F., C. Cabet, S. Cornet, Y. Dai, J. Gan, M. Hernández Mayoral, R. Hernández, A. Jianu, L. Malerba, S.A. Maloy, J. Marrow, S. Ohtsuka, N. Okubo, M.A. Pouchon, A. Puype, E. Stergar, M. Serrano, D. Terentyev, Y.G. Wang, A. Weisenburger. 2021. “A NEA review on innovative structural materials solutions, including advanced manufacturing processes for nuclear applications based on technology readiness assessment.” Nuclear Materials and Energy, Volume 27, 101006, ISSN 2352-1791, doi: 10.1016/j.nme.2021.101006

Eftink B.P, D.A. Vega, O. El Atwani, D.J. Sprouster, Y.S.J. Yoo, T.E. Steckley, E. Aydogan, C.M. Cady, M. Al-Sheikhly, T.J. Lienert, S.A. Maloy. 2021. “Tensile properties and microstructure of additively manufactured Grade 91 steel for nuclear applications.” Journal of Nuclear Materials, Volume 544, 152723, ISSN 0022-3115. doi: 10.1016/j.jnucmat.2020.152723

El-Atwani O., B.P. Eftink, C.M. Cady, D.R. Coughlin, M.M. Schneider, S.A. Maloy. 2021. “Enhanced mechanical properties of additive manufactured Grade 91 steel.” Scripta Materialia, Volume 199, 113888, ISSN 1359-6462. doi: 10.1016/j.scriptamat.2021.113888

El-Atwani O., H. Kim, J.G. Gigax, C. Harvey, B. Aytuna, M. Efe, S.A. Maloy. 2021. “Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining.” Nanomaterials 11(10). doi: 10.3390/nano11102538

El-Atwani O., H. Kim, C. Harvey, M. Efe, S.A. Maloy. 2021. “Limitations of Thermal Stability Analysis via In-Situ TEM/Heating Experiments.” Nanomaterials 11(10). doi: 10.3390/nano11102541

Harvey C., O. El Atwani, H. Kim, C. Lavender, M. McCoy, D. Sornin, J. Lewandowski, S.A. Maloy, S. Pathak. 2021. “Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing.” Materials Characterization, Volume 171, 110744, ISSN 1044-5803, doi: 10.1016/j.matchar.2020.110744

Harvey C., A.J. Torrez, S. Lam, H. Kim, S.A. Maloy, J.G. Gigax. 2021. “Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel.” JOM 73(12) (2021) 4240-4247. doi: 10.1007/s11837-021-04964-9

Kim H., J.G. Gigax, O. El-Atwani, M.R. Chancey, J.K. Baldwin, Y. Wang, S.A. Maloy. 2021. “Comparison of void swelling of ferritic-martensitic and ferritic HT9 alloys after high-dose self-ion irradiation.” Materials Characterization 173. doi: 10.1016/j.matchar.2021.110908

Mukherjee T., T. DebRoy, T.J. Lienert, S.A. Maloy, P. Hosemann. 2021. “Spatial and temporal variation of hardness of a printed steel part.” Acta Materialia, Volume 209, 116775, ISSN 1359-6454, doi: 10.1016/j.actamat.2021.116775

Radhakrishnan, M., E. Torresani, E. Olevsky, E. et al. 2021. “Joining of Nanostructured Ferritic 14YWT Alloys by Spark Plasma Technique.” Journal of Materials Engineering and Performance 30, 5736–5741. doi: 10.1007/s11665-021-05776-3

Rietema C.J., M.M. Hassan, O. Anderoglu, B.P. Eftink, T.A. Saleh, S.A. Maloy, A.J. Clarke, K.D. Clarke. 2021. “Ultrafine intralath precipitation of V(C,N) in 12Cr-1MoWV (wt.%) ferritic/martensitic steel.” Scripta Materialia, Volume 197, 113787, ISSN 1359-6462, doi: 10.1016/j.scriptamat.2021.113787

Rietema C.J., T.A. Saleh, D.T. Hoelzer, et al. 2021. “Enhancement of Nanostructured Ferritic Alloy 14YWT Properties via Heat Treatment for Post-Consolidation Processing.” Metall Mater Trans A 52, 2821–2829. doi: 10.1007/s11661-021-06275-9

Sun C., M.N. Bachhav, Y. Wang, M. Li, S.A. Maloy. 2021. “Helium-bubble-enhanced disordering of intermetallic phase under irradiation.” Materials Characterization, Volume 176, 111094, ISSN 1044-5803. doi: 10.1016/j.matchar.2021.111094

Tunes M.A., G. Greaves, P. Rack, W. Boldman, C. Schon, S. Pogatscher, S.A. Maloy, Y.W. Zhang, O. El-Atwani. 2021. “Irradiation stability and induced ferromagnetism in a nanocrystalline CoCrCuFeNi highly-concentrated alloy.” Nanoscale 13(48) (2021) 20437-20450. doi: 10.1039/D1NR04915A

Vo H.T., O. Anderoglu, P. Hosemann, S.A. Maloy. 2021. “The effects of microstructures and radiation damage on the deformation behavior of a HT-9 alloy using microtensile testing.” Materials Characterization, Volume 174, 110972, ISSN 1044-5803, doi: 10.1016/j.matchar.2021.110972

Vo H.T., K. Dang, F. Teng, M. Schneider, B.P. Eftink, S.A. Maloy, J.D. Tucker, L. Capolungo, P. Hosemann. 2021. “Deformation twinning versus slip in Ni-based alloys, containing Pt2Mo-structured, Ni2Cr-typed precipitates.” Materials & Design, Volume 207, 109820, ISSN 0264-1275. doi: 10.1016/j.matdes.2021.109820

Vo H.T., E.K. Still, K. Lam, A. Drnovšek, L. Capolungo, S.A. Maloy, P. Chou, P. Hosemann. 2021. “Experimental methodology and theoretical framework in describing constrained plastic flow of FCC microscale tensile specimens.” Materials Science and Engineering: A, Volume 799, 140124, ISSN 0921-5093. doi: 10.1016/j.msea.2020.140124