Materials Scientist
Materials Scientist


Xiaolong Ma is a materials scientist in the Energy and Environment Directorate. His research focuses on mechanism-driven materials design and processing using multiple characterization techniques. After spending nearly a decade exploring a variety of metals and alloys, he accumulated extensive experience in practicing the processing-microstructure-property relationship in developing novel metallic materials. His current research interest includes solid phase processing of lightweight alloys and metal-matrix composites and expediting electron microscopy analysis using machine learning techniques.

Xiaolong holds a PhD in materials science, an MA in statistics from North Carolina State University, and a BS in materials science from Zhejiang University. Prior to joining PNNL, he received his postdoc training at Johns Hopkins University and Texas A&M University.

Research Interest

  • Materials design and processing
  • Deformation physics
  • Magnesium
  • Electron microscopy
  • Machine learning for microscopy


  • MS in Statistics, North Carolina State University
  • PhD in Materials Science and Engineering, North Carolina State University
  • BS in Materials Science and Engineering, Zhejiang University, China

Affiliations and Professional Service

  • The Mineral, Metals & Materials Society



Das H., P. Upadhyay, T. Wang, B. Gwalani, and X. Ma. 2021. "Interfacial reaction during friction stir assisted scribe welding of immiscible Fe and Mg alloy system." Scientific Reports 11, no. 1:1588. PNNL-SA-155716. doi:10.1038/s41598-021-81266-9

Komarasamy M., X. Li, S.A. Whalen, X. Ma, N.L. Canfield, M.J. Olszta, and T. Varga, et al. 2021. "Microstructural evolution in Cu-Nb processed via friction consolidation." Journal of Materials Science 56, no. 22:12864-12880. PNNL-SA-158852. doi:10.1007/s10853-021-06093-9

Li X., C. Zhou, N.R. Overman, X. Ma, N.L. Canfield, K.S. Kappagantula, and J.G. Schroth, et al. 2021. "Copper carbon composite wire with a uniform carbon dispersion made by friction extrusion." Journal of Manufacturing Processes 65. PNNL-SA-159070. doi:10.1016/j.jmapro.2021.03.055

Wang T., S.A. Whalen, X. Ma, J.A. Silverstein, H. Das, M. Pallaka, and A. Ortiz, et al. 2021. "Friction-based riveting technique for magnesium alloy." Journal of Magnesium and Alloys. PNNL-SA-155089. doi:10.1016/j.jma.2021.06.004

Whalen S.A., M. Reza E Rabby, T. Wang, X. Ma, T.J. Roosendaal, and B.S. Taysom. 2021. "Shear Assisted Processing and Extrusion of Aluminum Alloy 7075 Tubing at High Speed." In Light Metals held at the TMS Annual Meeting and Exhibition, March 15-18, 2021. Minerals, Metals and Materials Series, edited by L. Perander, 6, 277-280. Cham: Springer. PNNL-SA-156009.  doi:10.1007/978-3-030-65396-5_41

Xie K.Y., D. Zhao, B. Leu, X. Ma, Q. Jiao, J.A. El-Awady, and T.P. Weihs, et al. 2021. "Understanding the interaction of extension twinning and basal-plate precipitates in Mg-9Al using precession electron diffraction." Materialia 15. PNNL-SA-160240. doi:10.1016/j.mtla.2021.101044

Zhao D., X. Ma, A. Srivastava, G. Turner, I. Karaman, and K.Y. Xie. 2021. "Significant disparity of non-basal dislocation activities in hot-rolled highly-textured Mg and Mg-3Al-1Zn alloy under tension." Acta Materialia 207. PNNL-SA-159301. doi:10.1016/j.actamat.2021.116691