Examination of Dislocation Core Structures in B2 Intermetallic Alloys.
Final technical rept.,
MICHIGAN STATE UNIV EAST LANSING DEPT OF MATERIALS SCIENCE AND MECHANICS
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In an effort to understand the detailed mechanisms involved in the plastic deformation of crystalline materials, the atomic level structure of dislocations has been studied in B2 ordered intermetallic alloys. High resolution electron microscopy HREM has been used to directly image dislocation cores in NiAl, CoAl and FeAl alloys. Alloys have been studied with stoichiometric and non-stoichiometric compositions. The observed structures have been related to the mechanical behavior observed in these alloys. The experimentally observed dislocation core structures have been compared to theoretical structures modeled under ONR support by Prof. D. Faikas. This has led to a critical analysis of the model structures and improvement in the modeling approaches, in particular for non-stoichiometric alloys. jg
- Properties of Metals and Alloys
- Organic Chemistry
- Atomic and Molecular Physics and Spectroscopy