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“Determination of the atomic width of an APB in ordered CoPt using quantified HAADF-STEM”. Akamine H, Van den Bos KHW, Gauquelin N, Farjami S, Van Aert S, Schryvers D, Nishida M, Journal of alloys and compounds 644, 570 (2015). http://doi.org/10.1016/j.jallcom.2015.04.205
Abstract: Anti-phase boundaries (APBs) in an ordered CoPt alloy are planar defects which disturb the ordered structure in their vicinity and decrease the magnetic properties. However, it has not yet been clarified to what extend the APBs disturb the ordering. In this study, high-resolution HAADF-STEM images are statistically analysed based on the image intensities estimated by the statistical parameter estimation theory. In the procedure, averaging intensities, fitting the intensity profiles to specific functions, and assessment based on a statistical test are performed. As a result, the APBs in the stable CoPt are found to be characterised by two atomic planes, and a contrast transition range as well as the centre of an inclined APB is determined. These results show that the APBs are quite sharp and therefore may have no notable effect on the net magnetic properties due to their small volume fraction. (C) 2015 Elsevier B.V. All rights reserved.
Keywords: A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Impact Factor: 3.133
Times cited: 12
DOI: 10.1016/j.jallcom.2015.04.205
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“The growth of Ni5Al3 in L10 martensite studied by in situ transmission electron microscopy and high resolution electron microscopy”. Schryvers D, Ma Y, Journal of alloys and compounds 221, 227 (1995). http://doi.org/10.1016/0925-8388(94)01467-1
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.999
Times cited: 19
DOI: 10.1016/0925-8388(94)01467-1
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“In situ high resolution electron microscopy observation of electron-irradiation-induced martensitic transformation in a Ni63Al37 alloy”. Muto S, Schryvers D, Journal of alloys and compounds 199, 1 (1993). http://doi.org/10.1016/0925-8388(93)90422-J
Abstract: An electron-irradiation-induced transformation from cubic beta2 austenite to monoclinic 7M martensite was observed in situ under high resolution electron microscopy conditions in a thin foil of Ni63Al37 beta2 phase (B2, CsCl structure), with the start temperature of the martensitic transformation below but very close to room temperature. The structure of the martensite is consistent with thermoelastic or stress-induced martensite at this composition, including the existence of multiple stacking faults. The transformation is described by a gradual increase in the shear and shuffle amplitudes already existing in the precursor domains. Possible origins of the transformation are discussed.
Keywords: A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Impact Factor: 2.999
Times cited: 8
DOI: 10.1016/0925-8388(93)90422-J
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“Microstructural dependence on middle eigenvalue in Ti-Ni-Au”. Shi H, Delville R, Srivastava V, James RD, Schryvers D, Journal of alloys and compounds 582, 703 (2013). http://doi.org/10.1016/j.jallcom.2013.08.132
Abstract: The microstructure of various compounds of the Ti-Ni-Au alloy system is investigated by transmission electron microscopy in relation with changing lattice parameters improving the compatibility conditions between austenite and martensite expressed by the lambda(2) = 1 equation based on the Geometrically NonLinear Theory of Martensite (GNLTM). Although local differences in microstructure are observed, when increasing the gold content compound twins are replaced by Type I twins, while twinned lamellar structures are replaced by untwinned plates and self-accommodating structures when lambda(2) = 1 is approached, all confirming the predictions of the GNLTM. (c) 2013 Elsevier B.V. All rights reserved.
Keywords: A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Impact Factor: 3.133
Times cited: 8
DOI: 10.1016/j.jallcom.2013.08.132
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“Microstructure and precipitates in annealed Co38Ni33Al29 ferromagnetic shape memory alloy”. Lu JB, Shi H, Sedlakova-Ignacova S, Espinoza R, Kopeček J, Sittner P, Bártová, B, Schryvers D, Journal of alloys and compounds 572, 5 (2013). http://doi.org/10.1016/j.jallcom.2013.03.228
Abstract: Transmission electron microscopy was performed to investigate the microstructure and precipitates in the annealed Co38Ni33Al29 ferromagnetic shape memory alloy. Apart from the dendritic secondary phase in the austenite matrix, micron-sized (up to 100 μm) fcc-based precipitates with partial γ′ L12 ordering and containing none, one or three {1 1 1}p parallel twin planes were found. The orientation relationship between the precipitates and matrix was found to be KurdjumovSachs. STEMEDX analysis indicates that twinned and non-twinned precipitates are Co-rich and Al- and Ni-deficient with respect to the matrix and with a lower Co/Al ratio for the latter. The 3D morphologies of precipitates were reconstructed with focused ion beam/scanning electron microscope dual-beam slice-and-view imaging, showing that the single {1 1 1}p plane twinned precipitates have a plate-like shape while the non-twinned precipitates are lath-like and often bent.
Keywords: A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Impact Factor: 3.133
Times cited: 10
DOI: 10.1016/j.jallcom.2013.03.228
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“Morphological characterization and distribution of autocatalytic-grown Ni4Ti3 precipitates in a Ni-Ti single crystal”. Cao S, Ke CB, Zhang XP, Schryvers D, Journal of alloys and compounds 577, 215 (2013). http://doi.org/10.1016/j.jallcom.2012.02.013
Abstract: The 3D size, morphology and distribution of autocatalytic-grown Ni4Ti3 precipitates in a Ni51Ti49 single crystal were characterized via a FIB/SEM Slice-and-View procedure and phase-field simulation. Important parameters on size and shape of the precipitates were measured. The pair distribution function and the minimum distance between two precipitates from different variants were calculated to describe the 3D distribution of the autocatalytic-grown Ni4Ti3 precipitates in single crystal Ni-Ti, with a comparison to the polycrystalline Ni50.8Ti49.2 alloy. Phase-field simulation was conducted to study the nucleation behavior of precipitates in the single crystal Ni-Ti. (C) 2012 Elsevier B.V. All rights reserved.
Keywords: A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Impact Factor: 3.133
Times cited: 5
DOI: 10.1016/j.jallcom.2012.02.013
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“Recent EM investigations on nano-and micro-defect structures in SMAs”. Schryvers D, Cao S, Pourbabak, Shi H, Lu, Journal of alloys and compounds 577, S705 (2013). http://doi.org/10.1016/j.jallcom.2011.10.112
Abstract: The present contribution reviews some recent electron microscopy investigations on different shape memory systems in which a variety of nano- and micro-defect structures play an essential role in the functional behaviour of the material. (NiTi3)-Ti-4 precipitates in Ni-Ti are a well-known example for which the focus is now on the 3D configurations, in Ni-Ti-Nb Nb-rich nanoprecipitates are thought to have a large impact on the hysteresis, in Co-Ni-Al an Al-enriched zone nearby the y'-precipitates yields a small sandwiched austenite while some first signs of quasidynamical lattice deformation in non-frozen Ni-Ti strain glass are measured by Cs-aberration-corrected transmission electron microscopy. (C) 2011 Elsevier B.V. All rights reserved.
Keywords: A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Impact Factor: 3.133
Times cited: 7
DOI: 10.1016/j.jallcom.2011.10.112
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“Unexpected ordering behaviour of Pt3Al intermetallic precipitates”. Douglas A, Neethling JH, Santamarta R, Schryvers D, Cornish LA, Journal of alloys and compounds 432, 96 (2007). http://doi.org/10.1016/j.jallcom.2006.05.106
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.133
Times cited: 18
DOI: 10.1016/j.jallcom.2006.05.106
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“TEM and Raman characterisation of diamond micro- and nanostructures in carbon spherules from upper soils”. Yang ZQ, Verbeeck J, Schryvers D, Tarcea N, Popp J, Rösler W, Diamond and related materials 17, 937 (2008). http://doi.org/10.1016/j.diamond.2008.01.104
Abstract: Carbonaceous spherules of millimeter size diameter and found in the upper soils throughout Europe are investigated by TEM, including SAED, HRTEM and EELS, and Raman spectroscopy. The spherules consist primarily of carbon and have an open cell-like internal structure. Most of the carbon appears in an amorphous state, but different morphologies of nano- and microdiamond particles have also been discovered including flake shapes. The latter observation, together with the original findings of some of these spherules in crater-like structures in the landscape and including severely deformed rocks with some spherules being embedded in the fused crust of excavated rocks, points towards unique conditions of origin for these spherules and particles, possibly of exogenic origin. (C) 2008 Elsevier B.V. All rights reserved.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.561
Times cited: 26
DOI: 10.1016/j.diamond.2008.01.104
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“Revealing the innermost nanostructure of sputtered NiCrOx solar absorber cermets”. Gaouyat L, He Z, Colomer J-F, Lambin P, Mirabella F, Schryvers D, Deparis O, Solar energy materials and solar cells 122, 303 (2014). http://doi.org/10.1016/j.solmat.2013.10.009
Abstract: Conversion of solar energy into thermal energy helps reducing consumption of non-renewable energies. Cermets (ceramicmetal composites) are versatile materials suitable, amongst other applications, for solar selective absorbers. Although the presence of metallic Ni particles in the dielectric matrix is a prerequisite for efficient solar selective absorption in NiCrOx cermets, no clear evidence of such particles is reported so far. By combining comprehensive chemical and structural analyses, we reveal the presumed nanostructure which is at the origin of the remarkable optical properties of this cermet material. Using sputtered NiCrOx layers in a solar absorber multilayer stack on aluminium substrate allows us to achieve solar absorptance as high as α=96.1% while keeping thermal emissivity as low as ε=2.2%, both values being comparable to best values recorded so far. With the nanostructure of sputtered NiCrOx cermets eventually revealed, further optimization of solar absorbers can be anticipated and technological exploitation of cermet materials in other applications can be foreseen.
Keywords: A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Impact Factor: 4.784
Times cited: 12
DOI: 10.1016/j.solmat.2013.10.009
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“Direct observation of ferrielectricity at ferroelastic domain boundaries in CaTiO3 by electron microscopy”. Van Aert S, Turner S, Delville R, Schryvers D, Van Tendeloo G, Salje EKH, Advanced materials 24, 523 (2012). http://doi.org/10.1002/adma.201103717
Abstract: High-resolution aberration-corrected transmission electron microscopy aided by statistical parameter estimation theory is used to quantify localized displacements at a (110) twin boundary in orthorhombic CaTiO3. The displacements are 36 pm for the Ti atoms and confined to a thin layer. This is the first direct observation of the generation of ferroelectricity by interfaces inside this material which opens the door for domain boundary engineering.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 19.791
Times cited: 150
DOI: 10.1002/adma.201103717
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“Ultrahigh strain hardening in thin palladium films with nanoscale twins”. Idrissi H, Wang B, Colla MS, Raskin JP, Schryvers D, Pardoen T, Advanced materials 23, 2119 (2011). http://doi.org/10.1002/adma.201004160
Abstract: Nanocrystalline Pd thin films containing coherent growth twin boundaries are deformed using on-chip nanomechanical testing. A large work-hardening capacity is measured. The origin of the observed behavior is unraveled using transmission electron microscopy and shows specific dislocations and twin boundaries interactions. The results indicate the potential for large strength and ductility balance enhancement in Pd films, as needed in membranes for H technologies.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 19.791
Times cited: 57
DOI: 10.1002/adma.201004160
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“The corrosion process of sterling silver exposed to a Na2S solution: monitoring and characterizing the complex surface evolution using a multi-analytical approach”. Schalm O, Crabbé, A, Storme P, Wiesinger R, Gambirasi A, Grieten E, Tack P, Bauters S, Kleber C, Favaro M, Schryvers D, Vincze L, Terryn H, Patelli A, Applied Physics A-Materials Science &, Processing 122, 903 (2016). http://doi.org/10.1007/s00339-016-0436-6
Abstract: Many historical ‘silver’ objects are composed of sterling silver, a silver alloy containing small amounts of copper. Besides the dramatic impact of copper on the corrosion process, the chemical composition of the corrosion layer evolves continuously. The evolution of the surface during the exposure to a Na2S solution was monitored by means of visual observation at macroscopic level, chemical analysis at microscopic level and analysis at the nanoscopic level. The corrosion process starts with the preferential oxidation of copper, forming mixtures of oxides and sulphides while voids are being created beneath the corrosion layer. Only at a later stage, the silver below the corrosion layer is consumed. This results in the formation of jalpaite and at a later stage of acanthite. The acanthite is found inside the corrosion layer at the boundaries of jalpaite grains and as individual grains between the jalpaite grains but also as a thin film on top of the corrosion layer. The corrosion process could be described as a sequence of 5 subsequent surface states with transitions between these states.
Keywords: A1 Journal article; Electron Microscopy for Materials Science (EMAT);
Impact Factor: 1.455
Times cited: 9
DOI: 10.1007/s00339-016-0436-6
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“A TEM study of nanoparticles in lustre glazes”. Fredrickx P, Helary D, Schryvers D, Darque-Ceretti E, Applied physics A : materials science &, processing 79, 283 (2004). http://doi.org/10.1007/s00339-004-2515-3
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.455
Times cited: 16
DOI: 10.1007/s00339-004-2515-3
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“Epitaxial Ni-Al thin films on NaCl using a Ag buffer layer”. Yandouzi M, Toth L, Vasudevan V, Cannaerts M, van Haesendonck C, Schryvers D, Philosophical magazine letters 80, 719 (2000). http://doi.org/10.1080/09500830050192936
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.941
Times cited: 2
DOI: 10.1080/09500830050192936
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“The martensitic phase transition in Ni-Al: experimental observation of excess entropy and heterogeneous spontaneous strain”. Zhang H, Salje EKH, Schryvers D, Bartova B, Journal of physics : condensed matter 20, 055220 (2008). http://doi.org/10.1088/0953-8984/20/5/055220
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.649
Times cited: 7
DOI: 10.1088/0953-8984/20/5/055220
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“HREM and ED study of the displacive transformation of the Ni2Al phase in a Ni65Al35 alloy and associated with the martensitic transformation”. Muto S, Schryvers D, Merk N, Tanner LE, Acta metallurgica et materialia 41, 2377 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 31
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“Electron microscopy study of the formation of Ni5Al3 in a Ni62.5Al37.5 B2 alloy: 1: precipitation and growth”. Schryvers D, Ma Y, Toth L, Tanner LE, Acta metallurgica et materialia 43, 4045 (1995). http://doi.org/10.1016/0956-7151(95)00101-Z
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 27
DOI: 10.1016/0956-7151(95)00101-Z
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“Electron microscopy study of the formation of Ni5Al3 in a Ni62.5Al37.5 B2 alloy: 2: plate crystallography”. Schryvers D, Ma Y, Toth L, Tanner LE, Acta metallurgica et materialia 43, 4057 (1995). http://doi.org/10.1016/0956-7151(95)00102-2
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 11
DOI: 10.1016/0956-7151(95)00102-2
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“Cross-section transmission electron microscopy characterization of the near-surface structure of medical Nitinol superelastic tubing”. Potapov PL, Tirry W, Schryvers D, Sivel VGM, Wu M-Y, Aslanidis D, Zandbergen H, Journal of materials science: materials in medicine 18, 483 (2007). http://doi.org/10.1007/s10856-007-2008-y
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.325
Times cited: 14
DOI: 10.1007/s10856-007-2008-y
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“ELNES study of carbon K-edge spectra of plasma deposited carbon films”. Hamon A-L, Verbeeck J, Schryvers D, Benedikt J, van den Sanden RMCM, Journal of materials chemistry 14, 2030 (2004). http://doi.org/10.1039/b406468m
Abstract: Electron energy loss spectroscopy was used to investigate the bonding of plasma deposited carbon films. The experimental conditions include the use of a specific collection angle for which the shape of the spectra is free of the orientation dependency usually encountered in graphite due to its anisotropic structure. The first quantification process of the energy loss near-edge structure was performed by a standard fit of the collected spectrum, corrected for background and multiple scattering, with three Gaussian functions followed by a comparison with the graphite spectrum obtained under equivalent experimental conditions. In a second approach a fitting model directly incorporating the background subtraction and multiple scattering removal was applied. The final numerical results are interpreted in view of the deposition conditions of the films and the actual fitting procedure with the related choice of parameters.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 6.626
Times cited: 61
DOI: 10.1039/b406468m
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“High resolution transmission electron microscopy study of nanoscale Ni-rich Ni-Al films evaporated onto NaCl and KCl”. Yandouzi M, Toth L, Schryvers D, Nanostructured materials 10, 99 (1998). http://doi.org/10.1016/S0965-9773(98)00025-7
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1016/S0965-9773(98)00025-7
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“Austenite and martensite microstructures in splat-cooled Ni-Al”. Schryvers D, Holland-Moritz D, Intermetallics 6, 427 (1998). http://doi.org/10.1016/S0966-9795(97)00091-5
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.14
Times cited: 13
DOI: 10.1016/S0966-9795(97)00091-5
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“Cavity nucleation and growth in Cu-Zn-Al irradiated with Cu+ ions at different temperatures”. Zelaya E, Schryvers D, Tolley A, Fitchner PFP, Intermetallics 18, 493 (2010). http://doi.org/10.1016/j.intermet.2009.09.010
Abstract: The effects of high dose ion irradiation in β CuZnAl were investigated between room temperature and 150 °C. Single crystal samples with surface normal close to [001]β were irradiated with 300 keV Cu+ ions. Microstructural changes were characterized using transmission electron microscopy. Irradiation induced cavities located on the surface exposed to the irradiation were observed. The morphology, size and density distribution of these cavities were analyzed as a function of different irradiation conditions. The shape and location of the cavities with respect to the irradiation surface were not affected by irradiation temperature or irradiation dose. Instead, the cavity size distribution showed a bi-modal shape for a dose of 15 dpa, regardless of irradiation temperature. For a dose of 30 dpa the bi-modal distribution was only observed after room temperature irradiation. The diffusion effects of vacancies produced by irradiation are analyzed in shape memory CuZnAl alloys, which main characteristic is the diffusionless martensitic transformation. Particularly, the cavity size distributions were analyzed in terms of nucleation, growth and coalescence.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.14
Times cited: 1
DOI: 10.1016/j.intermet.2009.09.010
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“Grain growth and precipitation in an annealed cold-rolled Ni50.2Ti49.8 alloy”. Srivastava AK, Schryvers D, van Humbeeck J, Intermetallics 15, 1538 (2007). http://doi.org/10.1016/j.intermet.2007.06.003
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.14
Times cited: 37
DOI: 10.1016/j.intermet.2007.06.003
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“Phase transformations and precipitation in amorphous Ti50Ni25Cu25 ribbons”. Satto C, Ledda A, Potapov P, Janssens JF, Schryvers D, Intermetallics 9, 395 (2001). http://doi.org/10.1016/S0966-9795(01)00015-2
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.14
Times cited: 16
DOI: 10.1016/S0966-9795(01)00015-2
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“Recrystallization and grain growth in a B2 iron aluminide alloy”. Samajdar I, Ratchev P, Verlinden B, Schryvers D, Intermetallics 6, 419 (1998). http://doi.org/10.1016/S0966-9795(97)00092-7
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.14
Times cited: 17
DOI: 10.1016/S0966-9795(97)00092-7
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“Transmission electron microscopy study of combined precipitation of Ti2Ni(Pd) and Ti2Pd(Ni) in a Ti50Ni30Pd20 alloy”. Delville R, Schryvers D, Intermetallics 18, 2353 (2010). http://doi.org/10.1016/j.intermet.2010.08.006
Abstract: We report a new mode of precipitation in a B19 martensitic Ti50Ni30Pd20 shape memory alloy consisting of a central Ti2Ni(Pd) precipitate surrounded by an austenite area containing Ti2Pd(Ni) precipitates. The morphology and crystallography of the precipitation area is investigated using conventional and high resolution electron microscopy. In particular, the orientation relationship and the coherency strain between the Ti2Pd(Ni) precipitate and the surrounding retained B2 matrix are discussed. A study of local composition in relation with a ternary phase diagram using X-ray energy dispersive spectroscopy with a nanoprobe gives evidences of the formation mechanism.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.14
Times cited: 9
DOI: 10.1016/j.intermet.2010.08.006
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“Twinned b.c.c. sherical particles in a partially crystallised Ti50Ni25Cu25 melt-spun ribbon”. Santamarta R, Schryvers D, Intermetallics 12, 341 (2004). http://doi.org/10.1016/j.intermet.2003.12.002
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.14
Times cited: 14
DOI: 10.1016/j.intermet.2003.12.002
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“Quantitative in-situ TEM nanotensile testing of single crystal Ni facilitated by a new sample preparation approach”. Samaeeaghmiyoni V, Idrissi H, Groten J, Schwaiger R, Schryvers D, Micron 94, 66 (2017). http://doi.org/10.1016/j.micron.2016.12.005
Abstract: Twin-jet electro-polishing and Focused Ion Beam (FIB) were combined to produce small size Nickel single crystal specimens for quantitative in-situ nanotensile experiments in the transmission electron microscope. The combination of these techniques allows producing samples with nearly defect-free zones in the centre in contrast to conventional FIB-prepared samples. Since TEM investigations can be performed on the electro-polished samples prior to in-situ TEM straining, specimens with desired crystallographic orientation and initial microstructure can be prepared. The present results reveal a dislocation nucleation controlled plasticity, in which small loops induced by FIB near the edges of the samples play a central role.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.98
Times cited: 11
DOI: 10.1016/j.micron.2016.12.005
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