The effect of chromium and cobalt segregation at dislocations on nickel-based superalloys

Paraskevas Kontis; Zhuangming Li; David M. Collins; Jonathan Cormier; Dierk Raabe; Baptiste Gault

doi:10.1016/j.scriptamat.2017.10.005

The effect of chromium and cobalt segregation at dislocations on nickel-based superalloys

Paraskevas Kontis^*, Zhuangming Li, David M. Collins, Jonathan Cormier, Dierk Raabe, Baptiste Gault

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

Abstract

The segregation of solutes at dislocations in a polycrystalline and a single crystal nickel-based superalloy is studied. Our observations confirm the often assumed but yet unproven diffusion along dislocations via pipe diffusion. Direct observation and quantitative, near-atomic scale segregation of chromium and cobalt at dislocations within γ' precipitates and at interfacial dislocations leading to the partial or complete dissolution of γ' precipitates at elevated temperatures is presented. Our results allow us to elucidate the physical mechanism by which pipe diffusion initiates the undesirable dissolution of γ' precipitates.

Original language	English
Pages (from-to)	76-80
Number of pages	5
Journal	Scripta Materialia
Volume	145
Early online date	18 Oct 2017
DOIs	https://doi.org/10.1016/j.scriptamat.2017.10.005
Publication status	Published - 1 Mar 2018

Keywords

Atom probe tomography
Dissolution
Pipe diffusion
Rafting
Recrystallisation

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1016/j.scriptamat.2017.10.005

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title = "The effect of chromium and cobalt segregation at dislocations on nickel-based superalloys",

abstract = "The segregation of solutes at dislocations in a polycrystalline and a single crystal nickel-based superalloy is studied. Our observations confirm the often assumed but yet unproven diffusion along dislocations via pipe diffusion. Direct observation and quantitative, near-atomic scale segregation of chromium and cobalt at dislocations within γ' precipitates and at interfacial dislocations leading to the partial or complete dissolution of γ' precipitates at elevated temperatures is presented. Our results allow us to elucidate the physical mechanism by which pipe diffusion initiates the undesirable dissolution of γ' precipitates.",

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AU - Kontis, Paraskevas

AU - Li, Zhuangming

AU - Collins, David M.

AU - Cormier, Jonathan

AU - Raabe, Dierk

AU - Gault, Baptiste

PY - 2018/3/1

Y1 - 2018/3/1

N2 - The segregation of solutes at dislocations in a polycrystalline and a single crystal nickel-based superalloy is studied. Our observations confirm the often assumed but yet unproven diffusion along dislocations via pipe diffusion. Direct observation and quantitative, near-atomic scale segregation of chromium and cobalt at dislocations within γ' precipitates and at interfacial dislocations leading to the partial or complete dissolution of γ' precipitates at elevated temperatures is presented. Our results allow us to elucidate the physical mechanism by which pipe diffusion initiates the undesirable dissolution of γ' precipitates.

AB - The segregation of solutes at dislocations in a polycrystalline and a single crystal nickel-based superalloy is studied. Our observations confirm the often assumed but yet unproven diffusion along dislocations via pipe diffusion. Direct observation and quantitative, near-atomic scale segregation of chromium and cobalt at dislocations within γ' precipitates and at interfacial dislocations leading to the partial or complete dissolution of γ' precipitates at elevated temperatures is presented. Our results allow us to elucidate the physical mechanism by which pipe diffusion initiates the undesirable dissolution of γ' precipitates.

KW - Atom probe tomography

KW - Dissolution

KW - Pipe diffusion

KW - Rafting

KW - Recrystallisation

UR - http://www.scopus.com/inward/record.url?scp=85031775970&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2017.10.005

DO - 10.1016/j.scriptamat.2017.10.005

M3 - Article

AN - SCOPUS:85031775970

SN - 1359-6462

VL - 145

SP - 76

EP - 80

JO - Scripta Materialia

JF - Scripta Materialia

ER -

The effect of chromium and cobalt segregation at dislocations on nickel-based superalloys

Abstract

Keywords

ASJC Scopus subject areas

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