Research Topics

Hemkerā€™s research group has made key observations and discoveries that have challenged the way the community thinks about and understands materials behavior in nanocrystalline materials, materials for microelectromechanical systems (MEMS), metallic micro-lattices, thermal barrier coatings for satellites and gas turbines, armor ceramics, extreme environments, and high temperature structural materials. They are now working on projects including deformation behavior and grain growth in nanocrystalline materials and thin films, the characterization and modeling of multilayered thermal protection systems, the development of metallic materials for MEMS, and the development of architected materials through textile and additive manufacturing.

Hemker is the founding director of the Johns Hopkins Center for Additive Manufacturing and Architected Materials (JAM2) and has sponsored research projects with the United States Air Force, Army and Navy, as well as the Department of Energy, the National Science Foundation and NASA. He is leading a collaborative effort to develop Metal MEMS of nanotwinned-NiMoW alloys with an unprecedented balance of properties and the potential to ensure that sensors can hold up to the demands of the next technological frontier. Hemker also is co-principal investigator of a $1.6 million Designing Materials to Revolutionize and Engineer Our Future (DMREF) grant from the National Science Foundation, in which researchers at Johns Hopkins and Georgetown University are studying the fused filament fabrication (FFF) process and its effect on the underlying molecular structure and properties of 3-D-printed polymers.

Research Areas:

  • Characterization and modeling of bond coat layers for thermal barrier coatings
  • Characterization of materials for MEMS applications
  • Deformation behavior of intermetallic alloys
  • Deformation behavior of nanocrystalline materials
  • Experimental characterization of dislocation core structure
  • High temperature mechanical behavior
  • Macroscopic mechanical response of advanced structural materials
  • Macroscopic mechanical response of metals and alloys
  • Microsample testing
  • Microstructural details
  • Transmission electron microscopy (TEM)