Jörg Wiezorek

 

Associate Professor, Department of Mechanical Engineering and Materials Science

843 Benedum Hall

412-624-0122, 8069(fax)

wiezorek@pitt.edu

http://www.engr.pitt.edu/materials/people/facstaff/wiezorek_jorg.html

 

 

Jörg Wiezorek’s group studies the structure and composition of materials at the nano-scale using analytical and high-resolution transmission electron microscopy (TEM) and scanning probe microscopy techniques (e.g. AFM & MFM) in combination with electronic, magnetic and mechanical property measurements. Based on the structural visualization of nanomaterials, including dynamic observations of structural changes and property measurement the frequently unexpected behavior and functionality of nano-materials is explained and novel phenomena are discovered. Recent research involved studies of effects of reducing crystallite size to the nano-scale on chemical ordering and properties in magnetic intermetallics, of interest for ultra-high capacity computer hard-drives for instance, and of the deformation mechanisms in nanocrystalline metals responsible for their enormously enhanced mechanical strength compared with conventional metals and alloys.

 

 

 

 

 

 

 

 

Images of nanostructures: A) magnetic domains at layer interface in ferromagnetic FePd (MFM); B) chemically ordered FePd nano-domains and inset diffraction pattern (TEM); C) mobile dislocations in crystal lattice at advancing crack during in-situ deformation of nano-crystalline Ni (in-situ straining high resolution TEM).