College Park, Maryland      June 6 - 10 , 2004

T3-C1 (3:45 PM): Neutron Diffraction Studies of Micromechanics of Material Deformation (Invited)

E. Ustundag (Department of Materials Science, California Institute of Technology, Pasadena, California 91125)

Neutron powder diffraction offers unique opportunities to study material deformation in situ under a variety of conditions. In addition to phase information, one can also collect data on texture and lattice strain as a function of stress, temperature and sample environment. The diffraction data are then complemented with micromechanics modeling for full interpretation and to obtain the in situ constitutive behavior of the material. The latter is very difficult to deduce from ex situ tests and is crucial for predicting the long term performance in service.

The recent construction of dedicated engineering diffractometers such as SMARTS at the Los Alamos Neutron Science Center has elevated the engineering neutron diffraction field to a new level of sophistication. It is now possible to perform tests at stresses exceeding 3 GPa, temperatures above 1500 C and in numerous controlled environments. These capabilities allow the in situ investigation of most practical materials. This presentation will describe recent work on bulk metallic glass composites, structural ceramics and metal matrix composites. It will also offer insight into exciting future developments.

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