Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574824 | Materials Science and Engineering: A | 2014 | 24 Pages |
Abstract
By means of creep properties measurement and microstructure observation, combined with the contrast analysis of dislocation configurations, an investigation has been made into the effects of the element Re on the deformation mechanisms within the γⲠphase of single crystal nickel-based superalloys during creep at elevated temperatures. Results show that, compared to free-Re superalloy, 2% Re alloy at 980 °C displays a lower strain rate and better creep resistance. In the later stage of creep at 980 °C, the deformation feature of the free-Re superalloy is the ã110ã super-dislocation shearing into the rafted γⲠphase and slipping on {111} planes, and the Kear-Wilsdorf (KW) locks are formed within the γⲠphase of 2% Re single crystal nickel-based superalloy. And the dislocations in KW locks in Re-containing superalloy under thermal activation may be re-activated for slipping on {111} planes to release the KW locks as the creep temperature further increases to 1070 °C.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Sugui Tian, Jing Wu, Delong Shu, Yong Su, Huichen Yu, Benjiang Qian,