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Helena Van Swygenhoven

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Publications associées (65)

Study of lattice strain evolution during biaxial deformation of stainless steel using a finite element and fast Fourier transform based multi-scale approach

Helena Van Swygenhoven, Steven Van Petegem

A multi-scale elastic-plastic finite element and fast Fourier transform based approach is proposed to study lattice strain evolution during uniaxial and biaxial loading of stainless steel cruciform shaped samples. At the macroscale, finite element simulati ...

Pergamon-Elsevier Science Ltd2016

Following dislocation patterning during fatigue

Helena Van Swygenhoven, Steven Van Petegem, Nicolò Grilli, Ainara Irastorza Landa

Precursors of failure are dislocation mechanisms at the nanoscale and dislocation organization at the mesoscale responsible for long-range internal stresses and lattice rotation. Detailed information on the link between both scales is missing, computationa ...

Elsevier2016

Grain size and alloying effects on dynamic recovery in nanocrystalline metals

Helena Van Swygenhoven, Steven Van Petegem

Dynamic recovery in nanocrystalline Ni and Ni50Fe50 with respective grain sizes of 65 rim and 15 nm is studied using stress reduction tests during in situ X-ray diffraction. The results are compared with a previous study on NC Ni with 35 nm grain size. Def ...

Pergamon-Elsevier Science Ltd2016

On the origin of cementite diffraction peak broadening during tensile deformation at ambient temperatures

Helena Van Swygenhoven, Michael Andreas Weisser, Steven Van Petegem

We report on the diffraction peak shape evolution from cementite particles in three steel microstructures, recorded during in-situ tensile deformation at room temperature. We demonstrate that in a bainitic tempered steel the observed peak broadening and as ...

Pergamon-Elsevier Science Ltd2015

Early cluster formation during rapid cooling of an Al-Cu-Mg alloy: In situ small-angle X-ray scattering

Jean-Marie Drezet, Helena Van Swygenhoven, Patrick Schloth

The formation of Cu-Mg clusters in an Al-Cu-Mg aluminum alloy is observed by small-angle X-ray scattering during cooling. Cooling rates are choosen to mimic the different conditions obtained at the surface and in the center of large forgings. Clusters of 0 ...

Elsevier2015

Early precipitation during cooling of an Al-Zn-Mg-Cu alloy revealed by in situ small angle X-ray scattering

Jean-Marie Drezet, Helena Van Swygenhoven, Patrick Schloth

Early subnanometre cluster formation during quenching of a high-strength AA7449 aluminium alloy was investigated using in situ small angle X-ray scattering. Fast quench cooling was obtained by using a laser-based heating system. The size and number density ...

American Institute of Physics2014

Origin of Anomalous Slip in Tungsten

Helena Van Swygenhoven, Cécile Renée Maria Marichal, Steven Van Petegem

Low-temperature deformation of body-centered cubic metals shows a significant amount of plastic slip on planes with low shear stresses, a phenomenon called anomalous slip. Despite progress in atomistic modeling of the consequences of complex stress states ...

American Physical Society2014

Microstructure and deformation mechanisms in nanocrystalline Ni-Fe. Part I. Microstructure

Helena Van Swygenhoven, Steven Van Petegem

We investigate various microstructural features of nanocrystalline electrodeposited Ni-Fe with a nominal iron content of 50% and compare them with the well-known nanocrystalline Ni system. In-depth electron microscopy analysis reveals the existence of larg ...

Pergamon-Elsevier Science Ltd2013

Microstructure and deformation mechanisms in nanocrystalline Ni-Fe. Part II. In situ testing during X-ray diffraction

Helena Van Swygenhoven, Steven Van Petegem

Deformation mechanisms in nanocrystalline electrodeposited Ni (26 nm) and Ni-Fe (12 nm) are studied by strain rate sensitivity experiments and in situ mechanical testing during X-ray diffraction. We find a relatively low strength for Ni-Fe, which may be as ...

Pergamon-Elsevier Science Ltd2013

Nanoprecipitates in single-crystal molybdenum-alloy nanopillars detected by TEM and atom probe tomography

Helena Van Swygenhoven, Cécile Hébert, Barbora Bártová, Emad Oveisi, Cécile Renée Maria Marichal

Transmission electron microscopy (TEM) supported by various chemical analyses techniques as well as atom probe tomography is applied to characterize newly identified nanosized precipitates in Mo-alloy nanopillars that were prepared by directional solidific ...

Elsevier2013

{110} Slip with {112} slip traces in bcc Tungsten

Helena Van Swygenhoven, Camelia Borca, Cécile Renée Maria Marichal, Steven Van Petegem

While propagation of dislocations in body centered cubic metals at low temperature is understood in terms of elementary steps on {110} planes, slip traces correspond often with other crystallographic or non-crystallographic planes. In the past, characteriz ...

Nature Publishing Group2013

INTERNAL STRESS GENERATION DURING QUENCHING OF THICK HEAT TREATABLE ALUMINIUM ALLOYS

Jean-Marie Drezet, Helena Van Swygenhoven, Nicolas Paul Henry Chobaut, Patrick Schloth

In the current trend toward thicker aluminium plates, a major concern is the stress build-up during quenching which causes distortions during machining. Indeed, cooling rates are not high enough, especially at the core of such thick plates, to prevent any ...

TMS2013

Combining neutron diffraction and imaging for residual strain measurements in a single crystal turbine blade

Helena Van Swygenhoven

Neutron diffraction is a technique often used for the non-destructive characterization of residual stresses in engineering materials and components. Measuring stresses within partially hollow objects with complex internal geometry however is challenging du ...

2012

Two strain-hardening mechanisms in nanocrystalline austenitic steel: An in situ synchrotron X-ray diffraction study

Helena Van Swygenhoven, Michael Andreas Weisser, Steven Van Petegem, Patrick Schloth

The mechanical behaviour of nanocrystalline austenitic steels with and without yttria particles was investigated using in situ synchrotron diffraction during tensile deformation. Two different strain-hardening regimes were found. The first regime can be as ...

2012

Band structure of gold from many-body perturbation theory

Helena Van Swygenhoven

The band structure of gold is calculated using ab initio many-body perturbation theory. Different approximations within the GW approach are considered. Standard single-shot G(0)W(0) corrections modify the sp-like bands while leaving unchanged the 5d occupi ...

American Physical Society2012

Slip in directionally solidified Mo-alloy micropillars-Part II: Pillars containing defects

Helena Van Swygenhoven, Camelia Borca, Steven Van Petegem

In situ Laue analysis during microcompression is carried out on Mo-alloy pillars containing defects due to focused ion beam milling or pre-strain. Independently of how the defects are introduced, if the diffraction peaks are streaked prior to deformation, ...

2012

Slip in directionally solidified Mo-alloy micropillars - Part I: Nominally dislocation-free pillars

Helena Van Swygenhoven, Camelia Borca, Cécile Hébert, Barbora Bártová, Emad Oveisi, Cécile Renée Maria Marichal, Steven Van Petegem

In situ Laue analysis during microcompression reveals plasticity in [0 0 1]-oriented, directionally solidified Mo alloy pillars to start with slip on the {1 1 2} < 1 1 1 > system having the highest Schmid factor followed by slip on the (1 1 0) plane contai ...

Elsevier2012

Helium-vacancy cluster in a single bcc iron crystal lattice

Helena Van Swygenhoven

The properties of the cluster HenV, an iron vacancy with an increasing number of He atoms, is studied with molecular statics and molecular dynamics simulations. A study of the binding energy of the self-interstitial atom (SIA) and the He, shows that from n ...

2011

In situ room temperature tensile deformation of a 1% CrMoV bainitic steel using synchrotron and neutron diffraction

Helena Van Swygenhoven, Michael Andreas Weisser, Steven Van Petegem

Neutron and synchrotron X-ray diffraction spectra have been acquired during room temperature tensile deformation of a creep-resistant bainitic 1% CrMoV steel, in order to study the evolution of internal microstresses and load-sharing mechanisms between the ...

2011

Coupled grain boundary motion in a nanocrystalline grain boundary network

Helena Van Swygenhoven

Coupled grain boundary motion was simulated in a three-dimensional nanocrystalline Al grain boundary network using molecular dynamics. It is shown that, in spite of the triple junction constraints, a symmetrical Sigma 75 tilt boundary can migrate during th ...

2011

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