A5062280781- Electronic Packaging and Soldering Technologies
- Aluminum Alloy Microstructure Properties
- Nuclear Physics and Applications
- Aluminum Alloys Composites Properties
- Microstructure and mechanical properties
- Metallurgy and Material Forming
- X-ray Diffraction in Crystallography
- Solidification and crystal growth phenomena
- Metallurgical and Alloy Processes
- Advanced X-ray and CT Imaging
- Microstructure and Mechanical Properties of Steels
- Metal and Thin Film Mechanics
- Copper Interconnects and Reliability
- Advanced Thermoelectric Materials and Devices
- Astro and Planetary Science
- Rock Mechanics and Modeling
- Additive Manufacturing Materials and Processes
- Geophysical Methods and Applications
- Welding Techniques and Residual Stresses
- Advanced X-ray Imaging Techniques
- Planetary Science and Exploration
- Seismic Imaging and Inversion Techniques
- Metal Alloys Wear and Properties
- Granular flow and fluidized beds
- Phase-change materials and chalcogenides
Malmö University
2022-2024
Lund University
2016-2022
Deutsches Elektronen-Synchrotron DESY
2019-2021
Helmholtz-Zentrum Hereon
2021
Institute of Solid Mechanics
2014-2018
RWTH Aachen University
2000
Two methods for reconstructing intragranular strain fields are developed scanning three-dimensional X-ray diffraction (3DXRD). The compared with a third approach where voxels reconstructed independently of their neighbours [Hayashi, Setoyama & Seno (2017). Mater. Sci. Forum , 905 157–164]. 3D field tin grain, located within sample approximately 70 grains, is analysed and across reconstruction methods. Implicit assumptions sub-problem independence, made in the independent voxel method,...
The 3D microstructure around a tin whisker, and its evolution during heat treatment were studied using scanning 3DXRD. shape of each grain in the sample was reconstructed filtered-back-projection algorithm. local lattice parameters orientations could then be refined, forward modelling diffraction data, with spatial resolution 250 n m . It found that coating had texture where grains oriented such their c-axes predominantly parallel to surface. Grains other consumed by growth treatment. Most...
Abstract 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 method (VIIM) can be used to simulate microstructure evolution polycrystals driven by diffusion. The key advantage of VIIM that single function utilized describe microstructure. Thus, computational cost significantly reduced compared more...
We have used Differential Aperture X-ray Microscopy (DAXM) to measure grain orientations and deviatoric elastic strains in 3D around a tin whisker. The results show strain gradients through the depth of coating, revealing higher deeper Sn layer. These are explained by volume change occurring during growth intermetallic phase Cu6Sn5 at interface between Cu substrate coating boundaries grains.
Abstract 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 brilliance and efficient large area detectors. Swedish Materials Science beamline at PETRA III dedicated characterization high-energy X-rays scheduled enter into user operation starting August 2019. designed in particular combination two...
Abstract The bone tissue formed at the contact interface with metallic implants, particularly its 3D microstructure, plays a pivotal role for structural integrity of implant fixation. X-ray tomography is classical imaging technique used accessing microstructural information from tissue. However, neutron has shown promise visualising immediate bone-metal interface, something which highly challenging x-rays due to large differences in attenuation between metal and biological causing image...
While the primary properties of thermoelectric devices, directly related to conversion efficiency, are considered in design efforts, secondary (thermomechanical) often ignored or overlooked even though they can lead failure. Here, thermomechanical ZrNiSn amorphous and crystalline state (space group F-43m), comprising thermal conductivity, expansion, elastic (Young's) modulus, shock, studied using density functional theory two phonon models. Thermal conductivity is also a key property for...
Scanning Laue microdiffraction was used to study the evolution of microstructure and stress field around two tin whiskers during ageing for up 21 months. In heterogeneous fields obtained, localised ridges high compressive leading root were found. Due intermetallic compound in interface between copper substrate coating, also evolving with time. The temporal indicates that regions supplying material whisker is changing time, highlighting growth a highly dynamical process. During experimental...
Abstract 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 combination of neutron and X‐ray tomography provides an important tool for characterization valuable samples. These allow quantitative analyses internal features also provide a guide further destructive with little no treatment, which maintains integrity, including minimizing risk...
Nakhlite meteorites are igneous rocks from Mars that were aqueously altered ~630 million years ago. Hydrothermal systems on Earth known to provide microhabitats; knowledge of the extent and duration these is crucial establish whether they could sustain life elsewhere in Solar System. Here, we explore three-dimensional distribution hydrous phases within Miller Range 03346 nakhlite meteorite using nondestructive neutron x-ray tomography determine alteration interconnected pervasive. The...
Braze clad on aluminum (Al) sheets has enabled fast and convenient brazing assembly of complex heat exchangers. However, there are details in the process that not fully understood. Herein, 3D X‐ray diffraction (3DXRD) is used to investigate grain position, size, orientation before after controlled atmosphere (CAB). The outcomes presented as maps center‐of‐mass positions with relative size distribution color‐coded orientations. results show that, for braze Al exposed CAB simulation, it...
The formation of stacking faults and dislocations in individual austenite (fcc) grains embedded a polycrystalline bulk Fe-18Cr-10.5Ni (wt.%) steel was investigated by non-destructive high-energy diffraction microscopy (HEDM) line profile analysis. broadening position intensity, diffracted from grains, were followed during situ tensile loading up to 0.09 strain. Furthermore, the predominant deformation mechanism as function grain orientation investigated, quantified. Grains oriented with...
A method for semantic segmentation of microstructure evolution from 4D imaging data is described and demonstrated. The based on a joint histogram describing the time history grayscale in each voxel images. After identifying labeling clusters histogram, labels are mapped back to image. results demonstrate accurate characterization sample evolution. advantages proposed include automatic many steps ability track over thereby discriminate similar different material phases. demonstrated through...
Abstract 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 high-temperature materials desired these applications suffer from poor bond strengths due to precipitation at line, preventing grain boundary migration. In this study, a diffusion stainless steel grade 321H is investigated, and mechanical properties found be caused by Ti(C, N) line....
The presence of residual stresses in produced parts is a well-recognizedphenomenon. These not only elevate the risk crack formation but also imposelimitations on in-service performance. Moreover, it can distort printed if released, or inthe worst case even cause build to fail due collision with powder scrape. This studyintroduces thermo-mechanical finite element model designed predict impact variousscanning strategies. investigation focuses deformation and oftwo geometries manufactured by...
In additive manufacturing, the presence of residual stresses in produced parts is a well-recognized phenomenon. These not only elevate risk crack formation but also impose limitations on in-service performance. Moreover, it can distort printed if released, or worst case even cause build to fail due collision with powder scraper. This study introduces thermo-mechanical finite element model designed predict impact various scanning strategies order mitigate aforementioned unwanted outcomes. The...