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Neutron diffraction measurements of a thermally fatigued single crystal superalloy
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Guang-Ai, Sun, Bo, Chen, Er-Dong, Wu, Jin-Chao, Li., Pirling, T. and Hughes, Darren J. (2009) Neutron diffraction measurements of a thermally fatigued single crystal superalloy. Chinese Physics Letters, 26 (8). 086201. doi:10.1088/0256-307X/26/8/086201 ISSN 0256-307X.
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Official URL: http://dx.doi.org/10.1088/0256-307X/26/8/086201
Abstract
The thermally fatigued single crystal superalloy DZ125L is investigated by neutron diffraction measurements. The measurements, made using the phgr angle oscillating method, provide more detailed and reliable data than those with the phgr angle fixed. Diffraction studies show that the influence of thermal fatigue on the lattice parameters of the alloy is very limited. The stress analysis reveals that triaxial elastic hydrostatic stress plays a major role during thermal fatigue. The magnitude of the macrostress increases with the fatigue cycles, with the stress of the γ phase increasing more significantly than that of the γ' phase, and becoming fragile after many cycles. The changes in the microstrain are dependent on the reflection planes. The microstrains at the center of the sample are released by the thermal fatigue in comparison with those at the outlying locations, which has been attributed to the advance of the dislocation slips.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Journal or Publication Title: | Chinese Physics Letters | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0256-307X | ||||
Official Date: | 30 April 2009 | ||||
Dates: |
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Volume: | 26 | ||||
Number: | 8 | ||||
Article Number: | 086201 | ||||
DOI: | 10.1088/0256-307X/26/8/086201 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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