Accession Number : ADA291486

Title :   Examination of Dislocation Core Structures in B2 Intermetallic Alloys.

Descriptive Note : Final technical rept.,

Corporate Author : MICHIGAN STATE UNIV EAST LANSING DEPT OF MATERIALS SCIENCE AND MECHANICS

Personal Author(s) : Crimp, Martin A.

PDF Url : ADA291486

Report Date : 27 FEB 1995

Pagination or Media Count : 53

Abstract : 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

Descriptors :   *PLASTIC DEFORMATION, *CORES, *DISLOCATIONS, *NICKEL, *INTERMETALLIC COMPOUNDS, *ALUMINIDES, *IRON ALUMINIDE, MECHANICAL PROPERTIES, MODELS, MATERIALS, COMPOSITE MATERIALS, STRUCTURES, CRYSTALS, ALLOYS, HIGH RESOLUTION, ELECTRON MICROSCOPY, IMAGES, STOICHIOMETRY, COBALT, ATOMIC STRUCTURE, COAL, ATOMIC ENERGY LEVELS.

Subject Categories : Properties of Metals and Alloys
      Organic Chemistry
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE