2004年4月
Simultaneous breakaway of a dislocation from several pinning points
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- 巻
- 370
- 号
- 1-2
- 開始ページ
- 230
- 終了ページ
- 233
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1016/j.msea.2003.01.008
- 出版者・発行元
- ELSEVIER SCIENCE SA
The amplitude-dependent internal friction (ADIF) of very pure aluminum (99.9999%) and Al dilute alloys (20-100 ppm) has been measured at temperatures between 2 and 240 K. Two universal properties have been found in the temperature dependence of the required stress amplitude for a constant decrement. At relatively low temperatures (or high stress amplitude), the decrease of the stress with increasing temperature is proportional to T-2/3 down to 65% of the stress for 0 K, and then deviates from the T-2/3 dependence. It is explained that the elementary process is due to unpinning of a dislocation from a single solute atom. The interaction potential has been determined successfully from this region (above 40% of the stress at 0 K). At relatively high temperatures (or stress less than 40% of that for 0 K), we find for the first time that the stress changes as proportional to T-1 for all dilute Al alloys but for a pure At crystal. It is explained that the elementary process is due to simultaneous unpinning of a dislocation from several solute atoms for dilute alloys. (C) 2003 Elsevier B.V. All rights reserved.
- リンク情報
- ID情報
-
- DOI : 10.1016/j.msea.2003.01.008
- ISSN : 0921-5093
- Web of Science ID : WOS:000221238500045