@inproceedings{36335,
  abstract     = {{Transformation of Fe- and Cu-rich primary phase particles was studied in an Al-Li-based alloy prepared by twin-roll casting. Thin foils for combined STEM and SEM experiments were prepared by electrolytic twin-jet polishing. They were in-situ heated in a TEM heating stage and observed at 200 kV in the JEOL JEM 2200FS electron microscope equipped with STEM HAADF and BF detectors and SEM BSE and SE detectors working both in composition and topographic modes. The resulting structures were combined with EDS mapping performed directly in the heating holder. Dissolution and transformation of Cu- and Fe-rich particles occur above 500 °C. EDS maps acquired on the foil cooled down to room temperature show that Cu and Fe are both still present in newly formed particles, most likely indicating the presence of the Al7Cu2Fe phase.}},
  author       = {{CIESLAR, Miroslav and KŘIVSKÁ, Barbora and KRÁLÍK, Rostislav and BAJTOŠOVÁ, Lucia and Grydin, Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko}},
  booktitle    = {{METAL 2022 Conference Proeedings}},
  issn         = {{2694-9296}},
  keywords     = {{Al-Li-based alloy, in-situ TEM, homogenization, phase transformation}},
  location     = {{Brno}},
  publisher    = {{TANGER Ltd.}},
  title        = {{{HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON MICROSCOPY}}},
  doi          = {{10.37904/metal.2022.4438}},
  year         = {{2022}},
}

@inproceedings{36339,
  abstract     = {{Al-Li-based alloys are an attractive material for aircraft and aerospace applications. Preparation of these alloys by twin-roll casting (TRC), which combines rapid metal solidification and subsequent plastic reduction in a single processing step, could improve the properties of the alloys compared to materials prepared by conventional direct-chill casting. A commonly used approach for identifying primary phases is a chemical analysis by energy dispersive spectroscopy (EDS). More accurate results can be achieved by combining the method with diffraction analysis. This process can be considerably simplified in microscopes equipped with automated crystal orientation and phase mapping (ACOM-TEM). Al-Cu-Li-Mg-Zr alloy was prepared by twin-roll casting. A combination of TEM and STEM images with chemical analysis by EDS and ACOM-TEM was used to obtain complex information about phases of boundary primary particles. The efficiency of the individual methods for the phase identification in TRC Al-Li-based alloys is discussed.}},
  author       = {{BAJTOŠOVÁ, Lucia and Grydin, Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko and KŘIVSKÁ, Barbora and KRÁLÍK, Rostislav and ŠLAPÁKOVÁ, Michaela and CIESLAR, Miroslav}},
  booktitle    = {{METAL 2022 Conference Proeedings}},
  issn         = {{2694-9296}},
  keywords     = {{Al-Cu-Li-M-Zr-Fe alloy, twin-roll casting, phase identification, ACOM-TEM}},
  location     = {{Brno}},
  publisher    = {{TANGER Ltd.}},
  title        = {{{Phase identification in twin-roll cast Al-Li alloys}}},
  doi          = {{10.37904/metal.2022.4437}},
  year         = {{2022}},
}

@article{62813,
  abstract     = {{Nanostructured manganese oxides have a rich variety of morphologies and crystal phases which can undergo transformations during synthesis and application. Although these structural features are crucial for their performance, the mechanisms behind such transitions are not well understood. Herein, we describe the mechanism of transformation from layered 2D δ-MnO2 nanosheets to the scarcely reported γ-MnO2 nanocone morphology. Despite the common purpose of introducing Fe dopants to enhance the conductivity of layered manganese oxides, the Fe galvanic exchange reaction was found responsible for such coupled phase/morphology transition. Electrochemical characterization confirmed a distinct electrochemical behaviour of the nanocones, emphasizing the need to unravel the mechanism of 2D MnO2 transformation. Such mechanistic insights were gained by systematic and rigorous electron microscopy studies. The effect of the local chemical composition was determined by energy dispersive X-ray spectroscopy while electron energy loss spectroscopy unravelled the key influence of the oxidation state of Mn ions within nanosheets and nanocones. We propose and demonstrate a Mn2+-mediated oxidative mechanism of coupled morphology/phase transformation subjected to the equilibrium of Fe and Mn ions during galvanic exchange reaction. These findings contribute to the understanding of the growth and morphology/phase transformations of manganese oxide nanostructures, providing insights for the rational design of nanomaterials.}},
  author       = {{Aymerich-Armengol, Raquel and Cignoni, Paolo and Ebbinghaus, Petra and Linnemann, Julia and Rabe, Martin and Tschulik, Kristina and Scheu, Christina and Lim, Joohyun}},
  issn         = {{2050-7488}},
  journal      = {{Journal of Materials Chemistry A}},
  keywords     = {{manganese oxide, nanomaterials, TEM, supercapacitors}},
  number       = {{45}},
  pages        = {{24190--24198}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Mechanism of coupled phase/morphology transformation of 2D manganese oxides through Fe galvanic exchange reaction}}},
  doi          = {{10.1039/d2ta06552e}},
  volume       = {{10}},
  year         = {{2022}},
}