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Changes in Microstructure and Mechanical Properties during Solid Sintering of Ni–Al Mixed Powder Compact

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Title: Changes in Microstructure and Mechanical Properties during Solid Sintering of Ni–Al Mixed Powder Compact
Authors: Matsuura, Kiyotaka Browse this author →KAKEN DB
Kitamura, Toshiki Browse this author
Kudoh, Masayuki Browse this author
Itoh, Youichi Browse this author
Keywords: powder metallurgy
reactive sintering
intermetallic compound
nickel aluminide
mechanical properties
hot press
Issue Date: May-1996
Publisher: The Japan Institute of Metals
Journal Title: Materials Transactions, JIM
Volume: 37
Issue: 5
Start Page: 1067
End Page: 1072
Publisher DOI: 10.2320/matertrans1989.37.1067
Abstract: Low temperature reactive sintering of Ni–Al mixed powder compact is performed, and the effects of temperature, time and pressure of sintering on the microstructure, density, hardness and ductility of the compact at room temperature are investigated. During sintering, intermetallic phases and pores are formed and grow. The growth of the former increases the hardness of the compact, while the growth of the latter reduces the density. The volume fraction of aluminum phase decreases in accordance with the parabolic law, and the parabolic rate constant is described as k=3000exp(−60400R−1T−1) where R and T are the gas constant and absolute temperature. The ductility of the compact, evaluated by the critical rolling reduction, dramatically increases by short sintering and then gradually decreases with sintering time. The increase in the ductility is caused by the diffusion junction at the interface between powder particles, while the decrease by the formation of intermetallic compound phases at the interface. Application of pressure to the compact during sintering brings about remarkable increase in the density and hardness of the compact.
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: 松浦 清隆

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