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γ' Precipitation and Growth Kinetics in Mechanically Alloyed Ni-Al

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Title: γ' Precipitation and Growth Kinetics in Mechanically Alloyed Ni-Al
Authors: Tang, QingXin Browse this author
Ukai, Shigeharu Browse this author →KAKEN DB
Minami, Akinobu Browse this author
Hayashi, Shigenari Browse this author
Issue Date: 2011
Publisher: Hindawi Publishing Corporation
Journal Title: Advances in Materials Science and Engineering
Volume: 2011
Start Page: 137387
Publisher DOI: 10.1155/2011/137387
Abstract: The precipitation and growth kinetics ofγ' 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℃. 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.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鵜飼 重治

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