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| Naji, M. |
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| Petrov, R. H. | Madrid |
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Schäublin, Robin
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Publications (9/9 displayed)
- 2020Mechanism of low temperature deformation in aluminium alloyscitations
- 2019Biocorrosion zoomed in: evidence for dealloying of nanometric intermetallic particles in magnesium alloyscitations
- 2019Laser additive manufacturing of biodegradable magnesium alloy WE43citations
- 2019Exceptional Strengthening of Biodegradable Mg-Zn-Ca Alloys through High Pressure Torsion and Subsequent Heat Treatmentcitations
- 2017Unraveling thermodynamics, stability, and oxygen evolution activity of strontium ruthenium perovskite oxidecitations
- 2017Dynamic surface self-reconstruction is the key of highly active perovskite nano-electrocatalysts for water splittingcitations
- 2015Surface damage in TEM thick α-Fe samples by implantation with 150 keV Fe ionscitations
- 2015Surface-induced vacancy loops and damage dispersion in irradiated Fe thin filmscitations
- 2012Processing and characterization of a W–2Y material for fusion power reactorscitations
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article
Mechanism of low temperature deformation in aluminium alloys
Abstract
This study investigates differences in the deformation mechanisms between room temperature (296 K) and cryogenic temperatures (77 K) and their advantages for low temperature formability in alloys EN AW 1085, EN AW 5182 and EN AW 6016. Compared to room temperature behaviour, tensile tests showed an overall increase in yield strength, ultimate tensile strength and uniform elongation with differences among the principal alloy types. In general, the improved mechanical properties result from higher strain hardening rates at lower temperatures. The application of an extended Kocks-Mecking approach showed a significant reduction of the dynamic recovery and suggested higher dislocation densities upon cryogenic deformation. This was confirmed via in-situ synchrotron experiments, which also reveal a higher proportion of screw dislocations. Moreover, kernel average misorientation maps from electron backscattered diffraction and in-situ cryogenic deformation in a transmission electron microscope displayed a more uniform dislocation arrangement with a reduction of slip lines and less highly misaligned areas after deformation at lower temperatures. Supported by a detailed characterization of the microstructure and its dislocation structure, the associated fundamental mechanisms we reveal, which are at the origin of the exceptional improvement in mechanical properties, are extensively discussed.