Effects of alloying elements on dendritic segregation in iridium alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

6 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)130-134
Journal / PublicationJournal of Alloys and Compounds
Volume459
Issue number1-2
Publication statusPublished - 14 Jul 2008
Externally publishedYes

Abstract

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. © 2007 Elsevier B.V. All rights reserved.

Research Area(s)

  • Composition fluctuations, Grain boundaries, High temperature alloys, Photoelectron spectroscopy

Citation Format(s)

Effects of alloying elements on dendritic segregation in iridium alloys. / Liu, Y.; Liu, C. T.; Heatherly, L.; George, E. P.

In: Journal of Alloys and Compounds, Vol. 459, No. 1-2, 14.07.2008, p. 130-134.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review