% IMPORTANT: The following is UTF-8 encoded. This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.
@PHDTHESIS{Freund:999906,
author = {Freund, Martina Sophia Dominique},
othercontributors = {Korte-Kerzel, Sandra and Dehm, Gerhard},
title = {{D}islocations in complex intermetallic phases –
deformation mechanisms determination by nano-mechanical
testing},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2025-00002},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2024},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2025; Dissertation, Rheinisch-Westfälische
Technische Hochschule Aachen, 2024, Kumulative Dissertation},
abstract = {Laves phases represent a class of intermetallic compounds
with unique structures and properties. Exploring these
phases can lead to the discovery of novel materials with
desirable characteristics for various applications, such as
in the aerospace, automotive, and electronics industries.
Interesting are these for multi-component alloy systems like
the Mg-Al-Ca, to strengthen the main magnesium (Mg) matrix.
By studying their formation and properties, researchers can
optimise alloy compositions for specific purposes, such as
enhancing corrosion resistance, improving mechanical
properties, or reducing material costs. Especially to be
able to investigate this system and the interaction of the
main matrix with the Laves phases, the properties of Laves
phases must be unravelled to get more knowledge in terms of
plasticity and mechanical properties, to have further the
ability to understand the interaction. Investigating
different compositions of Laves phases contributes to our
understanding of phase stabilityand the influence of
chemistry on the mechanical properties. This knowledge is
crucial for predicting the behaviour of materials under
different conditions. The overarching goal of this thesis is
to get more insights into the dislocation behaviour of the
formed Laves phases of the Mg-Al-Ca system, namely the
hexagonal C14 CaMg2 and the cubic C15 CaAl2 Laves phase.
Therefore, this thesis was subdivided into sub-goals: i)
which slip systems can be activated, ii) the influence of
the temperature and the local chemistry on the dislocation
behaviour, and iii) the attempt to answer the question if
the findings of mechanical properties and dislocation
behaviour and their changes with temperature and local
chemistry can be transferred to similar stacked phases and
furthermore be generalisable for Laves phases at all. The
possible slip systems were analysed by a correlative
investigation of the surface traces around indentation
marks. Therefore, the grain orientations (using electron
backscatter diffraction(EBSD)) were taken and aligned with
secondary electron (SE) images of forming slip traces around
an indentation mark. Transmission electron microscopy (TEM)
analyses have identified new slip planes {112}, {113},
{114}, {115}, {116}, and {1 1 11}, summarized as the {11n}
planes, with a Burgers vector},
cin = {523110 / 520000},
ddc = {620},
cid = {$I:(DE-82)523110_20140620$ / $I:(DE-82)520000_20140620$},
pnm = {SFB 1394 A05 - Verallgemeinerte
Verformungsmechanismen-Karten und Wechselwirkung von
Versetzungsdefektphasen mit Leerstellen in Laves-Phasen
(A05) (437412665) / DFG project G:(GEPRIS)409476157 - SFB
1394: Strukturelle und chemische atomare Komplexität –
Von Defekt-Phasendiagrammen zu Materialeigenschaften
(409476157)},
pid = {G:(GEPRIS)437412665 / G:(GEPRIS)409476157},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2025-00002},
url = {https://publications.rwth-aachen.de/record/999906},
}
guest ::