Bart Winiarski

Thermo Fisher Scientific s.r.o.

The mesostructure of porous electrodes used in lithium-ion batteries strongly influences cell performance. Accurate imaging of the distribution of phases in these electrodes would allow this relationship to be better understood through simulation. However, imaging the nanoscale features in these components is challenging. In this study, a technique...

In order to better understand the mechanisms of environmentally-assisted cracking (EAC) of 7xxx aluminium aerospace alloys, large scale serial sectioning using the newly developed femtosecond laser plasma focused ion-beam (laser PFIB) has been performed on both AA7050 and AA7085 alloys containing environmentally-assisted cracks introduced during ac...

The mesostructure of porous electrodes used in lithium-ion batteries strongly influences cell performance. Accurate imaging of the distribution of phases in these electrodes would allow this relationship to be better understood through simulation. However, imaging the nanoscale features in these components is challenging. While scanning electron mi...

Lithium batteries are energy storage systems with highly complex microstructures. To understand the performance of the battery it is essential to accurately characterize the battery microstructure at multiple length scales. However, there are multiple challenges in battery characterization such as beam damage, imaging liquid phases and getting to r...

There is an increasing requirement for the acquisition of large two (2D) or three (3D) dimensional electron back scattered diffraction (EBSD) maps. It is a well-known, but largely neglected fact, that EBSD maps may contain distortions. There are long-range distortions, which can be caused by the interaction of the sample and the beam geometry and i...

In the past decades, the rapid growth of electric vehicles and consumer electronics market leads battery technology to attract significant attention. In order to further advance battery technology, in-depth understanding on the electrode and interface structure of battery materials are essential. Focused ion beam – scanning electron microscope is a...

https://analyticalscience.wiley.com/do/10.1002/was.00070019

Improvements in Low Voltage PFIB for Sample Preparation and Large Volume Serial Sectioning Tomography - Brandon van Leer, Lee Casalena, Jeremy Graham, Bartlomiej Winiarski

Post-fatigue Investigation of SLM Ti64 Scaffolds by 3D Correlative Tomography - Bartlomiej Winiarski, Michelle Dallago, Matteo Benedetti, Philip J. Withers

Cross-platform Holder Kit for a Real 3D Correlative Tomography and Microscopy - Bartlomiej Winiarski, Grzegorz Pyka, Ali Chirazi, Daniel Lichau

Plasma FIB Spin Milling Accelerates Battery Research - Bartlomiej Winiarski

Advances in Multi-Beam and Multi-Ion FIB-SEM for 3D Correlative Microscopy - Volume 25 Supplement - B. Winiarski, R. Geurts, S.J. Randolph, R. Gannon, G. Pyka, T. Varslot, P.J. Withers

Plasma FIB Spin Milling for 3D Residual Stress Measurements - Volume 25 Supplement - B. Winiarski, C. Rue, P.J. Withers

Plasma FIB Spin Milling for Large Volume Serial Sectioning Tomography - Volume 25 Supplement - B. Winiarski, C. Rue, P.J. Withers

Femtosecond Laser-Enabled TriBeam as a Platform for Analysis of Thermally- and Charge-Sensitive Materials - Volume 25 Supplement - SJ Randolph, R Geurts, J Wang, B Winiarski, C Rue

In order to perform site-specific mechanical studies to examine the contribution or interaction of a material constituent, a reliable methodology for the production of small-scale samples is required. With the high milling rates achievable with the newly developed Xe+plasma FIB (PFIB), it is now possible to manufacture specimens approaching the sma...

Porous structures have great potential in the biomedical field because, compared to traditional fully dense implants, prostheses with a porous structure show reduced stress shielding and improved osseo-integration. Selective Laser Melting (SLM) made possible to obtain metallic cellular materials with highly complex structures characterized by a wid...

Investigation of Cracking in Additively Manufactured IN718 by Correlative Tomography - Volume 24 Supplement - B. Winiarski, G. Pyka, C.A. Wade, A. Chirazi, D. Lichau, G.M. Burke, P.J. Withers

Investigation of slice thickness for FIB tomography in a plasma focused ion beam system - Volume 24 Supplement - Brandon Van Leer, Ron Kelley, Bartlomiej Winiarski

We demonstrate the capability of a novel Electron Backscatter Diffraction (EBSD) dictionary indexing (DI) approach by means of orientation mapping of a highly deformed graded microstructure in a shot peened Aluminium 7075-T651 alloy. A low microscope accelerating voltage was used to extract, for the first time from a bulk sample, statistically sign...

http://www.microscopyebooks.com/Americas/Supplements/2017/November/ ---------------------------------------------------------------------------------------------------------------------------------------------- Biological materials generally have complex three-dimensional (3D) hierarchical microstructures, which give rise to interesting combination...

Developments in Large Volume 3D Analysis via P-FIB: EBSD & EDS - Volume 23 Issue S1 - J. Lindsay, T.L. Burnett, J. Goulden, P. Frankel, A. Garner, B. Winiarski, P. J Withers

Correlative Tomography for Additive Manufacturing of Biomedical Implants - Volume 23 Issue S1 - B. Winiarski, G. Pyka, M. Benedatti, T.L. Burnett, D. Laeveren, M. Dallago, P.J. Withers

Microstructure inhomogeneity is imparted into the surface of a Vit1b Zr-based bulk metallic glass (BMG) using ultrasonic nanocrystal surface modification (UNSM). As a result, compressive residual stresses with a maximum magnitude of 1130 MPa were induced in the near-surface region. Substantial improvements in both fracture strain and strength were...

Fully dense titanium alloy implants have long been used for the replacement and stabilization of damaged bone tissue. Nevertheless, they can cause stress shielding which brings to a loss of bone mass. Additive manufacturing (AM) allows obtaining highly porous cellular structures with a wide range of cell morphologies to tune the mechanical properti...

Here we examine the potential of serial Broad Ion Beam (BIB) Ar⁺ ion polishing as an advanced serial section tomography (SST) technique for destructive 3D material characterisation for collecting data from volumes with lateral dimensions significantly greater than 100 µm and potentially over millimetre sized areas. Further, the associated low level...

div class="title"> A Xe + Plasma FIB Milling and Lift-out Approach for Site-specific Preparation of Large Volume Blocks for 3D-EBSD - Volume 22 Issue S3 - B. Winiarski, T.L. Burnett, P.J. Withers

The moderately high lateral RS gradients (on the order of tens of MPa/μm) near shot peened notches in conjunction with the shallow treatment depth (some hundreds of microns) limit the application of far-field and/or high resolution synchrotron diffraction residual stress measurement techniques. Recently proposed Focused Ion Beam – Scanning Elecron...

The knowledge of the residual stress (RS) field in the vicinity of a notch is of paramount importance to understand the fatigue resistance of shot peened components containing such stress raisers. In the first part of this work (Winiarski et al. 2016, Exp. Mech.), RS were measured along the notch bisector using non-destructive and destructive techn...

The knowledge of the residual stress field in the vicinity of the notch of shot peened fatigue specimens is of paramount importance to understand the fatigue resistance of components carrying stress raisers and subjected to surface treatments aimed at introducing compressive residual stresses. For this purpose, residual stresses were measured along...

Micro-Hole Drilling (μHD) and Micro-Slot Cutting (μSC) methods for the measurement of residual stress at the micron scale have recently been proposed but have yet to be evaluated and validated against other methods such as X-ray Diffraction (XRD). In this paper near surface and sub-surface residual stresses were measured in ceramic-shot peened and...

Shot peening strongly increases the notch fatigue strength of metallic components. This benefit is mainly attributed to compressive residual stresses. In this paper, we address this topic by performing bending fatigue tests on Al-7075-T651 samples carrying notches with different severity. Fatigue lives between 105 and 108 cycles have been explored....

Ga(+) Focused Ion Beam-Scanning Electron Microscopes (FIB-SEM) have revolutionised the level of microstructural information that can be recovered in 3D by block face serial section tomography (SST), as well as enabling the site-specific removal of smaller regions for subsequent transmission electron microscope (TEM) examination. However, Ga(+) FIB...

div class="title">Large volume 3D characterization by plasma FIB DualBeam microscopy - Volume 21 Issue S3 - T L Burnett, R Kelley, B Winiarski, M Daly, K Mani, P J Withers

The advent of dual-beam focused ion beam - field emission gun scanning electron microscope (FIB-SEM) imaging and milling systems in combination with digital image correlation (DIC) analysis has made it possible to make very fine excisions and to record the resulting displacements with nanometre precision. This has led to novel implementations of ma...

The Zr-based bulk metallic glasses (BMGs) are a new family of attractive materials with good glass-forming ability and excellent mechanical properties, such as high strength and good wear resistance, which make them candidates for structural and biomedical materials. Although the mechanical behavior of BMGs has been widely investigated, their defor...

The use of focused ion beam (FIB) microscopes to characterise the microstructure of materials in three dimensions, by reconstruction of serial sections, has rapidly grown during the last decade. This is due to improved capabilities in material characterisation and more effective control of the ion beam to cut cross sections in a wide range of mater...

In-situ synchrotron x-ray experiments have been used to follow the evolution of the diffraction peaks for crystalline dendrites embedded in a bulk metallic glass matrix subjected to a compressive loading-unloading cycle. We observe irreversible diffraction-peak splitting even though the load does not go beyond half of the bulk yield strength. The c...

The use of focused ion beam (FIB) microscopes to characterise the microstructure of materials in three dimensions, by reconstruction of serial sections, has rapidly grown during the last decade. This is due to improved capabilities in material characterisation and more effective control of the ion beam to cut cross sections in a wide range of mater...

In the present work, the size distribution and shape of WC grains in cemented carbides (WC–Co), with different Co contents, have been investigated in three dimensions. Direct three-dimensional (3-D) measurements, using focused ion beam serial sectioning and electron backscattered diffraction (EBSD), were performed and a 3-D microstructure was recon...

In this paper, effects of cooling rates on glass formation and magnetic behavior of the Fe73.0C7.0Si3.3B5.0P8.7Mo3.0 (at. pct) alloy were investigated via different purging gases (i.e., helium and argon) during suction casting. X-ray diffraction patterns and transmission electron microscopy characterization confirmed that the maximum attainable dia...

This paper reports a new technique, namely the incremental micro-hole-drilling method (IμHD) for mapping in-plane residual or applied stresses incrementally as a function of depth at the micron-scale laterally and the sub-micron scale depth-wise. Analogous to its macroscale counterpart, it is applicable either to crystalline or amorphous materials,...

This paper reports a new technique, namely the incremental micro-slotting cutting method, for the investigation of residual stress profiles as a function of depth on a micron scale. The residual-stresses in a peened bulk-metallic glass (BMG) (Zr50Cu40Al10, in atomic per cent) are estimated using finite-element analysis of the surface relaxations, a...

A full-field, multi-axial computation technique is described for determining residual stresses using the hole-drilling method with DIC. The computational method takes advantage of the large quantity of data available from full-field images to ameliorate the effect of modest deformation sensitivity of DIC measurements. It also provides uniform resid...

The mechanical properties of high-performance steels are often reliant on the hard martensitic structure. It can either be the sole constituent e.g. in tool steels, or it can be part of a multi-phase structure as e.g. in dual-phase steels. It is well-known that the morphology of martensite changes from lath to plate martensite with increasing carbo...

Characterisation of WC-Co hardmetals using a focused ion beam scanning electron microscope (FIB-SEM) allows the three dimensional reconstruction of the microstructure and direct measurements of microstructural features such as binder phase, volume fraction and carbide grain size/shape. Using a FIB-SEM, 3D phase maps of WC-Co were created and EBSD u...

The mechanical properties of high-performance steels are often reliant on the hard martensitic structure. It can either be the sole constituent e.g. in tool steels, or it can be part of a multi-phase structure as e.g. in dual-phase steels. It is well-known that the morphology of martensite changes from lath to plate martensite with increasing carbo...

In-situ straining experiments and residual stress evaluations by micromachining require accurate measurement of surface displacements. Such measurements can be conveniently done using Digital Image Correlation (DIC). Three surface decoration techniques are presented to enhance surface deformation and residual stress measurement capabilities on micr...

Measuring residual-stresses at the micron scale in glassy materials imposes experimental challenges, particularly when using diffraction, or other conventional laboratory methods, e.g., optical non-contact methods, grid methods, etc. In this short paper, a technique for mapping residual-stress profiles in amorphous materials with high spatial defin...

Residual stresses in crystalline or glassy materials often play a key role in the performance of advanced devices and components. However, stresses in amorphous materials cannot easily be determined at the micron scale by diffraction, or by other conventional laboratory methods. In this article, a technique for mapping residual stress profiles in a...

Measuring residual stress at the sub-micron scale imposes experimental challenges. We propose a new technique, namely the incremental micro-hole-drilling method (I mu HW), for measurement of residual stress profiles as a function of depth with high spatial definition. Like its macroscale counterpart, it is applicable to either crystalline or amorph...

The onset of fracture process in a layered composite with coplanar interface cracks under compression along layers is studied within the scope of 3-D theory of stability using the model of piecewise-homogeneous medium. Each layer consists of a matrix reinforced by continuous parallel fibres and is modelled by a compressible, linear elastic, transve...

Laminar composites due to their internal structure and manufacturing methods contain a number of inter- and intra-component defects whose size, dispersion and mutual interaction alter significantly the critical compression strain level. The current paper investigates crack interaction in transversely isotropic materials compressed in a static manne...

The non-classical problem of fracture mechanics of composites compressed along the layers with interfacial cracks is analysed. The statement of the problem is based on the model of piecewise homogeneous medium, the most accurate within the framework of the mechanics of deformable bodies as applied to composites. The condition of plane strain state...

Aviation and aerospace structural components made of composite laminates due to their internal structure and manufacturing methods often contain a number of inter- and intra-component defects which size, dispersion and interaction alter significantly the critical compression strain level [1]. The current study investigates the effect of the cracks...

The current paper addresses the problem of 2-D modelling of the onset of failure process in a layered composite with periodic array of interfacial cracks under static compression along layers. The statement of the problem is based on the most accurate approach, the model of piecewise-homogenous medium. The condition of plane strain state is conside...

Laminar composites due to their internal structure and manufacturing methods contain a number of inter- and intra- component defects which size, dispersion and mutual interaction alter significantly the critical compression strain level. The current paper is one of the first attempts to study the crack interaction in orthotropic materials compresse...

The subject of the work was to study the effect of Ti thin film on alumina ceramic on mechanical strength and fracture character of Al2O3/Al/Al2O3 joints. The joints were formed by liquid state bonding of alumina substrates covered with titanium thin film of 800 nm thickness using Al interlayer of 30μm thickness at temperature of 973 K in a vacuum...

The subject of this work was the study of the mechanical strength, fracture character and microstructure of the Al2O3/Al/Al2O3 joints, formed by liquid-state bonding of alumina using Al interlayers of two thicknesses (30 and 300 µm) at a temperature of 973 K under a vacuum of 0.2 mPa for 5 min. The bend strength of the joints was measured by a four...

Zr-based bulk metallic glasses (BMGs) are a new family of attractive materials with good glass-forming ability and excellent mechanical properties. However, BMGs typically show near-zero ductility in tension and limited plasticity in compression, which significantly impedes the wide industrial application of BMGs. It was recently reported that the...