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Introduction
In 2004 I
finished my Ph.D. in the
group of Microstructural Control of Metals
(MCM) at the University of Technology in
Delft, the Netherlands. This group performs
research on microstructural changes during
heat treatment and deformation of metals. In
addition to my experimental skills, I have
experience with sophisticated models of phase
transformations. During my Ph.D. I made
extensive contacts with various experts in
this field. I had close contacts with
external industrial researchers and closely
cooperate with various other academic groups
internally, such as the mathematical
department of the University of Delft. In the
past I graduated on Technical Physics at the
University of Technology of Eindhoven, The
Netherlands, in the group of Magnetism and
Nano Structures.
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My Ph.D. subject
The
kinetics of the b-AlFeSi to a-Al(FeMn)Si
transformation in Al-Mg-Si alloys.
Abstract:
During homogenisation of
Al-Mg-Si extrusion aluminium alloys,
plate-like metastable monoclinic b-AlFeSi
intermetallics transform to smaller and
rounded cubic a-Al(FeMn)Si
type of intermetallics. The a -particles
give better extrusion properties to the
aluminium as compared to the coarse b -particles,
and therefore the solid state b ŕ a
transformation process is favorable. To
analyse the nature of this phase
transformation, its process was investigated
by a number of different experimental
techniques including Optical Microscopy, SEM,
TEM, EDS and x-ray diffraction on extracted
particles. A Laser Scanning Confocal
Microscope (LSCM) was used to investigate
deep-etched samples and to localise the a -nuclei
on the b
-plates. Also computational 3D
reconstructions of series of 2D micrographs
were analysed to study the morphology changes
of the intermetallics during the
homogenisation. A Finite Element Model (FEM)
of the physical mechanism of the bŕa transformation
was made which describes the growth of a particles
on the b plates.
As a basis of this FEM model, thermodynamical
data were used, as extracted from a
thermodynamical data base (ThermoCalc). In
the model the influence of different
parameters on the homogenisation rate, such
as temperature, alloy content, and morphology
of the intermetallics, was successfully
implemented.
Download
complete thesis
Download Propositions (dutch
and englisch)
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| publications,
posters and reports:
some publications:
N.C.W. Kuijpers, F.J.
Vermolen, C. Vuik, P.T.G. Koenis, K.E. Nilsen, S van der
Zwaag. The dependence of the b-AlFeSi to
a-Al(FeMn)Si
transformation kinetics in Al-Mg-Si alloys on the alloying
elements. Mat. Sci. Eng. A 394 (2005) 9-19. download
N.C.W. Kuijpers, F.J.
Vermolen, K. Vuik, S van der Zwaag. A Model of the b-AlFeSi
to a-Al(FeMn)Si Transformation in Al-Mg-Si Alloys,
Mater.
Trans. 44 (2003) 1448-1456. download
N.C.W.
Kuijpers, J.Tirel, D.N. Hanlon, S. van der
Zwaag. Quantification of the evolution of the
3D intermetallic structure in a 6005A
aluminium alloy during a homogenisation
treatment, Mater. Char. 48 (2002) 379-392. (This article has been awarded
for the Buehler Merit Paper Award) download
J. van de
Langkruis, N.C.W. Kuijpers, W.H. Kool, F. J.
Vermolen, S van der Zwaag. Modelling Mg2Si
dissolution in an AA6063 alloy during
preheating to the extrusion temperature.
Conference: ET 2000: Seventh International
Aluminum Extrusion Technology Seminar. U.S.A,
Chicago, Aluminum Extruders Council,
vol 1, pp. 119-124. download
N.C.W.
Kuijpers, W.H. Kool and S. van der Zwaag. DSC
study on Mg-Si phases in as cast AA6xxx.
Mater. Sci. Forum 396-402 (2002) 675-680. download
some posters:
N.C.W.
Kuijpers, I. Todd, S. van der Zwaag. Phase
transformation of
beta-AlFeSi to
alpha-Al(FeMn)Si phases during homogenisation
of 6xxx Al alloys. PPM, Materials conference,
22-23 mei 2000, Veldhoven, The Netherlands. download
N.C.W.
Kuijpers, I.Todd, S. van der Zwaag. Phase
transformation of second phase intermetallics
in AA 6xxx during homogenization, NIMR
confernce, Noordwijkerhout, The Netherlands,
December 6 and 7, 1999. download
N.C.W.
Kuijpers, W. van Til, J. van de Langkruis, C.
Vuik, S. van der Zwaag. Modelling Mg2Si
Dissolution in 6063 Aluminium Alloy During
Preheating to the Extrusion Temperature,
FOM-meeting in Veldhoven, December 21 and 22,
1999. download
some reports:
N.C.W.
Kuijpers. Literature review: Intermetallic
phase transformations during homogenisation
of 6xxx Al alloys, a literature review.
Delft, Internal report NIMR, 2000. download
N.C.W.
Kuijpers. TU-graduation thesis at the group
of Physics of Nanostructures at the
University of Technology Eindhoven: Title:
Characterisation of nonmagnetic and
ferromagnetic tunnel junctions. download
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Contacts
Technical University of
Delft, the Netherlands
Microstructural Control
of Metals (My former research group)
Corus
BOAL Aluminium
Université catholique
de Louvain
Physics of
Nanostructures (Graduation Group at University
of Technology Eindhoven)
Bosch,
Van Doorne's Transmission B.V., Tilburg (Old employer)
MatInspired Innovative Analysis of Materials (My company)
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Last
modified: October 2009 by N.C.W. Kuijpers
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