The high-temperature impact properties of DOP-26 iridium
- Los Alamos National Lab. in Los Alamos, NM (US)
A study of the impact properties of DOP-26 iridium (which contains 0.3% tungsten and --40 pm thorium) at temperatures of 600 to 1,440/sup 0/C revealed that the predominant mode of failure for the material is intergranular separation with occasional transgranular cleavage. DOP-26 iridium also appears to have a high notch sensitivity, in contrast to most other face-centered-cubic (fcc) metals; at elevated deformation temperatures, the dislocation substructure is similar to that of other fcc metals. In addition, regular arrays of pure edge character dislocations have been found. In the test specimens used in this study, the presence of Ir Th particles was observed within iridium grains. The existence of these particles indicates that the role of thorium is not well understood, particularly in light of the fact that previous studies, which depended on grain boundary segregation, have shown thorium to improve grain boundary cohesion.
- OSTI ID:
- 6485808
- Journal Information:
- J. Met.; (United States), Journal Name: J. Met.; (United States) Vol. 40:10; ISSN JOMTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ACTINIDES
ALLOYS
CRYSTAL STRUCTURE
DEFORMATION
ELEMENTS
GRAIN BOUNDARIES
HIGH TEMPERATURE
IMPACT STRENGTH
IRIDIUM ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NESDPS Office of Nuclear Energy Space and Defense Power Systems
PLATINUM METAL ALLOYS
TEMPERATURE EFFECTS
THORIUM
TRANSITION ELEMENTS
TUNGSTEN