Ternary interdiffusion in L12-Ni3Al with Ir alloying addition

M. Ode, N. Garimella, M. Ikeda, Hideyuki Murakami, Y. H. Sohn

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Average ternary interdiffusion coefficients in Ni3Al with Ir additions have been determined using solid-to-solid diffusion couples annealed at 1200°C for 5 hours. Disc shaped alloy specimens were prepared by the vacuum arc melting at compositions of Ni-24Al, Ni-25Al, Ni-26Al, Ni-23.5Al-1Ir, Ni-24.5Al-1Ir, Ni-23Al-2Ir, Ni-23Al-2Ir, Ni-24Al-2Ir, Ni-23Al-3Ir (at.%). Surfaces of alloys were polished down to 1200 grit and diffusion couples were assembled in Si3N4 jig for initial bonding heat treatment at 1200°C for 0.5 hours. Additional diffusion anneal was carried out at 1200°C for 4.5 hours outside of Si3N4 jig so that diffusion couples can be water quenched. Concentration profiles of individual components were measured by electron probe microanalysis using pure standard of Ni, Al and Ir. Interdiffusion flux of individual component was determined directly from the experimental concentration profiles, and the moments of interdiffusion flux were examined to calculate the average ternary interdiffusion coefficients, D̃̄ij k either with Al or Ni as dependent component. Calculated interdiffusion coefficients suggest that Ir-alloyed Al2O3-forming oxidation resistant coatings would be beneficial to reduce the interdiffusion flux of Ni from superalloy substrates to the coating, and reduce the interdiffusion flux of Al from the coating to the superalloy substrate.

Original languageEnglish
Pages (from-to)637-642
Number of pages6
JournalDefect and Diffusion Forum
Volume273-276
Publication statusPublished - 2008 Jan 1
Externally publishedYes

Fingerprint

Alloying
alloying
jigs
Fluxes
Jigs
heat resistant alloys
Superalloys
coatings
Coatings
coefficients
vacuum melting
Diffusion in solids
grit
arc melting
Electron probe microanalysis
electron probes
Substrates
profiles
microanalysis
Melting

Keywords

  • High temperature alloys
  • Intermetallics
  • Ir
  • L1
  • NiAl
  • Ternary interdiffusion

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Ode, M., Garimella, N., Ikeda, M., Murakami, H., & Sohn, Y. H. (2008). Ternary interdiffusion in L12-Ni3Al with Ir alloying addition. Defect and Diffusion Forum, 273-276, 637-642.

Ternary interdiffusion in L12-Ni3Al with Ir alloying addition. / Ode, M.; Garimella, N.; Ikeda, M.; Murakami, Hideyuki; Sohn, Y. H.

In: Defect and Diffusion Forum, Vol. 273-276, 01.01.2008, p. 637-642.

Research output: Contribution to journalArticle

Ode, M, Garimella, N, Ikeda, M, Murakami, H & Sohn, YH 2008, 'Ternary interdiffusion in L12-Ni3Al with Ir alloying addition', Defect and Diffusion Forum, vol. 273-276, pp. 637-642.
Ode M, Garimella N, Ikeda M, Murakami H, Sohn YH. Ternary interdiffusion in L12-Ni3Al with Ir alloying addition. Defect and Diffusion Forum. 2008 Jan 1;273-276:637-642.
Ode, M. ; Garimella, N. ; Ikeda, M. ; Murakami, Hideyuki ; Sohn, Y. H. / Ternary interdiffusion in L12-Ni3Al with Ir alloying addition. In: Defect and Diffusion Forum. 2008 ; Vol. 273-276. pp. 637-642.
@article{7db203f6f9344d65b17379169ce78719,
title = "Ternary interdiffusion in L12-Ni3Al with Ir alloying addition",
abstract = "Average ternary interdiffusion coefficients in Ni3Al with Ir additions have been determined using solid-to-solid diffusion couples annealed at 1200°C for 5 hours. Disc shaped alloy specimens were prepared by the vacuum arc melting at compositions of Ni-24Al, Ni-25Al, Ni-26Al, Ni-23.5Al-1Ir, Ni-24.5Al-1Ir, Ni-23Al-2Ir, Ni-23Al-2Ir, Ni-24Al-2Ir, Ni-23Al-3Ir (at.{\%}). Surfaces of alloys were polished down to 1200 grit and diffusion couples were assembled in Si3N4 jig for initial bonding heat treatment at 1200°C for 0.5 hours. Additional diffusion anneal was carried out at 1200°C for 4.5 hours outside of Si3N4 jig so that diffusion couples can be water quenched. Concentration profiles of individual components were measured by electron probe microanalysis using pure standard of Ni, Al and Ir. Interdiffusion flux of individual component was determined directly from the experimental concentration profiles, and the moments of interdiffusion flux were examined to calculate the average ternary interdiffusion coefficients, D̃̄ij k either with Al or Ni as dependent component. Calculated interdiffusion coefficients suggest that Ir-alloyed Al2O3-forming oxidation resistant coatings would be beneficial to reduce the interdiffusion flux of Ni from superalloy substrates to the coating, and reduce the interdiffusion flux of Al from the coating to the superalloy substrate.",
keywords = "High temperature alloys, Intermetallics, Ir, L1, NiAl, Ternary interdiffusion",
author = "M. Ode and N. Garimella and M. Ikeda and Hideyuki Murakami and Sohn, {Y. H.}",
year = "2008",
month = "1",
day = "1",
language = "English",
volume = "273-276",
pages = "637--642",
journal = "Diffusion and Defect Data. Pt A Defect and Diffusion Forum",
issn = "1012-0386",
publisher = "Trans Tech Publications",

}

TY - JOUR

T1 - Ternary interdiffusion in L12-Ni3Al with Ir alloying addition

AU - Ode, M.

AU - Garimella, N.

AU - Ikeda, M.

AU - Murakami, Hideyuki

AU - Sohn, Y. H.

PY - 2008/1/1

Y1 - 2008/1/1

N2 - Average ternary interdiffusion coefficients in Ni3Al with Ir additions have been determined using solid-to-solid diffusion couples annealed at 1200°C for 5 hours. Disc shaped alloy specimens were prepared by the vacuum arc melting at compositions of Ni-24Al, Ni-25Al, Ni-26Al, Ni-23.5Al-1Ir, Ni-24.5Al-1Ir, Ni-23Al-2Ir, Ni-23Al-2Ir, Ni-24Al-2Ir, Ni-23Al-3Ir (at.%). Surfaces of alloys were polished down to 1200 grit and diffusion couples were assembled in Si3N4 jig for initial bonding heat treatment at 1200°C for 0.5 hours. Additional diffusion anneal was carried out at 1200°C for 4.5 hours outside of Si3N4 jig so that diffusion couples can be water quenched. Concentration profiles of individual components were measured by electron probe microanalysis using pure standard of Ni, Al and Ir. Interdiffusion flux of individual component was determined directly from the experimental concentration profiles, and the moments of interdiffusion flux were examined to calculate the average ternary interdiffusion coefficients, D̃̄ij k either with Al or Ni as dependent component. Calculated interdiffusion coefficients suggest that Ir-alloyed Al2O3-forming oxidation resistant coatings would be beneficial to reduce the interdiffusion flux of Ni from superalloy substrates to the coating, and reduce the interdiffusion flux of Al from the coating to the superalloy substrate.

AB - Average ternary interdiffusion coefficients in Ni3Al with Ir additions have been determined using solid-to-solid diffusion couples annealed at 1200°C for 5 hours. Disc shaped alloy specimens were prepared by the vacuum arc melting at compositions of Ni-24Al, Ni-25Al, Ni-26Al, Ni-23.5Al-1Ir, Ni-24.5Al-1Ir, Ni-23Al-2Ir, Ni-23Al-2Ir, Ni-24Al-2Ir, Ni-23Al-3Ir (at.%). Surfaces of alloys were polished down to 1200 grit and diffusion couples were assembled in Si3N4 jig for initial bonding heat treatment at 1200°C for 0.5 hours. Additional diffusion anneal was carried out at 1200°C for 4.5 hours outside of Si3N4 jig so that diffusion couples can be water quenched. Concentration profiles of individual components were measured by electron probe microanalysis using pure standard of Ni, Al and Ir. Interdiffusion flux of individual component was determined directly from the experimental concentration profiles, and the moments of interdiffusion flux were examined to calculate the average ternary interdiffusion coefficients, D̃̄ij k either with Al or Ni as dependent component. Calculated interdiffusion coefficients suggest that Ir-alloyed Al2O3-forming oxidation resistant coatings would be beneficial to reduce the interdiffusion flux of Ni from superalloy substrates to the coating, and reduce the interdiffusion flux of Al from the coating to the superalloy substrate.

KW - High temperature alloys

KW - Intermetallics

KW - Ir

KW - L1

KW - NiAl

KW - Ternary interdiffusion

UR - http://www.scopus.com/inward/record.url?scp=40949140656&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=40949140656&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:40949140656

VL - 273-276

SP - 637

EP - 642

JO - Diffusion and Defect Data. Pt A Defect and Diffusion Forum

JF - Diffusion and Defect Data. Pt A Defect and Diffusion Forum

SN - 1012-0386

ER -