Scientific  Accomplishments and Expertise:

Development of the Embedded Atom Method (EAM): this semi-empirical atomistic method has become the standard mode of calculation for complex  applications in materials science.  Well over 100 groups are currently using  this method and its variations worldwide.

Development of atomistic models to predict the behavior of helium in metals: these models and their application have led to the understanding of the phenomena of low temperature helium embrittlement.  The calculations have strongly affected research and technology in the areas of fission, fusion, and nuclear weapons materials.

Development of a model to explain hydrogen isotope recombination: application of this pioneering research led to the realization that tritium inventory in fusion reactors was a potential technological problem.  This model along with the computer code DIFFUSE-83 has been a mainstay of the fusion reactor materials community.

Professional competence areas:

• Alloy phase stability; Magnetic behavior; Fracture toughness
• Empirical and semi-empirical potential development for metals and semiconductors
• Diffusion and trapping of hydrogen isotopes; Hydrogen embrittlement  
• Helium behavior in metals and metal hydrides
• Hydrogen isotope molecular recombination
• Plasma/first wall hydrogen isotope recycling in fusion reactors
• Interfaces and grain boundaries
• Atomistic calculations of dislocations in metals
• Brittle and ductile fracture
• Microsegregation in welding