PNNL

• Additive Manufacturing
• Metal Matrix Composites
• HEAs
• Titanium alloys
• Aluminum alloys
• Soft magnetic materials
• Characterization
• Mechanical properties

• Additive Manufacturing
• Failure Analysis
• Materials Characterization
• Materials Development
• Materials Engineering
• Metal Matrix Composites
• Microstructure
• Powder Handling
• Powder Processing
• Powder X-ray Diffraction
• SEM
• Structure-property Relationships
• Titanium
• X-ray Diffraction Analysis

• PhD, materials science and engineering, University of North Texas
• MS, materials science and engineering, Indian Institute of Science
• BS, materials science, Indian Institute of Science

Selected publications

2026

• M.S.K.K.Y. Nartu, S. Tripathi, et al., 2026. "A robust alloy design (RAD) strategy for next-generation (IV) nuclear fission reactors." Materials & Design, vol. 265. DOI 10.1016/j.matdes.2026.116012

2025

• Pathak P., and M. Nartu. 2025. "Additive manufacturing of soft magnetic high entropy alloys: A Review." Journal of Magnetism and Magnetic Materials 627:Art. No. 173148. PNNL-SA-208676. doi:10.1016/j.jmmm.2025.173148

2024

• Burns C.A., S.J. Livers, S. Meher, A. Mahmud, D. Garcia, P. Meher, and T. Hartmann, et al. 2024. Development Results on Replacement Materials for Current Scarce or High Supply Chain Risk Materials. PNNL-36491. Richland, WA: Pacific Northwest National Laboratory. Development Results on Replacement Materials for Current Scarce or High Supply Chain Risk Materials
• Meher S., A. Mahmud, C.M. Silva, A.M. Rieffer, I.J. van Rooyen, A. Roy, and P.A. Renner, et al. 2024. Studies on Printability Methodologies and Directed-Energy-Deposition-Fabricated Iron Alloys for Nuclear Applications. PNNL-36408. Richland, WA: Pacific Northwest National Laboratory. Studies on Printability Methodologies and Directed-Energy-Deposition-Fabricated Iron Alloys for Nuclear Applications
• Nartu M., S. Meher, I.J. van Rooyen, D. Garcia, T. Wang, J. Fernandez dos Santos, and S. Tripathi, et al. 2024. Advanced Manufacturing Techniques and Compositions of High Entropy Alloys for Nuclear Applications. PNNL-36488. Richland, WA: Pacific Northwest National Laboratory. Advanced Manufacturing Techniques and Compositions of High Entropy Alloys for Nuclear Applications
• van Rooyen I., S. Meher, P.K. Thallapally, J. Fernandez dos Santos, C.M. Silva, S. Shin, and T. Wang, et al. 2024. Nuclear Energy Critical Material Waste Minimization Enabled by AM Techniques. PNNL-36049. Richland, WA: Pacific Northwest National Laboratory. doi:10.2172/2481591.Nuclear Energy Critical Material Waste Minimization Enabled by AM Techniques
• van Rooyen I.J., J.F. Fitzpatrick, N.P. Barrett, C. Mason, S. Meher, D. Yoon, and R.O. Montgomery, et al. 2024. Benchmark Study Matrix for Microreactor Geometries Relevant to Multiple Developers. PNNL-36686. Richland, WA: Pacific Northwest National Laboratory. Benchmark Study Matrix for Microreactor Geometries Relevant to Multiple Developers

2023

• Meher S., C.M. Silva, M. Nartu, A. Roy, W.E. Frazier, M. Komarasamy, and T. Ajantiwalay, et al. 2023. Evaluation of printability methodologies and feasibility to down select LBPF steel and other materials for nuclear applications. PNNL-34601. Richland, WA: Pacific Northwest National Laboratory. Evaluation of printability methodologies and feasibility to down select LBPF steel and other materials for nuclear applications
• Nartu M., S. Banerjee, A. Chesetti, J. Rodriguez, S. Yadav, T. Scharf, and R. Banerjee. 2023. "Solid-state reaction mediated microstructural evolution in a spark plasma sintered in situ Ti-B4C composite." Materials Science and Engineering A. Structural Materials: Properties, Microstructure and Processing 885. PNNL-SA-189437. doi:10.1016/j.msea.2023.145601
• Nartu M., S. Meher, I. van Rooyen, S. Tripathi, and N.L. Canfield. 2023. Feasibility Study of Advanced Manufacturing Techniques and Compositions of High Entropy Alloys. PNNL-34763. Richland, WA: Pacific Northwest National Laboratory. Feasibility Study of Advanced Manufacturing Techniques and Compositions of High Entropy Alloys
• van Rooyen I., A. Soulami, L. Li, M. Nartu, S. Meher, J.B. Wierschke, and J. Fernandez dos Santos, et al. 2023. Preliminary HEA Solid Phase Processing Development Report. PNNL-34986. Richland, WA: Pacific Northwest National Laboratory. Preliminary HEA Solid Phase Processing Development Report
• van Rooyen I., C.W. Enderlin, E.J. Ponce, A. Soulami, T. Hartmann, S. Meher, and V.V. Joshi, et al. 2023. Qualification Framework Evaluations, Status Quo, and Recommendations. PNNL-35024. Richland, WA: Pacific Northwest National Laboratory. Qualification Framework Evaluations, Status Quo, and Recommendations
• van Rooyen I., S. Meher, J. Fernandez dos Santos, M. Komarasamy, M. Nartu, J.B. Wierschke, and R. Prabhakaran, et al. 2023. Feasibility Evaluation of a Solid Phase Scalable HEA Cladding Manufacturing Route. PNNL-35499. Richland, WA: Pacific Northwest National Laboratory. Feasibility Evaluation of a Solid Phase Scalable HEA Cladding Manufacturing Route
• Varahabhatla S., M. Nartu, S. Mantri, V. Chaudhary, M.V. Karri, S. Joshi, and R. Ramanujan, et al. 2023. "Influence of Energy Density on the Microstructure, Growth Orientation, and Anisotropy of Magnetic Properties in Additively Manufactured Fe-3.8wt%Si Transformer Steels." Materialia 30. PNNL-SA-187968. doi:10.1016/j.mtla.2023.101854