DEFORMATION MODELING OF IRIDIUM DOP-26 ALLOY TO DETERMINE POTENTIAL FOR SECONDARY RECRYSTALLIZATION
The DOP-26 iridium alloy (Ir-0.3%W-0.006%Th-0.005% Al) contains a distribution of thorium-containing intermetallic particles, typically less than 1 micrometer in size, which serve to pin grain boundaries. The alloy is thus subject to secondary recrystallization during long-term exposure at elevated temperature if prior plastic strains are within a critical range. A finite element method was used to model the deformation and resulting local plastic strains introduced by sizing operations on recrystallized iridium alloy cups. The results of the analysis show that local strains introduced by the deformation of cups are in all cases maintained below 0.025, the lower critical level for secondary recrystallization at 1600 K. The effects of die clearance and applied load on local plastic strain values were also treated.
- Publication Date:
- OSTI Identifier:
- DOE Contract Number:
- Resource Type:
- Resource Relation:
- Conference: International Conference on Tungsten, Refractory, and Hard Materials VII, Washington DC, DC, USA, 20080608, 20080612
- Research Org:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Org:
- NE USDOE - Office of Nuclear Energy
- Country of Publication:
- United States
- 36 MATERIALS SCIENCE; ALLOYS; CLEARANCE; DEFORMATION; DISTRIBUTION; FINITE ELEMENT METHOD; GRAIN BOUNDARIES; IRIDIUM; IRIDIUM ALLOYS; PLASTICS; RECRYSTALLIZATION; SIMULATION; SIZE; STRAINS; TUNGSTEN
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