---
_id: '36335'
abstract:
- lang: eng
text: 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:
- first_name: Miroslav
full_name: CIESLAR, Miroslav
last_name: CIESLAR
- first_name: Barbora
full_name: KŘIVSKÁ, Barbora
last_name: KŘIVSKÁ
- first_name: Rostislav
full_name: KRÁLÍK, Rostislav
last_name: KRÁLÍK
- first_name: Lucia
full_name: BAJTOŠOVÁ, Lucia
last_name: BAJTOŠOVÁ
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Mykhailo
full_name: STOLBCHENKO, Mykhailo
last_name: STOLBCHENKO
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: 'CIESLAR M, KŘIVSKÁ B, KRÁLÍK R, et al. HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED
ALLOY STUDIED BY IN-SITU ELECTRON MICROSCOPY. In: METAL 2022 Conference Proeedings.
TANGER Ltd.; 2022. doi:10.37904/metal.2022.4438'
apa: CIESLAR, M., KŘIVSKÁ, B., KRÁLÍK, R., BAJTOŠOVÁ, L., Grydin, O., STOLBCHENKO,
M., & Schaper, M. (2022). HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY
STUDIED BY IN-SITU ELECTRON MICROSCOPY. METAL 2022 Conference Proeedings.
Metal 2022, Brno. https://doi.org/10.37904/metal.2022.4438
bibtex: '@inproceedings{CIESLAR_KŘIVSKÁ_KRÁLÍK_BAJTOŠOVÁ_Grydin_STOLBCHENKO_Schaper_2022,
title={HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON
MICROSCOPY}, DOI={10.37904/metal.2022.4438},
booktitle={METAL 2022 Conference Proeedings}, publisher={TANGER Ltd.}, author={CIESLAR,
Miroslav and KŘIVSKÁ, Barbora and KRÁLÍK, Rostislav and BAJTOŠOVÁ, Lucia and Grydin,
Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko}, year={2022} }'
chicago: CIESLAR, Miroslav, Barbora KŘIVSKÁ, Rostislav KRÁLÍK, Lucia BAJTOŠOVÁ,
Olexandr Grydin, Mykhailo STOLBCHENKO, and Mirko Schaper. “HOMOGENIZATION OF TWIN-ROLL
CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON MICROSCOPY.” In METAL 2022
Conference Proeedings. TANGER Ltd., 2022. https://doi.org/10.37904/metal.2022.4438.
ieee: 'M. CIESLAR et al., “HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY
STUDIED BY IN-SITU ELECTRON MICROSCOPY,” presented at the Metal 2022, Brno, 2022,
doi: 10.37904/metal.2022.4438.'
mla: CIESLAR, Miroslav, et al. “HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY
STUDIED BY IN-SITU ELECTRON MICROSCOPY.” METAL 2022 Conference Proeedings,
TANGER Ltd., 2022, doi:10.37904/metal.2022.4438.
short: 'M. CIESLAR, B. KŘIVSKÁ, R. KRÁLÍK, L. BAJTOŠOVÁ, O. Grydin, M. STOLBCHENKO,
M. Schaper, in: METAL 2022 Conference Proeedings, TANGER Ltd., 2022.'
conference:
end_date: 2022-05-19
location: Brno
name: Metal 2022
start_date: 2022-05-18
date_created: 2023-01-12T09:39:41Z
date_updated: 2023-01-12T09:44:17Z
department:
- _id: '158'
- _id: '321'
doi: 10.37904/metal.2022.4438
keyword:
- Al-Li-based alloy
- in-situ TEM
- homogenization
- phase transformation
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.confer.cz/metal/2022/4438-homogenization-of-twin-roll-cast-al-li-based-alloy-studied-by-in-situ-electron-microscopy
oa: '1'
publication: METAL 2022 Conference Proeedings
publication_identifier:
issn:
- 2694-9296
publication_status: published
publisher: TANGER Ltd.
status: public
title: HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON
MICROSCOPY
type: conference
user_id: '43822'
year: '2022'
...
---
_id: '36339'
abstract:
- lang: eng
text: 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:
- first_name: Lucia
full_name: BAJTOŠOVÁ, Lucia
last_name: BAJTOŠOVÁ
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Mykhailo
full_name: STOLBCHENKO, Mykhailo
last_name: STOLBCHENKO
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
- first_name: Barbora
full_name: KŘIVSKÁ, Barbora
last_name: KŘIVSKÁ
- first_name: Rostislav
full_name: KRÁLÍK, Rostislav
last_name: KRÁLÍK
- first_name: Michaela
full_name: ŠLAPÁKOVÁ, Michaela
last_name: ŠLAPÁKOVÁ
- first_name: Miroslav
full_name: CIESLAR, Miroslav
last_name: CIESLAR
citation:
ama: 'BAJTOŠOVÁ L, Grydin O, STOLBCHENKO M, et al. Phase identification in twin-roll
cast Al-Li alloys. In: METAL 2022 Conference Proeedings. TANGER Ltd.; 2022.
doi:10.37904/metal.2022.4437'
apa: BAJTOŠOVÁ, L., Grydin, O., STOLBCHENKO, M., Schaper, M., KŘIVSKÁ, B., KRÁLÍK,
R., ŠLAPÁKOVÁ, M., & CIESLAR, M. (2022). Phase identification in twin-roll
cast Al-Li alloys. METAL 2022 Conference Proeedings. Metal 2022, Brno.
https://doi.org/10.37904/metal.2022.4437
bibtex: '@inproceedings{BAJTOŠOVÁ_Grydin_STOLBCHENKO_Schaper_KŘIVSKÁ_KRÁLÍK_ŠLAPÁKOVÁ_CIESLAR_2022,
title={Phase identification in twin-roll cast Al-Li alloys}, DOI={10.37904/metal.2022.4437},
booktitle={METAL 2022 Conference Proeedings}, publisher={TANGER Ltd.}, author={BAJTOŠOVÁ,
Lucia and Grydin, Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko and KŘIVSKÁ,
Barbora and KRÁLÍK, Rostislav and ŠLAPÁKOVÁ, Michaela and CIESLAR, Miroslav},
year={2022} }'
chicago: BAJTOŠOVÁ, Lucia, Olexandr Grydin, Mykhailo STOLBCHENKO, Mirko Schaper,
Barbora KŘIVSKÁ, Rostislav KRÁLÍK, Michaela ŠLAPÁKOVÁ, and Miroslav CIESLAR. “Phase
Identification in Twin-Roll Cast Al-Li Alloys.” In METAL 2022 Conference Proeedings.
TANGER Ltd., 2022. https://doi.org/10.37904/metal.2022.4437.
ieee: 'L. BAJTOŠOVÁ et al., “Phase identification in twin-roll cast Al-Li
alloys,” presented at the Metal 2022, Brno, 2022, doi: 10.37904/metal.2022.4437.'
mla: BAJTOŠOVÁ, Lucia, et al. “Phase Identification in Twin-Roll Cast Al-Li Alloys.”
METAL 2022 Conference Proeedings, TANGER Ltd., 2022, doi:10.37904/metal.2022.4437.
short: 'L. BAJTOŠOVÁ, O. Grydin, M. STOLBCHENKO, M. Schaper, B. KŘIVSKÁ, R. KRÁLÍK,
M. ŠLAPÁKOVÁ, M. CIESLAR, in: METAL 2022 Conference Proeedings, TANGER Ltd., 2022.'
conference:
end_date: 2022-05-19
location: Brno
name: Metal 2022
start_date: 2022-05-18
date_created: 2023-01-12T09:42:02Z
date_updated: 2023-04-27T16:35:42Z
department:
- _id: '158'
- _id: '321'
doi: 10.37904/metal.2022.4437
keyword:
- Al-Cu-Li-M-Zr-Fe alloy
- twin-roll casting
- phase identification
- ACOM-TEM
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.confer.cz/metal/2022/4437-phase-identification-in-twin-roll-cast-al-li-alloys
oa: '1'
publication: METAL 2022 Conference Proeedings
publication_identifier:
issn:
- 2694-9296
publication_status: published
publisher: TANGER Ltd.
quality_controlled: '1'
status: public
title: Phase identification in twin-roll cast Al-Li alloys
type: conference
user_id: '43720'
year: '2022'
...
---
_id: '62813'
abstract:
- lang: eng
text: 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.
article_type: original
author:
- first_name: Raquel
full_name: Aymerich-Armengol, Raquel
last_name: Aymerich-Armengol
- first_name: Paolo
full_name: Cignoni, Paolo
last_name: Cignoni
- first_name: Petra
full_name: Ebbinghaus, Petra
last_name: Ebbinghaus
- first_name: Julia
full_name: Linnemann, Julia
id: '116779'
last_name: Linnemann
orcid: 0000-0001-6883-5424
- first_name: Martin
full_name: Rabe, Martin
last_name: Rabe
- first_name: Kristina
full_name: Tschulik, Kristina
last_name: Tschulik
- first_name: Christina
full_name: Scheu, Christina
last_name: Scheu
- first_name: Joohyun
full_name: Lim, Joohyun
last_name: Lim
citation:
ama: Aymerich-Armengol R, Cignoni P, Ebbinghaus P, et al. Mechanism of coupled phase/morphology
transformation of 2D manganese oxides through Fe galvanic exchange reaction. Journal
of Materials Chemistry A. 2022;10(45):24190-24198. doi:10.1039/d2ta06552e
apa: Aymerich-Armengol, R., Cignoni, P., Ebbinghaus, P., Linnemann, J., Rabe, M.,
Tschulik, K., Scheu, C., & Lim, J. (2022). Mechanism of coupled phase/morphology
transformation of 2D manganese oxides through Fe galvanic exchange reaction. Journal
of Materials Chemistry A, 10(45), 24190–24198. https://doi.org/10.1039/d2ta06552e
bibtex: '@article{Aymerich-Armengol_Cignoni_Ebbinghaus_Linnemann_Rabe_Tschulik_Scheu_Lim_2022,
title={Mechanism of coupled phase/morphology transformation of 2D manganese oxides
through Fe galvanic exchange reaction}, volume={10}, DOI={10.1039/d2ta06552e},
number={45}, journal={Journal of Materials Chemistry A}, publisher={Royal Society
of Chemistry (RSC)}, 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}, year={2022}, pages={24190–24198} }'
chicago: 'Aymerich-Armengol, Raquel, Paolo Cignoni, Petra Ebbinghaus, Julia Linnemann,
Martin Rabe, Kristina Tschulik, Christina Scheu, and Joohyun Lim. “Mechanism of
Coupled Phase/Morphology Transformation of 2D Manganese Oxides through Fe Galvanic
Exchange Reaction.” Journal of Materials Chemistry A 10, no. 45 (2022):
24190–98. https://doi.org/10.1039/d2ta06552e.'
ieee: 'R. Aymerich-Armengol et al., “Mechanism of coupled phase/morphology
transformation of 2D manganese oxides through Fe galvanic exchange reaction,”
Journal of Materials Chemistry A, vol. 10, no. 45, pp. 24190–24198, 2022,
doi: 10.1039/d2ta06552e.'
mla: Aymerich-Armengol, Raquel, et al. “Mechanism of Coupled Phase/Morphology Transformation
of 2D Manganese Oxides through Fe Galvanic Exchange Reaction.” Journal of Materials
Chemistry A, vol. 10, no. 45, Royal Society of Chemistry (RSC), 2022, pp.
24190–98, doi:10.1039/d2ta06552e.
short: R. Aymerich-Armengol, P. Cignoni, P. Ebbinghaus, J. Linnemann, M. Rabe, K.
Tschulik, C. Scheu, J. Lim, Journal of Materials Chemistry A 10 (2022) 24190–24198.
date_created: 2025-12-03T16:02:15Z
date_updated: 2025-12-03T16:30:43Z
department:
- _id: '985'
doi: 10.1039/d2ta06552e
extern: '1'
intvolume: ' 10'
issue: '45'
keyword:
- manganese oxide
- nanomaterials
- TEM
- supercapacitors
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
page: 24190-24198
publication: Journal of Materials Chemistry A
publication_identifier:
issn:
- 2050-7488
- 2050-7496
publication_status: published
publisher: Royal Society of Chemistry (RSC)
quality_controlled: '1'
status: public
title: Mechanism of coupled phase/morphology transformation of 2D manganese oxides
through Fe galvanic exchange reaction
type: journal_article
user_id: '116779'
volume: 10
year: '2022'
...