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Xiao Li

Xiao Li

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352


Dr. Xiao Li received his PhD from University of South Carolina in 2016 where he’s working on friction extrusion, friction stir welding and other friction stir processing. He joined PNNL in 2017 after one year postdoc in UofSC investigating aluminum alloy friction stir welding and friction hydro pillar processing. Dr. Xiao Li now is performing R&D on solid-phase processing and metal composites manufacturing to achieve novel microstructures and improved material properties.

Research Interests

  • Solid-phase processing
  • Shear-Assisted extrusion and processing (Friction consolidation and extrusion)
  • Friction stir welding
  • Numerical simulation of friction stir processing
  • Additive manufacturing

Education and Credentials

  • Ph.D. Mechanical Engineering, University of South Carolina, 2016
  • M.S. Engineering Mechanics, HoHai University, 2011
  • B. S Engineering Mechanics, HoHai University, 2008

Affiliations and Professional Service

  • American Society of Mechanical Engineers
  • The Minerals, Metals & Materials Society

PNNL Publications


  • Li X., N.R. Overman, T.J. Roosendaal, M.J. Olszta, C. Zhou, H. Wang, and T.A. Perry, et al. 2019. "Microstructure and mechanical properties of pure copper wire produced by shear assisted processing and extrusion." JOM. The Journal of the Minerals, Metals and Materials Society 71, no. 12:4799-4805. PNNL-SA-147051. doi:10.1007/s11837-019-03752-w
  • Upadhyay P., X. Li, and T.J. Roosendaal. 2019. "High-Speed Friction stir lap welding of Al alloys." In Friction Stir Welding and Processing X. The Minerals, Metals & Materials Series, edited by Y. Hovanski, et al, 67-75. Cham:Springer. PNNL-SA-140140. doi:10.1007/978-3-030-05752-7_7

Selected Publications


  • Baffari, D., Reynolds, A. P., Li, X., & Fratini, L. (2017). Influence of processing parameters and initial temper on Friction Stir Extrusion of 2050 aluminum alloy. Journal of Manufacturing Processes, 28, 319-325.
  • Li, X., Baffari, D., & Reynolds, A. P. (2017). Friction stir consolidation of aluminum machining chips. The International Journal of Advanced Manufacturing Technology, 1-12.


  • Li, X., Tang, W., Reynolds, A. P., Tayon, W. A., & Brice, C. A. (2016). Strain and texture in friction extrusion of aluminum wire. Journal of Materials Processing Technology, 229, 191-198.


  • Li, X., Reynolds, A. P., Baoqiang, C., Jialuo, D., & Williams, S. (2015). Production and properties of a wire-arc additive manufacturing part made with friction extruded wire. In TMS 2015 144th Annual Meeting & Exhibition (pp. 445-452). Springer, Cham.
  • Zhang, H., Deng, X., Li, X., Tang, W., Reynolds, A. P., & Sutton, M. A. (2015). Thermo-Fluid Modeling of the Friction Extrusion Process. In Challenges in Mechanics of Time-Dependent Materials, Volume 2 (pp. 187-196). Springer, Cham.
  • Zhang, H., Li, X., Tang, W., Deng, X., Reynolds, A. P., & Sutton, M. A. (2015). Heat transfer modeling of the friction extrusion process. Journal of Materials Processing Technology, 221, 21-30.


  • Li, X., Tang, W., & Reynolds, A. P. (2013). Material flow and texture in friction extruded wire. In Friction Stir Welding and Processing VII (pp. 339-347). Springer International Publishing.


  • Li, X., Tang, W., & Reynolds, A. P. (2012). Visualization of material flow in friction extrusion. In ICAA13 Pittsburgh (pp. 1659-1664). Springer, Cham.

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