|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
Changes in Microstructure and Mechanical Properties during Solid Sintering of Ni–Al Mixed Powder Compact
| 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 | | ductility | | 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 |
| URI: | http://hdl.handle.net/2115/75807 |
| 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
|
