Temporal evolution of nanostructures in a model nickel-base superalloy

Experiments and simulations

Chantai K. Sudbrack*, Kevin E. Yoon, Zugang Mao, Ronald D. Noebe, Dieter Isheim, David N Seidman

*Corresponding author for this work

Research output: Contribution to conferencePaper

12 Citations (Scopus)

Abstract

The temporal evolution of the nanostructure of a model Ni-base superalloy (Ni-5.2 at.% Al-14,2 at.% Cr) is studied experimentally employing three-dimensional atom-probe (3DAP) microscopy in conjunction with kinetic Monte Carlo (KMC) simulations at 600°C. It is demonstrated that not only can the mean compositions of individual γ' (Ni3Al with the L12 structure) precipitates be measured but the Ni, Al, and Cr concentration profiles within the precipitates can also be determined for precipitates with a mean radius (〈r〉) as small as 0.85 nm. The three asymptotic time dependencies of the Lifshitz-Slyzov-Wagner (LSW) theory of coarsening (Ostwald ripening) are measured and found to deviate from its theoretical predictions; possible explanations for these discrepancies are discussed. At 0.25 hr. there is 3DAP microscope evidence for the presence of precipitates of another nickel-rich phase, ≈"Ni3Cr" (Ni3Cr1-xAlx), which exhibits short-range order (SRO) and that is metastable with respect to Ni3Al. This metastable phase is also found by KMC simulations and has the composition Ni3Cr1-xAlx, which is Ni-2.91 at.% Al-21.98 at.% Cr at 16 hours. Our results demonstrate that the decomposition of the primary γ (FCC) phase results in the concurrent formation of an ordered phase and a disordered phase by 0.25 hours.

Original languageEnglish (US)
Pages43-50
Number of pages8
StatePublished - Jun 30 2003
EventElectron Microscopy: Its Role in Materials Science - San Diego, CA, United States
Duration: Mar 2 2003Mar 6 2003

Other

OtherElectron Microscopy: Its Role in Materials Science
CountryUnited States
CitySan Diego, CA
Period3/2/033/6/03

Fingerprint

heat resistant alloys
Nickel
Superalloys
Precipitates
precipitates
Nanostructures
nickel
simulation
Experiments
Ostwald ripening
Kinetics
Metastable phases
kinetics
Coarsening
Chemical analysis
Microscopic examination
Microscopes
microscopes
microscopy
Decomposition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Sudbrack, C. K., Yoon, K. E., Mao, Z., Noebe, R. D., Isheim, D., & Seidman, D. N. (2003). Temporal evolution of nanostructures in a model nickel-base superalloy: Experiments and simulations. 43-50. Paper presented at Electron Microscopy: Its Role in Materials Science, San Diego, CA, United States.
Sudbrack, Chantai K. ; Yoon, Kevin E. ; Mao, Zugang ; Noebe, Ronald D. ; Isheim, Dieter ; Seidman, David N. / Temporal evolution of nanostructures in a model nickel-base superalloy : Experiments and simulations. Paper presented at Electron Microscopy: Its Role in Materials Science, San Diego, CA, United States.8 p.
@conference{dd6ee0fa6c6f4e72a0497c48a9d69edc,
title = "Temporal evolution of nanostructures in a model nickel-base superalloy: Experiments and simulations",
abstract = "The temporal evolution of the nanostructure of a model Ni-base superalloy (Ni-5.2 at.{\%} Al-14,2 at.{\%} Cr) is studied experimentally employing three-dimensional atom-probe (3DAP) microscopy in conjunction with kinetic Monte Carlo (KMC) simulations at 600°C. It is demonstrated that not only can the mean compositions of individual γ' (Ni3Al with the L12 structure) precipitates be measured but the Ni, Al, and Cr concentration profiles within the precipitates can also be determined for precipitates with a mean radius (〈r〉) as small as 0.85 nm. The three asymptotic time dependencies of the Lifshitz-Slyzov-Wagner (LSW) theory of coarsening (Ostwald ripening) are measured and found to deviate from its theoretical predictions; possible explanations for these discrepancies are discussed. At 0.25 hr. there is 3DAP microscope evidence for the presence of precipitates of another nickel-rich phase, ≈{"}Ni3Cr{"} (Ni3Cr1-xAlx), which exhibits short-range order (SRO) and that is metastable with respect to Ni3Al. This metastable phase is also found by KMC simulations and has the composition Ni3Cr1-xAlx, which is Ni-2.91 at.{\%} Al-21.98 at.{\%} Cr at 16 hours. Our results demonstrate that the decomposition of the primary γ (FCC) phase results in the concurrent formation of an ordered phase and a disordered phase by 0.25 hours.",
author = "Sudbrack, {Chantai K.} and Yoon, {Kevin E.} and Zugang Mao and Noebe, {Ronald D.} and Dieter Isheim and Seidman, {David N}",
year = "2003",
month = "6",
day = "30",
language = "English (US)",
pages = "43--50",
note = "Electron Microscopy: Its Role in Materials Science ; Conference date: 02-03-2003 Through 06-03-2003",

}

Sudbrack, CK, Yoon, KE, Mao, Z, Noebe, RD, Isheim, D & Seidman, DN 2003, 'Temporal evolution of nanostructures in a model nickel-base superalloy: Experiments and simulations' Paper presented at Electron Microscopy: Its Role in Materials Science, San Diego, CA, United States, 3/2/03 - 3/6/03, pp. 43-50.

Temporal evolution of nanostructures in a model nickel-base superalloy : Experiments and simulations. / Sudbrack, Chantai K.; Yoon, Kevin E.; Mao, Zugang; Noebe, Ronald D.; Isheim, Dieter; Seidman, David N.

2003. 43-50 Paper presented at Electron Microscopy: Its Role in Materials Science, San Diego, CA, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Temporal evolution of nanostructures in a model nickel-base superalloy

T2 - Experiments and simulations

AU - Sudbrack, Chantai K.

AU - Yoon, Kevin E.

AU - Mao, Zugang

AU - Noebe, Ronald D.

AU - Isheim, Dieter

AU - Seidman, David N

PY - 2003/6/30

Y1 - 2003/6/30

N2 - The temporal evolution of the nanostructure of a model Ni-base superalloy (Ni-5.2 at.% Al-14,2 at.% Cr) is studied experimentally employing three-dimensional atom-probe (3DAP) microscopy in conjunction with kinetic Monte Carlo (KMC) simulations at 600°C. It is demonstrated that not only can the mean compositions of individual γ' (Ni3Al with the L12 structure) precipitates be measured but the Ni, Al, and Cr concentration profiles within the precipitates can also be determined for precipitates with a mean radius (〈r〉) as small as 0.85 nm. The three asymptotic time dependencies of the Lifshitz-Slyzov-Wagner (LSW) theory of coarsening (Ostwald ripening) are measured and found to deviate from its theoretical predictions; possible explanations for these discrepancies are discussed. At 0.25 hr. there is 3DAP microscope evidence for the presence of precipitates of another nickel-rich phase, ≈"Ni3Cr" (Ni3Cr1-xAlx), which exhibits short-range order (SRO) and that is metastable with respect to Ni3Al. This metastable phase is also found by KMC simulations and has the composition Ni3Cr1-xAlx, which is Ni-2.91 at.% Al-21.98 at.% Cr at 16 hours. Our results demonstrate that the decomposition of the primary γ (FCC) phase results in the concurrent formation of an ordered phase and a disordered phase by 0.25 hours.

AB - The temporal evolution of the nanostructure of a model Ni-base superalloy (Ni-5.2 at.% Al-14,2 at.% Cr) is studied experimentally employing three-dimensional atom-probe (3DAP) microscopy in conjunction with kinetic Monte Carlo (KMC) simulations at 600°C. It is demonstrated that not only can the mean compositions of individual γ' (Ni3Al with the L12 structure) precipitates be measured but the Ni, Al, and Cr concentration profiles within the precipitates can also be determined for precipitates with a mean radius (〈r〉) as small as 0.85 nm. The three asymptotic time dependencies of the Lifshitz-Slyzov-Wagner (LSW) theory of coarsening (Ostwald ripening) are measured and found to deviate from its theoretical predictions; possible explanations for these discrepancies are discussed. At 0.25 hr. there is 3DAP microscope evidence for the presence of precipitates of another nickel-rich phase, ≈"Ni3Cr" (Ni3Cr1-xAlx), which exhibits short-range order (SRO) and that is metastable with respect to Ni3Al. This metastable phase is also found by KMC simulations and has the composition Ni3Cr1-xAlx, which is Ni-2.91 at.% Al-21.98 at.% Cr at 16 hours. Our results demonstrate that the decomposition of the primary γ (FCC) phase results in the concurrent formation of an ordered phase and a disordered phase by 0.25 hours.

UR - http://www.scopus.com/inward/record.url?scp=0038044705&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038044705&partnerID=8YFLogxK

M3 - Paper

SP - 43

EP - 50

ER -

Sudbrack CK, Yoon KE, Mao Z, Noebe RD, Isheim D, Seidman DN. Temporal evolution of nanostructures in a model nickel-base superalloy: Experiments and simulations. 2003. Paper presented at Electron Microscopy: Its Role in Materials Science, San Diego, CA, United States.