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Effect Of Basic Physical Parameters On Engineering Properties Of Intermetallics

Report Number: WADD TR 60-184 Part III
Author: Westbrook, J. H.
Author: Wood, D. L.
Corporate Author: General Electric Research Laboratory
Laboratory: Directorate of Materials and Processes
Date of Publication: 1962-07
Pages: 37
Contract: AF 33(616)-7714
Project: 7350
Task: 735001
AD Number: AD0286880

An increased hardness of grain boundary regions above that of the bulk material is found to exist generally in intermetallic compounds having a stoichiometric excess of active metal component. This hardening is shown to be associated with the anomalously high brittle-ductile transition temperature in these materials, and to be related to the "pest" phenomenon. The presence of adsorbed oxygen and/or nitrogen in grain boundary regions is found to be responsible for the increased hardness in these areas; the precise manner in which the resistance to plastic deformation is increased by this phenomenon is not clear. The effect can be modified, however, by ternary solute additions and to some extent by appropriate annealing treatments.

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