Johan Hektor
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View article: The effect of stress on thermoelectric properties of flexible Mg3Bi2 thin films
The effect of stress on thermoelectric properties of flexible Mg3Bi2 thin films Open
Mechanically flexible thermoelectric materials are of importance for energy harvesting and powering portable and wearable devices. Stress is often disregarded in investigations of thermoelectric properties, despite the fact that it is incr…
View article: Corrigendum to “Amorphous TiNiSn thin films for mechanical flexibility in thermoelectric applications” [Thin Solid Films 807 (2024) 140534]
Corrigendum to “Amorphous TiNiSn thin films for mechanical flexibility in thermoelectric applications” [Thin Solid Films 807 (2024) 140534] Open
View article: Combined in situ X-ray diffraction and tomography study on the evolution of the microstructure in 316L stainless steel foams during compression
Combined in situ X-ray diffraction and tomography study on the evolution of the microstructure in 316L stainless steel foams during compression Open
View article: Modelling diffusive phase transformations in multiphase systems using the Voronoi implicit interface method
Modelling diffusive phase transformations in multiphase systems using the Voronoi implicit interface method Open
This paper presents a general level set framework for modelling diffusive solid-state phase transformation processes in binary systems comprising several grains and phases. Notably, it is demonstrated how the Voronoi implicit interface met…
View article: Surface grain orientation mapping using grazing incidence X-ray diffraction
Surface grain orientation mapping using grazing incidence X-ray diffraction Open
View article: Influence of Scanning Strategy on Residual Stresses in Laser-Based Powder Bed Fusion Manufactured Alloy 718: Modeling and Experiments
Influence of Scanning Strategy on Residual Stresses in Laser-Based Powder Bed Fusion Manufactured Alloy 718: Modeling and Experiments Open
In additive manufacturing, the presence of residual stresses in produced parts is a well-recognized phenomenon. These residual stresses not only elevate the risk of crack formation but also impose limitations on in-service performance. Mor…
View article: Amorphous TiNiSn thin films for mechanical flexibility in thermoelectric applications
Amorphous TiNiSn thin films for mechanical flexibility in thermoelectric applications Open
View article: A level set approach to modelling diffusional phase transformations under finite strains with application to the formation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si393.svg" display="inline" id="d1e1166"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Sn</mml:mtext></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
A level set approach to modelling diffusional phase transformations under finite strains with application to the formation of Open
View article: Diffusion Bonding 321-Grade Stainless Steel: Failure and Multimodal Characterization
Diffusion Bonding 321-Grade Stainless Steel: Failure and Multimodal Characterization Open
Vacuum diffusion-bonded printed circuit heat exchangers are an attractive choice for the high-temperature, high-pressure demands of next-generation energy applications. However, early reports show that the high-temperature materials desire…
View article: Combined Neutron and X‐Ray Tomography—A Versatile and Non‐Destructive Tool in Planetary Geosciences
Combined Neutron and X‐Ray Tomography—A Versatile and Non‐Destructive Tool in Planetary Geosciences Open
With several upcoming sample return missions, such as the Mars Sample Return Campaign, non‐destructive methods will be key to maximizing their scientific output. In this study, we demonstrate that the combination of neutron and X‐ray tomog…
View article: Influence of Scanning Strategy on Residual Stresses in Laser-Based Powder Bed Fusion Manufactured Alloy 718: Modeling and Experiments
Influence of Scanning Strategy on Residual Stresses in Laser-Based Powder Bed Fusion Manufactured Alloy 718: Modeling and Experiments Open
View article: evoSegment: 4D image segmentation of microstructural evolution using joint histograms
evoSegment: 4D image segmentation of microstructural evolution using joint histograms Open
A method for semantic segmentation of microstructure evolution from 4D imaging data is described and demonstrated. The method is based on a joint histogram describing the time history of the grayscale in each voxel of the images. After ide…
View article: Combined neutron and X-ray tomography – A versatile and non-destructive tool in planetary geosciences
Combined neutron and X-ray tomography – A versatile and non-destructive tool in planetary geosciences Open
Neutron data acquired at: Luizi: Institut Laue-Langevin (NeXT) Libyan Desert Glass: Paul Scherrer Institut (ICON) Chicxulub core sample: Institut Laue-Langevin (NeXT) All X-ray data acquired at the 4D Imaging, Lab Lund University, Sweden
View article: Conflicting primary and secondary properties of thermoelectric devices – A case study on the thermomechanical behavior of ZrNiSn
Conflicting primary and secondary properties of thermoelectric devices – A case study on the thermomechanical behavior of ZrNiSn Open
While the primary properties of thermoelectric devices, directly related to the conversion efficiency, are considered in design efforts, the secondary (thermomechanical) properties are often ignored or overlooked even though they can lead …
View article: Crystal structure informed mesoscale deformation model for HCP Cu<sub>6</sub>Sn<sub>5</sub> intermetallic compound
Crystal structure informed mesoscale deformation model for HCP Cu<sub>6</sub>Sn<sub>5</sub> intermetallic compound Open
In the electronic packaging and energy storage sectors, the study of Cu6Sn5\nintermetallic compound (IMC) is getting more attention. At temperatures above\n186 oC, this IMC exists in a hexagonal closed packed (HCP) crystalline\nstructure. …
View article: The scale of a martian hydrothermal system explored using combined neutron and x-ray tomography
The scale of a martian hydrothermal system explored using combined neutron and x-ray tomography Open
Nakhlite meteorites are igneous rocks from Mars that were aqueously altered ~630 million years ago. Hydrothermal systems on Earth are known to provide microhabitats; knowledge of the extent and duration of these systems is crucial to estab…
View article: Formation of Dislocations and Stacking Faults in Embedded Individual Grains during In Situ Tensile Loading of an Austenitic Stainless Steel
Formation of Dislocations and Stacking Faults in Embedded Individual Grains during In Situ Tensile Loading of an Austenitic Stainless Steel Open
The formation of stacking faults and dislocations in individual austenite (fcc) grains embedded in a polycrystalline bulk Fe-18Cr-10.5Ni (wt.%) steel was investigated by non-destructive high-energy diffraction microscopy (HEDM) and line pr…
View article: 3D X‐Ray Diffraction Characterization of Grain Growth and Recrystallization in Rolled Braze Clad Aluminum Sheet
3D X‐Ray Diffraction Characterization of Grain Growth and Recrystallization in Rolled Braze Clad Aluminum Sheet Open
Braze clad on aluminum (Al) sheets has enabled fast and convenient brazing assembly of complex heat exchangers. However, there are details in the brazing process that are not fully understood. Herein, 3D X‐ray diffraction (3DXRD) is used t…
View article: Dual modality neutron and x-ray tomography for enhanced image analysis of the bone-metal interface
Dual modality neutron and x-ray tomography for enhanced image analysis of the bone-metal interface Open
The bone tissue formed at the contact interface with metallic implants, particularly its 3D microstructure, plays a pivotal role for the structural integrity of implant fixation. X-ray tomography is the classical imaging technique used for…
View article: Integration of machine learning with phase field method to model the electromigration induced Cu6Sn5 IMC growth at anode side Cu/Sn interface
Integration of machine learning with phase field method to model the electromigration induced Cu6Sn5 IMC growth at anode side Cu/Sn interface Open
View article: Combining multi-phase field simulation with neural network analysis to unravel thermomigration accelerated growth behavior of Cu6Sn5 IMC at cold side Cu–Sn interface
Combining multi-phase field simulation with neural network analysis to unravel thermomigration accelerated growth behavior of Cu6Sn5 IMC at cold side Cu–Sn interface Open
View article: Reconstructing intragranular strain fields in polycrystalline materials from scanning 3DXRD data
Reconstructing intragranular strain fields in polycrystalline materials from scanning 3DXRD data Open
Two methods for reconstructing intragranular strain fields are developed for scanning three-dimensional X-ray diffraction (3DXRD). The methods are compared with a third approach where voxels are reconstructed independently of their neighbo…
View article: Imaging modalities at the Swedish Materials Science beamline at PETRA III
Imaging modalities at the Swedish Materials Science beamline at PETRA III Open
High-energy synchrotron radiation has been demonstrated to be a powerful tool for materials characterization. The development of novel methodologies is still ongoing, driven by major technological advances regarding the available source br…
View article: Long term evolution of microstructure and stress around tin whiskers investigated using scanning Laue microdiffraction
Long term evolution of microstructure and stress around tin whiskers investigated using scanning Laue microdiffraction Open
Scanning Laue microdiffraction was used to study the evolution of the microstructure and the stress field around two tin whiskers during ageing for up to 21 months. In the heterogeneous stress fields obtained, localised ridges of high comp…
View article: Scanning 3DXRD Measurement of Grain Growth, Stress, and Formation of Cu6Sn5 around a Tin Whisker during Heat Treatment
Scanning 3DXRD Measurement of Grain Growth, Stress, and Formation of Cu6Sn5 around a Tin Whisker during Heat Treatment Open
The 3D microstructure around a tin whisker, and its evolution during heat treatment were studied using scanning 3DXRD. The shape of each grain in the sample was reconstructed using a filtered-back-projection algorithm. The local lattice pa…
View article: Tin whiskers: experiments and modelling
Tin whiskers: experiments and modelling Open
Tin whiskers are hair-like single crystals that spontaneously grow from tin-coated surfaces. Whiskers are commonly found in electronic components, where tin coatings are used in, e.g., soldering applications, and to protect components from…
View article: Evidence of 3D strain gradients associated with tin whisker growth
Evidence of 3D strain gradients associated with tin whisker growth Open
View article: Full-Field Grain-Strain Mapping of Sand Using Neutrons
Full-Field Grain-Strain Mapping of Sand Using Neutrons Open
View article: In-situ Grain-strain Mapping of Quartz Sand Using Neutron Diffraction Scanning
In-situ Grain-strain Mapping of Quartz Sand Using Neutron Diffraction Scanning Open
View article: A Diffusion-Deformation Multiphase Field Model for Elastoplastic Materials Applied to the Growth of Cu6Sn5
A Diffusion-Deformation Multiphase Field Model for Elastoplastic Materials Applied to the Growth of Cu6Sn5 Open