𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al

𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al

The precipitation and growth kinetics of γ′ precipitates, which are strengthening factors in Ni-base oxide dispersion strengthened (ODS) superalloys, were investigated. The cuboidal-type γ′ precipitates are formed in conventional arc-melted Ni–Al alloys, whereas spherical-type precipitates are forme...

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Main Authors: QingXin Tang, Shigeharu Ukai, Akinobu Minami, Shigenari Hayashi
Format: Article
Language:English
Published: Hindawi Limited 2011-01-01
Series:Advances in Materials Science and Engineering
Online Access:http://dx.doi.org/10.1155/2011/137387
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spelling doaj-5075cc18be0e41379950d7c84765b3592020-11-24T22:36:39ZengHindawi LimitedAdvances in Materials Science and Engineering1687-84341687-84422011-01-01201110.1155/2011/137387137387𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–AlQingXin Tang0Shigeharu Ukai1Akinobu Minami2Shigenari Hayashi3Materials Science and Engineering, Faculty of Engineering, Hokkaido University, N13, W-8, Kita-ku, Sapporo 060-8628, JapanMaterials Science and Engineering, Faculty of Engineering, Hokkaido University, N13, W-8, Kita-ku, Sapporo 060-8628, JapanMaterials Science and Engineering, Faculty of Engineering, Hokkaido University, N13, W-8, Kita-ku, Sapporo 060-8628, JapanMaterials Science and Engineering, Faculty of Engineering, Hokkaido University, N13, W-8, Kita-ku, Sapporo 060-8628, JapanThe precipitation and growth kinetics of γ′ precipitates, which are strengthening factors in Ni-base oxide dispersion strengthened (ODS) superalloys, were investigated. The cuboidal-type γ′ precipitates are formed in conventional arc-melted Ni–Al alloys, whereas spherical-type precipitates are formed in the mechanically alloyed (MAed) specimens. The morphology is controlled by a lattice misfit between the γ′ precipitates and the matrix at the aging temperature of 800°C. The growth kinetics of the γ′ precipitates can be followed by Ostwald ripening. The Arrhenius plot yielded a lower activation energy for the solute atom diffusion in MAed specimens, which is attributed to their high dislocation density and nanosized grains.http://dx.doi.org/10.1155/2011/137387
collection DOAJ
language English
format Article
sources DOAJ
author QingXin Tang
Shigeharu Ukai
Akinobu Minami
Shigenari Hayashi
spellingShingle QingXin Tang
Shigeharu Ukai
Akinobu Minami
Shigenari Hayashi
𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al
Advances in Materials Science and Engineering
author_facet QingXin Tang
Shigeharu Ukai
Akinobu Minami
Shigenari Hayashi
author_sort QingXin Tang
title 𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al
title_short 𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al
title_full 𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al
title_fullStr 𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al
title_full_unstemmed 𝜸′ Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al
title_sort 𝜸′ precipitation and growth kinetics in mechanically alloyed ni–al
publisher Hindawi Limited
series Advances in Materials Science and Engineering
issn 1687-8434
1687-8442
publishDate 2011-01-01
description The precipitation and growth kinetics of γ′ precipitates, which are strengthening factors in Ni-base oxide dispersion strengthened (ODS) superalloys, were investigated. The cuboidal-type γ′ precipitates are formed in conventional arc-melted Ni–Al alloys, whereas spherical-type precipitates are formed in the mechanically alloyed (MAed) specimens. The morphology is controlled by a lattice misfit between the γ′ precipitates and the matrix at the aging temperature of 800°C. The growth kinetics of the γ′ precipitates can be followed by Ostwald ripening. The Arrhenius plot yielded a lower activation energy for the solute atom diffusion in MAed specimens, which is attributed to their high dislocation density and nanosized grains.
url http://dx.doi.org/10.1155/2011/137387
work_keys_str_mv AT qingxintang γprecipitationandgrowthkineticsinmechanicallyalloyednial
AT shigeharuukai γprecipitationandgrowthkineticsinmechanicallyalloyednial
AT akinobuminami γprecipitationandgrowthkineticsinmechanicallyalloyednial
AT shigenarihayashi γprecipitationandgrowthkineticsinmechanicallyalloyednial
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