The high-temperature impact properties of DOP-26 iridium

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · J. Met.; (United States)

DOI:https://doi.org/10.1007/BF03257981· OSTI ID:6485808

George, T G; Stevens, M F ^[1]

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1. 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), Vol. 40:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRIDIUM ALLOYS
IMPACT STRENGTH
THORIUM
METALLURGICAL EFFECTS
DEFORMATION
GRAIN BOUNDARIES
HIGH TEMPERATURE
TEMPERATURE EFFECTS
TUNGSTEN
ACTINIDES
ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
PLATINUM METAL ALLOYS
TRANSITION ELEMENTS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies