X-ray microbeam mapping of microtexture related to fatigue crack asperities in Al-Li 2090
- Georgia Inst. of Tech., Atlanta, GA (United States)
In certain orientations, Al-Li 2090 T8E41 cracks more slowly in fatigue than other aluminum alloys due to roughness-induced closure linked to the average texture or macrotexture. For this application, three-dimensional, non-destructive measurement of microtexture and strain evolution within samples was developed using synchrotron polychromatic X-ray microbeam diffraction; its use in mapping the microtexture of fatigue crack asperities in Al-Li 2090 are reported. Groups of adjacent grains with nearly identical orientations were found at numerous locations in the plate centers, and this type of mesotexture appeared closely tied to asperity formation. Changing arrangements of 111 diffraction spots relative to the samples rolling and crack propagation directions are found to correspond to the transitions between a relatively planar section of the crack and an adjacent asperity.
- OSTI ID:
- 651107
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 13 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Micro-, meso- and macro-texture and fatigue crack roughness in Al-Li 2090 T8E41
Mesotexture, deflection and closure of fatigue cracks in Al-Li 2090 T8E41