Effect of Ta on microstructure and phase distribution in cyclic oxidized Ir-Ta modified aluminide coatings on nickel base single crystal superalloy

P. Kuppusami, Hideyuki Murakami

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The effect of Ir-Ta coating (with varying amounts of Ta) on microstructure, composition variation and phase distribution in the modified aluminides on Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation has been investigated. Ir-Ta coatings with Ta = 14.1, 23.1, 40.7 and 82.9 at.% deposited on 〈1 0 0〉 oriented nickel base single crystal superalloy, TMS-75 were aluminized and subjected to cyclic oxidation at 1373 K, for 600 h. The mass gain as a function of number of cycles data demonstrates an improved oxidation resistance with decreasing Ta content. In contrary to Ta-rich aluminides, Ir-rich aluminides show a large volume fraction of the β-phase, a less amount of γ′-Ni3Al phase near the surface of the coatings. Rapid decrease in the concentration of Al in the diffusion zone and formation of interconnected γ′-Ni3Al has been found to be responsible for the lower oxidation resistance of Ta-rich aluminides.

Original languageEnglish
Pages (from-to)254-261
Number of pages8
JournalMaterials Science and Engineering A
Volume452-453
DOIs
Publication statusPublished - 2007 Apr 15
Externally publishedYes

Fingerprint

aluminides
heat resistant alloys
Nickel
Superalloys
Oxidation resistance
Single crystals
nickel
coatings
Coatings
microstructure
Microstructure
oxidation resistance
single crystals
Oxidation
oxidation
Volume fraction
Chemical analysis
cycles

Keywords

  • Aluminide
  • Diffusion
  • Iridium
  • Microstructure
  • Oxidation
  • Tantalum

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

@article{3a50fc3cc5f74697842bd6862b97ea4a,
title = "Effect of Ta on microstructure and phase distribution in cyclic oxidized Ir-Ta modified aluminide coatings on nickel base single crystal superalloy",
abstract = "The effect of Ir-Ta coating (with varying amounts of Ta) on microstructure, composition variation and phase distribution in the modified aluminides on Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation has been investigated. Ir-Ta coatings with Ta = 14.1, 23.1, 40.7 and 82.9 at.{\%} deposited on 〈1 0 0〉 oriented nickel base single crystal superalloy, TMS-75 were aluminized and subjected to cyclic oxidation at 1373 K, for 600 h. The mass gain as a function of number of cycles data demonstrates an improved oxidation resistance with decreasing Ta content. In contrary to Ta-rich aluminides, Ir-rich aluminides show a large volume fraction of the β-phase, a less amount of γ′-Ni3Al phase near the surface of the coatings. Rapid decrease in the concentration of Al in the diffusion zone and formation of interconnected γ′-Ni3Al has been found to be responsible for the lower oxidation resistance of Ta-rich aluminides.",
keywords = "Aluminide, Diffusion, Iridium, Microstructure, Oxidation, Tantalum",
author = "P. Kuppusami and Hideyuki Murakami",
year = "2007",
month = "4",
day = "15",
doi = "10.1016/j.msea.2006.10.162",
language = "English",
volume = "452-453",
pages = "254--261",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Effect of Ta on microstructure and phase distribution in cyclic oxidized Ir-Ta modified aluminide coatings on nickel base single crystal superalloy

AU - Kuppusami, P.

AU - Murakami, Hideyuki

PY - 2007/4/15

Y1 - 2007/4/15

N2 - The effect of Ir-Ta coating (with varying amounts of Ta) on microstructure, composition variation and phase distribution in the modified aluminides on Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation has been investigated. Ir-Ta coatings with Ta = 14.1, 23.1, 40.7 and 82.9 at.% deposited on 〈1 0 0〉 oriented nickel base single crystal superalloy, TMS-75 were aluminized and subjected to cyclic oxidation at 1373 K, for 600 h. The mass gain as a function of number of cycles data demonstrates an improved oxidation resistance with decreasing Ta content. In contrary to Ta-rich aluminides, Ir-rich aluminides show a large volume fraction of the β-phase, a less amount of γ′-Ni3Al phase near the surface of the coatings. Rapid decrease in the concentration of Al in the diffusion zone and formation of interconnected γ′-Ni3Al has been found to be responsible for the lower oxidation resistance of Ta-rich aluminides.

AB - The effect of Ir-Ta coating (with varying amounts of Ta) on microstructure, composition variation and phase distribution in the modified aluminides on Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation has been investigated. Ir-Ta coatings with Ta = 14.1, 23.1, 40.7 and 82.9 at.% deposited on 〈1 0 0〉 oriented nickel base single crystal superalloy, TMS-75 were aluminized and subjected to cyclic oxidation at 1373 K, for 600 h. The mass gain as a function of number of cycles data demonstrates an improved oxidation resistance with decreasing Ta content. In contrary to Ta-rich aluminides, Ir-rich aluminides show a large volume fraction of the β-phase, a less amount of γ′-Ni3Al phase near the surface of the coatings. Rapid decrease in the concentration of Al in the diffusion zone and formation of interconnected γ′-Ni3Al has been found to be responsible for the lower oxidation resistance of Ta-rich aluminides.

KW - Aluminide

KW - Diffusion

KW - Iridium

KW - Microstructure

KW - Oxidation

KW - Tantalum

UR - http://www.scopus.com/inward/record.url?scp=33847311300&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847311300&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2006.10.162

DO - 10.1016/j.msea.2006.10.162

M3 - Article

AN - SCOPUS:33847311300

VL - 452-453

SP - 254

EP - 261

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -