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Brian Welk

  • Research Associate 2-Engineer, Materials Science Engineering
  • 1305 Kinnear Rd
    Columbus, OH 43212

About

Brian is a member of CAMM. He has been involved in multiple research projects while at CAMM.  The primary research has been on microstructure and property relationships in titanium alloys.  He has also worked on projects involving steels, bulk metallic glasses and high entropy alloys.  While pursuing his research interests, Brian has gained expertise in many of the tools available at CAMM such as the LENS™ (compositional gradient depositions), Gleeble and ETMT electrothermal mechanical testers and the vacuum arc melter.  Brian also has experience operating a scanning electron microscope (SEM), focused ion beam microscope (FIB), transmission electron microscope (TEM) and several models of x-ray diffractometers for enhanced material characterization.

Brian’s current research involves the study of high entropy alloys (HEAs).  HEAs are relatively new materials with excellent properties such as high strength, good wear resistance and good corrosion resistance. The alloys typically contain 5 or more elements ranging in concentration from 5-35 at.%.  This is different from most alloys which have a single principal element such as titanium or nickel.  HEAs typically form simple FCC and/or BCC solid solutions.  The initial HEA study was performed on the composition of CrCoCuNiFeAlx, where x is the molar ratio.  Typically, these alloys are arc melted and cast, however, in the recent investigation the LENS™ was used to deposit a compositionally graded sample, which varied the Al molar ratio from 0 to 3.  SEM, TEM and XRD techniques were used to better understand the phase transformations occurring along the gradient.  A dendritic and interdendritic microstructure was present along the gradient with copper segregating to the interdendritic regions.  With an Al molar ratio of approximately 1.5, spinodal decomposition has been observed with copper nano-precipitates dispersed throughout.  Future research includes investigating the spinodal decomposition as well as creating a compositionally graded LENS™ deposition varying the copper molar ratio from 0 to 1.  Additional research interests include the mechanical properties of the HEAs and their deformation mechanisms as well as investigating bulk metallic glasses and high entropy alloys composites.

Journal Articles

2011