High Temperature Ordered Intermetallic Alloys

The subject continues to enjoy the attention of a large number of theorists interested in understanding the tendency for brittleness in intermetallics. Some intermetallics are brittle because of a lack of a sufficient number of slip systems while others have a more than adequate number. Materials of...

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Bibliographic Details
Main Authors: Ballance, John B, Stiegler, James O, Pope, David P
Format: Report
Language:English
Subjects:
BRITTLENESS
DISLOCATIONS
ENERGY
ENGINEERING
FAULTS
INTERSTITIAL
MECHANICAL PROPERTIES
Metallurgy and Metallography
WUAFOSR2305A9
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Summary:The subject continues to enjoy the attention of a large number of theorists interested in understanding the tendency for brittleness in intermetallics. Some intermetallics are brittle because of a lack of a sufficient number of slip systems while others have a more than adequate number. Materials of the former type are receiving more attention than the latter from theorists, most of whom are attempting to find ways to decrease specific fault energies and thereby encourage the formation of specific dislocations, dislocation pairs separated by APB in NiAl. To date these theoretical attempts have been unsuccessful, although there are increasing reasons for hope of future successes. The properties of TiAl-based alloys received a great deal of attention, both from a scientific and from an engineering point of view. The role of interstitials in controlling microstructure and subsequent mechanical properties is becoming recognized as very important, just as in disordered Ti- based and Ti3Al-based alloys.