Nanostructural evolution of Cr-rich precipitates in a Cu-Cr-Zr alloy during heat treatment studied by 3 dimensional atom probe

Masahiko Hatakeyama; Takeshi Toyama; Yasuyoshi Nagai; Masayuki Hasegawa; Morten Mostgaard Eldrup; Bachu Narain Singh

doi:10.2320/matertrans.MBW200736

Nanostructural evolution of Cr-rich precipitates in a Cu-Cr-Zr alloy during heat treatment studied by 3 dimensional atom probe

Masahiko Hatakeyama, Takeshi Toyama, Yasuyoshi Nagai, Masayuki Hasegawa, Morten Mostgaard Eldrup, Bachu Narain Singh

Tohoku University

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Nanostructural evolution of Cr (Cr-rich) precipitates in a Cu-0.78%Cr-0.13%Zr alloy has been studied after aging and overaging (reaging) by laser assisted local electrode 3 dimensional atom probe (Laser-LEAP). This material is a candidate for the first wall and divertor components of future fusion reactors. After prime aging at 460°C, Cr precipitates enriched with Zr were observed. Further reaging at 600°C caused the precipitates to grow to almost spherical Cr precipitates with 5 nm (1 h) in diameter and plate-like ones with 20 nm (4 h), respectively. Zr and impurities of Si and Fe were concentrated around the Cr precipitates, resulting in an almost pure Cr cores with interface regions enriched with Zr and the impurities. Probably, the strain induced by the incoherency of BCC Cr with matrix FCC Cu is relaxed by the formation of the enriched regions.

Original language	English
Journal	Materials Transactions
Volume	49
Issue number	3
Pages (from-to)	518-521
ISSN	1345-9678
DOIs	https://doi.org/10.2320/matertrans.MBW200736
Publication status	Published - 2008

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title = "Nanostructural evolution of Cr-rich precipitates in a Cu-Cr-Zr alloy during heat treatment studied by 3 dimensional atom probe",

abstract = "Nanostructural evolution of Cr (Cr-rich) precipitates in a Cu-0.78%Cr-0.13%Zr alloy has been studied after aging and overaging (reaging) by laser assisted local electrode 3 dimensional atom probe (Laser-LEAP). This material is a candidate for the first wall and divertor components of future fusion reactors. After prime aging at 460°C, Cr precipitates enriched with Zr were observed. Further reaging at 600°C caused the precipitates to grow to almost spherical Cr precipitates with 5 nm (1 h) in diameter and plate-like ones with 20 nm (4 h), respectively. Zr and impurities of Si and Fe were concentrated around the Cr precipitates, resulting in an almost pure Cr cores with interface regions enriched with Zr and the impurities. Probably, the strain induced by the incoherency of BCC Cr with matrix FCC Cu is relaxed by the formation of the enriched regions.",

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T1 - Nanostructural evolution of Cr-rich precipitates in a Cu-Cr-Zr alloy during heat treatment studied by 3 dimensional atom probe

AU - Hatakeyama, Masahiko

AU - Toyama, Takeshi

AU - Nagai, Yasuyoshi

AU - Hasegawa, Masayuki

AU - Eldrup, Morten Mostgaard

AU - Singh, Bachu Narain

PY - 2008

Y1 - 2008

N2 - Nanostructural evolution of Cr (Cr-rich) precipitates in a Cu-0.78%Cr-0.13%Zr alloy has been studied after aging and overaging (reaging) by laser assisted local electrode 3 dimensional atom probe (Laser-LEAP). This material is a candidate for the first wall and divertor components of future fusion reactors. After prime aging at 460°C, Cr precipitates enriched with Zr were observed. Further reaging at 600°C caused the precipitates to grow to almost spherical Cr precipitates with 5 nm (1 h) in diameter and plate-like ones with 20 nm (4 h), respectively. Zr and impurities of Si and Fe were concentrated around the Cr precipitates, resulting in an almost pure Cr cores with interface regions enriched with Zr and the impurities. Probably, the strain induced by the incoherency of BCC Cr with matrix FCC Cu is relaxed by the formation of the enriched regions.

AB - Nanostructural evolution of Cr (Cr-rich) precipitates in a Cu-0.78%Cr-0.13%Zr alloy has been studied after aging and overaging (reaging) by laser assisted local electrode 3 dimensional atom probe (Laser-LEAP). This material is a candidate for the first wall and divertor components of future fusion reactors. After prime aging at 460°C, Cr precipitates enriched with Zr were observed. Further reaging at 600°C caused the precipitates to grow to almost spherical Cr precipitates with 5 nm (1 h) in diameter and plate-like ones with 20 nm (4 h), respectively. Zr and impurities of Si and Fe were concentrated around the Cr precipitates, resulting in an almost pure Cr cores with interface regions enriched with Zr and the impurities. Probably, the strain induced by the incoherency of BCC Cr with matrix FCC Cu is relaxed by the formation of the enriched regions.

KW - Energiteknologier på vej

U2 - 10.2320/matertrans.MBW200736

DO - 10.2320/matertrans.MBW200736

M3 - Journal article

SN - 1345-9678

VL - 49

SP - 518

EP - 521

JO - Materials Transactions

JF - Materials Transactions

IS - 3

ER -

Nanostructural evolution of Cr-rich precipitates in a Cu-Cr-Zr alloy during heat treatment studied by 3 dimensional atom probe

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