Advances in iridium alloy processing in 1987
A new process for the production of DOP-26 iridium alloy blanks is being evaluated and optimized. The alloy is prepared by electron-beam (EB) melting of Ir-0.3% W powder compacts followed by doping with aluminum and thorium by arc melting. Drop-cast alloy rod segments are EB welded to produce an electrode that is consumable arc melted to produce an ingot for extrusion and subsequent rolling. Initial results showed rejections for ultrasonic indications of alloy blanks produced by this process to be very low. Subsequently, some ingots have exhibited delaminations in the sheet, leading to rejection rates similar to that obtained in the standard process. The increase in delaminations is related to near-surface porosity in the consumable arc-melted ingot. A number of modifications to the arc-melting process and plans for further experimental work are described. In addition, the tensile properties of the DOP-26 iridium alloys have been measured over a range of test temperatures and strain rates. A laboratory evaluation of alternative cleaning procedures indicates that electrolytic dissolution of DOP-26 iridium alloy in an HCl solution is a potential substitute to the KCN process now in use. 7 refs., 13 figs., 6 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6800424
- Report Number(s):
- ORNL/TM-10852; ON: DE89001147
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ACTINIDES
ALLOYS
ALUMINIUM
CLEANING
CRYSTAL STRUCTURE
DOPED MATERIALS
ELECTRON BEAM MELTING
ELEMENTS
HEAT TREATMENTS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRIDIUM ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MELTING
METALS
MICROSTRUCTURE
NESDPS Office of Nuclear Energy Space and Defense Power Systems
PHASE TRANSFORMATIONS
PLATINUM METAL ALLOYS
POROSITY
POWDERS
PROCESSING
RECRYSTALLIZATION
SURFACES
TEMPERATURE DEPENDENCE
THORIUM