| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Spieckermann, Florian
Montanuniversität Leoben
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (31/31 displayed)
- 2024Semi-analytical and experimental heat input study of additively manufactured Zr-based bulk metallic glasscitations
- 2024Controlling the Glassy State toward Structural and Mechanical Enhancement: Additive Manufacturing of Bulk Metallic Glass Using Advanced Laser Beam Shaping Technologycitations
- 2024Exploring Refinement Characteristics in FeTi‐Cu x Composites: A Study of Localization and Abrasion Constraintscitations
- 2024Mechanical processing and thermal stability of the equiatomic high entropy alloy TiVZrNbHf under vacuum and hydrogen pressurecitations
- 2023Rejuvenation engineering in metallic glasses by complementary stress and structure modulationcitations
- 2023Can Severe Plastic Deformation Tune Nanocrystallization in Fe-Based Metallic Glasses?citations
- 2023Hierarchical Surface Pattern on Ni-Free Ti-Based Bulk Metallic Glass to Control Cell Interactions.
- 2023From unlikely pairings to functional nanocomposites: FeTi–Cu as a model systemcitations
- 2023Toxic element-free Ti-based metallic glass ribbons with precious metal additionscitations
- 2023Controlling the Glassy State toward Structural and Mechanical Enhancement: Additive Manufacturing of Bulk Metallic Glass Using Advanced Laser Beam Shaping Technologycitations
- 2023Hierarchical Surface Pattern on Ni‐Free Ti‐Based Bulk Metallic Glass to Control Cell Interactionscitations
- 2023Short-range order patterns in Mg66Zn29Ca5 metallic glasscitations
- 2022Structure-dynamics relationships in cryogenically deformed bulk metallic glasscitations
- 2022Antibacterial activity, cytocompatibility, and thermomechanical stability of Ti40Zr10Cu36Pd14 bulk metallic glasscitations
- 2022New-generation biocompatible Ti-based metallic glass ribbons for flexible implantscitations
- 2022Magnetron Sputtered Non‐Toxic and Precious Element‐Free TiZrGe Metallic Glass Nanofilms with Enhanced Biocorrosion Resistancecitations
- 2022Maximizing the degree of rejuvenation in metallic glassescitations
- 2022Surmounting the thermal processing limitscitations
- 2021In Situ Synchrotron X‐Ray Diffraction during High‐Pressure Torsion Deformation of Ni and NiTicitations
- 2021Effect of high pressure torsion on crystallization and magnetic properties of Fe$_{73.9}$Cu$_{1}$Nb$_{3}$Si$_{15.5}$B$_{6.6}$citations
- 2021Morphology and properties of foamed high crystallinity PEEK prepared by high temperature thermally induced phase separationcitations
- 2021Transition metal-based high entropy alloy microfiber electrodescitations
- 2021Deformation-Mode-Sensitive Behavior of CuZr-Based Bulk Metallic Glasses Under Dynamic Loadingcitations
- 2021From elastic excitations to macroscopic plasticity in metallic glassescitations
- 2021Effect of high pressure torsion on crystallization and magnetic properties of Fe73.9Cu1Nb3Si15.5B6.6citations
- 2021Transition metal-based high entropy alloy microfiber electrodes: Corrosion behavior and hydrogen activitycitations
- 2020Room temperature recovery of cryogenically deformed aluminium alloyscitations
- 2020Mechanism of low temperature deformation in aluminium alloyscitations
- 2019Characterization of strain bursts in high density polyethylene by means of a novel nano creep testcitations
- 2017Atomic origin for rejuvenation of a Zr-based metallic glass at cryogenic temperaturecitations
- 2017Dislocation Movement Induced by Molecular Relaxations in Isotactic Polypropylenecitations
Places of action
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article
Dislocation Movement Induced by Molecular Relaxations in Isotactic Polypropylene
Abstract
The thermal stability of deformation-induced dislocations was investigated in polypropylene (PP) during annealing by means of in-situ X-ray diffraction using synchrotron radiation. The samples were cold rolled to high strains (ε = 1.2) in order to introduce a high number of dislocation lattice defects and immediately stored in liquid nitrogen afterward. Then, stepwise annealing was applied from −180 °C up to above the melting temperature (165 °C) while synchrotron X-ray diffraction patterns were recorded at each step. The resulting low noise, high angular resolution diffraction patterns were evaluated using multireflection X-ray profile analysis (MXPA), revealing parameters such as the dislocation density and the thickness of the crystalline lamellae as a function of the annealing temperature. Two significant decreases of the dislocation density were found at annealing temperatures of about 10 and 85 °C. These distinct changes in the dislocation density could be identified as the mechanisms of β- and α-relaxation, respectively, by performing additional dynamic mechanical thermal analysis (DMTA). This behavior could be attributed to an increased intrinsic mobility of the macromolecules at these temperatures accompanied by thermal activation of dislocations, resulting in their mutual annihilation or their movement into the adjacent amorphous phase. The reduction of the dislocation density at the glass transition (β-relaxation) occurs because the stabilizing effect of backstresses originating from the amorphous phase is lost. At the α-relaxation the reduction in the dislocation density is attributed to defect propagations within the crystalline lamellae as well as in the amorphous phase and the recrystallization of intralamellar mosaic blocks (i.e., grains).