The d0-distribution in Al-2024 friction stir welds
| Autor: | R. Burguete, Axel Steuwer, Philip J. Withers |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Metallurgy Synchrotron radiation Welding Microstructure law.invention Stress (mechanics) Lattice constant Nuclear Energy and Engineering Residual stress law visual_art Ultimate tensile strength Aluminium alloy visual_art.visual_art_medium Composite material |
| Zdroj: | Journal of Neutron Research. 9:345-350 |
| ISSN: | 1023-8166 |
| DOI: | 10.1080/10238160108200161 |
| Popis: | Neutron and synchrotron radiation have been employed to create 2D maps of the variation of strains and the unstrained lattice spacing d 0 in longitudinal and transverse direction over a cross-section of a friction stir weld (FSW) of an aluminium alloy AA-2024. Strains have been measured directly in the FSW using neutrons. The variation of the unstrained lattice parameter has been measured with synchrotrons on specially prepared stress-relaxed 'combs' of the original weld. The variation of d 0 across the weld varies on the same scale as the strains on a magnitude of ∼1000 μ;epsilon; thus influencing greatly the magnitude of inferred residual stresses in the sample. Both the d 0 variation and strain map show detailed features reflecting the characteristic microstructure generated during the welding process. In particular, they are asymmetric about the weld centre-line. The dominant longitudinal residual stress field is tensile beneath the edge of the tool and compressive in the weld centre-line. Tr... |
| Databáze: | OpenAIRE |
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