Published July 14, 2008
| Version v1
Journal article
Effects of alloying elements on dendritic segregation in iridium alloys
- 1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996 (United States)
- 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China)
- 3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
Description
The effects of alloying elements on dendritic segregation in Ir alloys were studied by Auger Electron Spectroscopy (AES). The addition of 10 at.% Nb induces significant segregation of carbon and thorium to dendritic interfaces. The addition of 5 at.% Zr to the Ir alloy leads to the formation of an Ir3Zr intermetallic phase, which results in less dendritic segregation of carbon and thorium. This dendritic segregation appears to be linked to the severe cracking observed in the Ir-Nb alloy, but not in the Ir-Zr alloy, after casting and heat treatment. The mechanism for the dendritic segregation was discussed by consideration of the solidification process and the change of carbon solubility in Ir by Zr addition
Availability note (English)
Available from http://dx.doi.org/10.1016/j.jallcom.2007.04.252Additional details
Identifiers
- DOI
- 10.1016/j.jallcom.2007.04.252;
- PII
- S0925-8388(07)01079-1;
Publishing Information
- Journal Title
- Journal of Alloys and Compounds
- Journal Volume
- 459
- Journal Issue
- 1-2
- Journal Page Range
- p. 130-134
- ISSN
- 0925-8388
- CODEN
- JALCEU
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40013257
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- AUGER ELECTRON SPECTROSCOPY; CARBON; CASTINGS; DENDRITES; GRAIN BOUNDARIES; HEAT TREATMENTS; INTERFACES; INTERMETALLIC COMPOUNDS; IRIDIUM ALLOYS; NIOBIUM ALLOYS; PHOTOELECTRON SPECTROSCOPY; SEGREGATION; SOLIDIFICATION; SOLUBILITY; THORIUM; ZIRCONIUM ALLOYS
- Descriptors DEC
- ACTINIDES; ALLOYS; CRYSTALS; ELECTRON SPECTROSCOPY; ELEMENTS; METALS; MICROSTRUCTURE; NONMETALS; PHASE TRANSFORMATIONS; PLATINUM METAL ALLOYS; SPECTROSCOPY; TRANSITION ELEMENT ALLOYS
Optional Information
- Copyright
- Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.