Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1503486 | Scripta Materialia | 2006 | 4 Pages |
Abstract
Thermo-mechanical fatigue of the [0 0 1]-oriented single crystal nickel base superalloy PWA-1480 was microstructurally investigated. Its superior fatigue property was evaluated in comparison with a single crystal nickel-base TMS-82 superalloy. During fatigue testing, a rafted γ/γⲠstructure formed parallel to the [0 0 1] stress axis in PWA-1480. The deposited dislocations in the γ/γⲠinterfaces lead to the appearance of misorientation (2-3°) locally between the γ and γⲠphases, resulting in a higher resistance for dislocation slip in the alloy. The rafted γ/γⲠstructure can also effectively obstruct the propagation of a crack.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
J.X. Zhang, H. Harada, Y. Ro, Y. Koizumi,