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| Naji, M. |
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Uggowitzer, Peter J.
Montanuniversität Leoben
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (62/62 displayed)
- 2024Unraveling the potential of Cu addition and cluster hardening in Al-Mg-Si alloyscitations
- 2024Influence of Solidification Rate and Impurity Content on 5/7-Crossover Alloys
- 2024Metallographic Etching of Al–Mg–Zn–(Cu) Crossover Alloyscitations
- 2024Comparative analysis of experimental techniques for microstructural characterization of novel nanostructured aluminium alloyscitations
- 2023Processing and microstructure–property relations of Al-Mg-Si-Fe crossover alloyscitations
- 2023Severe plastic deformation close to the melting point enables Mg-Fe nanocomposites with exceptional strengthcitations
- 2023In situ transmission electron microscopy as a toolbox for the emerging science of nanometallurgycitations
- 2023Assessment of different processing strategies to fabricate bulk Mg-Fe nanocompositescitations
- 2023Precipitation behaviour in AlMgZnCuAg crossover alloy with coarse and ultrafine grainscitations
- 2023Fine-grained aluminium crossover alloy for high-temperature sheet formingcitations
- 2023Strain-induced clustering in Al alloyscitations
- 2022High Fe content in Al-Mg-Si wrought alloys facilitates excellent mechanical propertiescitations
- 2022Stabilization of Al 3 Zr allotropes in dilute aluminum alloys via the addition of ternary elementscitations
- 2022Forging of an age-hardenable Mg–Al–Ca–Mn–Zn alloy on industrial scale
- 2022Precipitation in lean Mg–Zn–Ca alloyscitations
- 2022Mitigating the detrimental effects of galvanic corrosion by nanoscale composite architecture designcitations
- 2022MEMS-Based in situ electron-microscopy investigation of rapid solidification and heat treatment on eutectic Al-Cucitations
- 2022Alloy design strategy for microstructural-tailored scandium-modified aluminium alloys for additive manufacturingcitations
- 2022Closed die forging of a Mg-Al-Ca-Mn-Zn lean alloycitations
- 2021Synergistic alloy design concept for new high-strength Al–Mg–Si thick plate alloyscitations
- 2021Influence of Fe and Mn on the Microstructure Formation in 5xxx Alloys—Part II: Evolution of Grain Size and Texturecitations
- 2021Formation of Die Soldering and the Influence of Alloying Elements on the Intermetallic Interfacecitations
- 2021Giant hardening response in AlMgZn(Cu) alloyscitations
- 2021Influence of Fe and Mn on the Microstructure Formation in 5xxx Alloys—Part I: Evolution of Primary and Secondary Phasescitations
- 2020Prototypic Lightweight Alloy Design for Stellar-Radiation Environmentscitations
- 2020Room temperature recovery of cryogenically deformed aluminium alloyscitations
- 2020Evolution of microstructure and texture in laboratory- and industrial-scaled production of automotive Al-sheetscitations
- 2020Microstructural Change during the Interrupted Quenching of the AlZnMg(Cu) Alloy AA7050citations
- 2020Mg-alloys for forging applications-A reviewcitations
- 2020Mechanism of low temperature deformation in aluminium alloyscitations
- 2020Age-hardening response of AlMgZn alloys with Cu and Ag additionscitations
- 2019Size-dependent diffusion controls natural aging in aluminium alloyscitations
- 2019Age-hardening of high pressure die casting AlMg alloys with Zn and combined Zn and Cu additionscitations
- 2019Exceptional Strengthening of Biodegradable Mg-Zn-Ca Alloys through High Pressure Torsion and Subsequent Heat Treatmentcitations
- 2019Influence of Zn and Sn on the precipitation behavior of new Al-Mg-Si alloyscitations
- 2019Processing-controlled suppression of Lüders elongation in AlMgMn alloyscitations
- 2018Monotropic polymorphism in a glass-forming metallic alloycitations
- 2016Long-term in vivo degradation behavior and near-implant distribution of resorbed elements for magnesium alloys WZ21 and ZX50citations
- 2016Differential Scanning Calorimetry and Thermodynamic Predictions—A Comparative Study of Al-Zn-Mg-Cu Alloyscitations
- 2016Ultrafast artificial aging of Al-Mg-Si alloys
- 2015Thermodynamics of Pd-Mn phases and extension to the Fe-Mn-Pd systemcitations
- 2015Influence of temperature on natural aging kinetics of AA6061 modified with Sn
- 2015Influence of Alloy Production History on Natural Aging of AA6061 Modified with Sn
- 2015Processing and microstructure-property relations of high-strength low-alloy (HSLA) Mg-Zn-Ca alloyscitations
- 2013Influence of Microalloying Elements on the Negative Effect of Natural Pre-Aging on Artificial Aging in Al-Mg-Si Alloys
- 2011Experimental investigation and thermodynamic assessment of the Cu-Sn-Ti ternary systemcitations
- 2010The influence of heat treatment and plastic deformation on the bio-degradation of a Mg-Y-RE alloycitations
- 2010The influence of yttrium (Y) on the corrosion of Mg-Y binary alloyscitations
- 2009In situ microtomographically monitored and electrochemically controlled corrosion initiation and propagation in AlMgSi alloy AA6016citations
- 2009The influence of heat treatment and plastic deformation on the bio-degradation of a Mg-Y-RE alloycitations
- 2009Calculated phase diagrams and the corrosion of die-cast Mg-Al alloyscitations
- 2008In situ monitoring of corrosion processes within the bulk of AlMgSi alloys using X-ray microtomographycitations
- 2008Investigation of the exfoliation-like attack mechanism in relation to Al-Mg-Si alloy microstructurecitations
- 2008Calculated phase diagrams, iron tolerance limit, and corrosion of Mg-Al alloyscitations
- 2008Electrochemically controlled corrosion initiation and propagation in AlMgSi alloys in-situ monitored using X-ray microtomographycitations
- 2008Martensitic-austenitic 9-12% Cr steels-Alloy design, microstructural stability and mechanical propertiescitations
- 2008Corrosion behaviour of an Mg-Y-RE alloy used in biomedical applications studied by electrochemical techniquescitations
- 2008The influence of MgSi particle reactivity and dissolution processes on corrosion in Al-Mg-Si alloyscitations
- 2007Experimental investigation of the Cu-Ti-Zr system at 800 °Ccitations
- 2006Influence of composition and roughness on localized corrosion of Al-Mg-Si alloys characterized by microelectrochemistrycitations
- 2005Thermodynamic assessment of the Sn-Ti systemcitations
- 2005Local creep in SnAg3.8Cu0.7 lead-free soldercitations
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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.