Tijmen Vermeij

Tijmen Vermeij
Empa - Swiss Federal Laboratories for Materials Science and Technology | Empa · Laboratory for Mechanics of Materials and Nanostructures

PhD

About

37
Publications
19,259
Reads
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347
Citations
Introduction
Tijmen Vermeij recently obtained his PhD at the Mechanics of Materials group at TU/e. His PhD project, supervised by Johan Hoefnagels, focused on experimental investigations of micromechanical deformation and damage mechanisms in Dual-Phase Steels. This research was primarily conducted by developing and combining advanced microscopy techniques, such as SEM-DIC and HR-EBSD, on micromechanical deformation tests, through which the full chain of deformation and damage events was tracked.
Additional affiliations
September 2018 - present
Eindhoven University of Technology
Position
  • PhD Student
Description
  • Doctoral Candidate in the Mechanics of Materials group, investigating damage in Dual-Phase Steels
Education
September 2012 - May 2018
Eindhoven University of Technology
Field of study
  • Mechanical Engineering

Publications

Publications (37)
Article
Full-text available
Crystallographic slip system identification methods are widely employed to characterize the fine scale deformation of metals. While powerful, they usually rely on the occurrence of discrete slip bands with clear slip traces and can struggle when complex mechanisms such as cross-slip, curved slip, diffuse slip and/or intersecting slip occur. This pa...
Article
Full-text available
Martensite damage in Dual-Phase (DP) steel has been studied extensively, yet, the exact deformation mechanisms that trigger or inhibit damage initiation remain mostly unexplored. Whereas generally assumed to be hard and brittle, lath martensite in fact deforms in a highly anisotropic manner, showing large strains under favorable habit plane orienta...
Article
Full-text available
Integrated experimental-numerical testing on bulk metal alloys with fine, complex microstructures is known to be highly challenging, since measurements are restricted to the sample surface, thereby failing to capture the effects of the 3D subsurface microstructure. Consequently, a quantitative comparison of deformation fields between experiments an...
Preprint
Full-text available
Identification of crystallographic slip in metals and alloys is crucial to understand and improve their mechanical behavior. Recently, a novel slip system identification framework, termed SSLIP (for Slip System-based Local Identification of Plasticity), was introduced to leap from conventional trace-based identification to automated, point-by-point...
Preprint
Full-text available
We present a novel methodology for in-situ Transmission Kikuchi Diffraction (TKD) nano-tensile testing that enables nanoscale characterization of the evolution of complex plasticity mechanisms. By integrating a modified in-situ Scanning Electron Microscope (SEM) nanoindenter with a microscale push-to-pull device and a conventional Electron Backscat...
Article
Full-text available
Large-scale synthesis of high-purity nanoparticles is an intense topic of scientific research, with magnetron sputter inert gas condensation recognized as a promising, environmentally friendly technique avoiding wet chemical processes. This study explores the deposition of size-selected nanoparticles under varied substrate bias voltages and reports...
Article
Full-text available
Quantization effects in nanolaminate structures of oxide materials are proposed and experimentally demonstrated only recently. Herein, the material combination of amorphous silicon and SiO2 deposited by magnetron sputtering is investigated and it is shown that the quantization effect can be observed indeed. Transmission electron microscopy characte...
Article
Full-text available
Martensite/ferrite (M/F) interface damage is relevant to failure of many dual-phase (DP) steels, but the underlying microscale mechanisms remain unclear. Through an integrated experimental-numerical study, this work examines the recent hypothesis that (lath) martensite substructure boundary sliding triggers and dominates M/F interface damage initia...
Preprint
Full-text available
This work presents a detailed experimental-numerical analysis of a low-carbon dual-phase steel microstructure, revealing evidence of significant anisotropic plastic deformation in lath martensite. A careful determination of the habit plane orientations in the present martensitic variants demonstrates that the observed traces of plastic slip coincid...
Preprint
Full-text available
Martensite damage in Dual-Phase (DP) steel has been studied extensively, yet, the exact deformation mechanisms that trigger or inhibit damage initiation remain mostly unexplored. Whereas generally assumed to be hard and brittle, lath martensite in fact deforms in a highly anisotropic manner, showing large strains under favorable habit plane orienta...
Article
Full-text available
Background The continuous development of new multiphase alloys with improved mechanical properties requires quantitative microstructure-resolved observation of the nanoscale deformation mechanisms at, e.g., multiphase interfaces. This calls for a combinatory approach beyond advanced testing methods such as microscale strain mapping on bulk material...
Preprint
Full-text available
Crystallographic slip system identification methods are widely employed to characterize the fine scale deformation of metals. While powerful, they usually rely on the occurrence of discrete slip bands with clear slip traces and can struggle when complex mechanisms such as cross-slip, curved slip, diffuse slip and/or intersecting slip occur. This pa...
Article
Tungsten is the leading plasma-facing material (PFM) for nuclear fusion applications. It faces severe operating conditions, including intense hydrogen plasma exposure and high-cycle transient heat loading, which create various defects in tungsten. Additionally, defects have often already been introduced during manufacturing. Little is understood re...
Article
Full-text available
The evolution of deformation from plasticity to localization to damage is investigated in ferritic-pearlitic steel through nanometer-resolution microstructure-correlated SEM-DIC (µ-DIC) strain mapping, enabled through highly accurate microstructure-to-strain alignment. We reveal the key plasticity mechanisms in ferrite and pearlite as well as their...
Preprint
Full-text available
The continuous development of new multiphase alloys with improved mechanical properties requires quantitative microstructure-resolved observation of the nanoscale deformation mechanisms at, e.g., multiphase interfaces. This calls for a combinatory approach beyond advanced testing methods such as microscale strain mapping on bulk material and microm...
Preprint
Full-text available
The evolution of deformation from plasticity to localization to damage is investigated in ferritic-pearlitic steel through nanometer-resolution microstructure-correlated SEM-DIC strain mapping, enabled through highly accurate microstructure-to-strain alignment. We reveal the key plasticity mechanisms in ferrite and pearlite as well as their evoluti...
Article
Tungsten and tungsten-based alloys are the leading material choices for the divertor plasma facing components (PFCs) in future fusion reactors. Recrystallization may occur when they undergo high heat loads, drastically modifying the predesigned grain structures and the associated desired mechanical properties. However, the influence of recrystalliz...
Article
Full-text available
Martensite/ferrite (M/F) interface damage plays a critical role in controlling failure of dual-phase (DP) steels and is commonly understood to originate from the large phase contrast between martensite and ferrite. This however conflicts with a few, recent observations, showing that considerable M/F interface damage initiation is often accompanied...
Article
Full-text available
Digital image correlation (DIC) is of vital importance in the field of experimental mechanics, yet producing suitable DIC patterns for demanding in-situ (micro) mechanical tests remains challenging, especially for ultrafine patterns, despite the large number of patterning techniques reported in the literature. Therefore, we propose a simple, flexib...
Article
Avoiding FIB damage using the “umbrella” method - Volume 25 Supplement - C.C. Tasan, T. Vermeij, E. Plancher
Preprint
Full-text available
Digital Image Correlation (DIC) is of vital importance in the field of experimental mechanics, yet, producing suitable DIC patterns for demanding in-situ mechanical tests remains challenging, especially for ultra-fine patterns, despite the large number of patterning techniques in the literature. Therefore, we propose a simple, flexible, one-step te...
Article
Full-text available
We report a first exploration of High-angular-Resolution Electron Backscatter Diffraction, without using simulated Electron Backscatter Diffraction patterns as a reference, for absolute stress and orientation measurements in polycrystalline materials. By co-correlating the pattern center and fully exploiting crystal symmetry and plane-stress, simul...
Preprint
Full-text available
We report the first use of High-angular-Resolution Electron Backscatter Diffraction, without using simulated electron diffraction patterns as a reference, for absolute stress and orientation measurements in polycrystalline materials. By co-correlating the pattern center and fully exploiting crystal symmetry and plane-stress, simultaneous correlatio...
Article
Full-text available
A general, transparent, finite-strain Integrated Digital Image Correlation (IDIC) framework for high angular resolution EBSD (HR-EBSD) is proposed, and implemented through a rigorous derivation of the optimization scheme starting from the fundamental brightness conservation equation in combination with a clear geometric model of the Electron BackSc...
Article
Full-text available
Metal-elastomer interfacial systems, often encountered in stretchable electronics, demonstrate remarkably high interface fracture toughness values. Evidently, a large gap exists between the rather small adhesion energy levels at the microscopic scale ('intrinsic adhesion') and the large measured macroscopic work-of-separation. This energy gap is cl...
Article
Focused ion beam (FIB) milling has enabled the development of key microstructure characterization techniques (e.g. 3D electron backscatter diffraction (EBSD), 3D scanning electron microscopy imaging, site- specific sample preparation for transmission electron microscopy, site-specific atom probe tomography), and micro-mechanical testing techniques...
Poster
Full-text available
A masking technique to perform high accuracy diffraction experiments on FIB-machined specimens: we investigate and prevent damage on a surface near FIB milled features.

Questions

Questions (8)
Question
Where can I order a polished polycrystalline Silicon wafer? Any suggestions are welcome.
Thanks!
Question
Hi all,
We are trying to prepare pure Zn for EBSD analysis through electropolishing, without good results. We currently use Struers A2 electrolyte and have tried varying voltage levels, but there seems to form an extra layer hindering EBSD.
Any suggestions?
Thanks

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