|
|
“Precursor phenomena in a quenched and aged Ni52Ti48 shape memory alloy”. Somsen C, Wassermann EF, Kästner J, Schryvers D, Journal de physique: 4
T2 –, 10th International Conference on Martensitic Transformations, JUN 10-14, 2002, ESPOO, FINLAND 112, 777 (2003). http://doi.org/10.1051/jp4:2003997
Abstract: We measured the electrical resistivity R(T) and specific heat C-p(T) between room temperature (RT) and 4.2 K as well as the microstructure by transmission electron microscopy (TEM) of a Ni-52 Ti-48 SMA quenched from 1000degreesC (B2-Phase range) to RT and then annealed for 1h at T=380degreesC, 550degreesC and 650degreesC. In the “as quenched” and the “650degreesC annealed” state no martensitic transformations (MT's) occur. The diffraction patterns show faint reflections originating from coherent Ni4Ti3 precipitates in an early state of formation. Additional reflections of the type 1/2 <110>, 1/2 <111> and 1/3 <110> result from various lattice displacement waves, which are precursors of the MT's to the B19' and R-phase, respectively. Indeed, high resolution TEM micrographs of the [001] zone of the “as quenched” sample reveal transverse 1/2 <110> <110> lattice displacement waves, precursors of the B19' martensite. The coherent Ni4Ti3 precipitates, homogeneously distributed on a small length scale, binder the MT's in the “as quenched” and the “650degreesC annealed” state, and thus only the precursors appear. When annealed at T=380degreesC, however, coherent Ni4Ti3 precipitates with a length of 10nm are clearly visible in TEM. These precipitates trigger the NIT from the B2 to the R-phase on cooling, as evidenced also by anomalies in R(T) and C-p(T). Annealing at T-550degreesC leads to the well known two step MT's from the B2 to the R-phase and then into the B19'-phase. These martensitic transitions are clearly seen as additional peaks in the specific heat and anomalies in the resistance, while the “as quenched” and 650degreesC annealed samples show weak features in R(T) and C-p(T).
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1051/jp4:2003997
|
|
|
|
“Electron diffraction refinement of the TiNi(Fe) R-phase structure”. Schryvers D, Potapov P, Journal de physique 112, 751 (2003). http://doi.org/10.1051/jp4:2003991
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 7
DOI: 10.1051/jp4:2003991
|
|
|
|
“The analysis of macrotwins in NiAl martensite”. Ball JM, Schryvers D, Journal de physique: 4
T2 –, 10th International Conference on Martensitic Transformations, JUN 10-14, 2002, ESPOO, FINLAND 112, 159 (2003). http://doi.org/10.1051/jp4:2003855
Abstract: We present a theoretical study of macrotwins arising in cubic to tetragonal martensitic transformations. The results help to explain some features of such macrotwins observed in Ni65Al35.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 11
DOI: 10.1051/jp4:2003855
|
|
|
|
“Microstructure of quenched Ni-rich Ni-Ti shape memory alloys”. Somsen C, Kästner J, Wassermann EF, Boullay P, Schryvers D, Journal de physique: 4
T2 –, 8th European Symposium on Martensitic Transformations (ESOMAT2000), SEP 04-08, 2000, COMO, ITALY 11, 445 (2001). http://doi.org/10.1051/jp4:2001874
Abstract: Microstructural investigations with transmission electron microscopy were carried out on quenched Ni-Ti alloys with 52 and 54.5 at% Ni. For the Ni52Ti48 specimen long time exposed diffraction patterns of a single grain show besides the expected reflections of the B2-phase, two sets of extra reflections in different zones. The first type of spots is explained by lattice displacement waves, which are regarded as precursors of the martensitic Ni-Ti phases, B 19' and R-phase, respectively. The second set of reflection with more diffuse intensity than the other reflections is related to Ni4Ti3 precipitates in an early state of formation. For the Ni-richer Ni54.5Ti45.5 alloy only Ni4Ti3 precipitates in an early state of formation are found but no precursors of the B 19'- and R-phase.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1051/jp4:2001874
|
|
|
|
“Structural characterisation of melt-spun Ti-Ni-Cu-ribbons”. Schryvers D, Potapov P, Ledda A, Shelyakov A, Journal de physique: 4 11, 363 (2001). http://doi.org/10.1051/jp4:2001861
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 1
DOI: 10.1051/jp4:2001861
|
|
|
|
“Lattice deformations at martensite-martensite interfaces in Ni-Al”. Schryvers D, Boullay P, Kohn R, Ball J, Journal de physique: 4 11, 23 (2001). http://doi.org/10.1051/jp4:2001804
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 9
DOI: 10.1051/jp4:2001804
|
|
|
|
“Nanoscale inhomogeneities in melt-spun Ni-Al”. Potapov P, Ochin P, Pons J, Schryvers D, Journal de physique: 4 11, 439 (2001). http://doi.org/10.1051/jp4:2001873
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 1
DOI: 10.1051/jp4:2001873
|
|
|
|
“From the lattice measurements of the austenite and the martensite cells to the macroscopic mechanical behavior of shape memory alloys”. Lexcellent C, Vivet A, Bouvet C, Blanc P, Satto C, Schryvers D, Journal de physique: 4 11, 317 (2001)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
|
|
|
|
“Influence of the lattice symmetry on melting of the bilayer Wigner crystal”. Schweigert IV, Schweigert VA, Peeters FM, Journal de physique: 4
T2 –, International Conference on Strongly Coupled Coulomb Systems, SEP 04-10, 1999, ST MALO, FRANCE 10, 117 (2000). http://doi.org/10.1051/jp4:2000515
Abstract: The melting transition of the five different lattices of a bilayer crystal is studied using the Monte-Carlo (MC) technique. We found the surprising result that the square lattice has a substantial larger melting temperature as compared to the other lattice structures, which is a consequence of the specific topology of the temperature induced defects. A new melting criterion is formulated which we show to be universal for bilayers as well as for single layer crystals.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
DOI: 10.1051/jp4:2000515
|
|
|
|
“Defect structures in CuZr martensite, studies by CTEM and HRTEM”. Seo JW, Schryvers D, Journal de physique: 4 C5, 149 (1997). http://doi.org/10.1051/jp4:1997523
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 1
DOI: 10.1051/jp4:1997523
|
|
|
|
“HRTEM study of austenite and martensite in splat-cooled and nanoscale thin film Ni-Al”. Schryvers D, Yandouzi M, Holland-Moritz D, Toth L, Journal de physique: 4 C5, 203 (1997). http://doi.org/10.1051/jp4:1997532
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1051/jp4:1997532
|
|
|
|
“Electron microscopy studies of martensite microstructures”. Schryvers D, Journal de physique: 4 C5, 109 (1997). http://doi.org/10.1051/jp4:1997517
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1051/jp4:1997517
|
|
|
|
“Analysis of Malagasy medical herbs by X-ray fluorescence in total reflectivity”. Razafindramisa FL, Andriambololona R, Brunel M, Van Grieken RE, Journal de physique: 4 6, 833 (1996)
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
|
|
|
|
“Ni2Al versus Ni5Al3 ordering in Ni65Al35 austenite and martensite”. Schryvers D, Toth L, van Humbeeck J, Beyer J, Journal de physique: colloques, suppléments 5, 1029 (1995). http://doi.org/10.1051/jp4/1995581029
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 12
DOI: 10.1051/jp4/1995581029
|
|
|
|
“SAED and HREM results suggest a NiTi B19' based superstructure for CuZr martensite”. Schryvers D, Journal de physique: colloques, suppléments 5, 1047 (1995). http://doi.org/10.1051/jp4/1995581047
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1051/jp4/1995581047
|
|
|
|
“Nucleation and growth of the Ni5Al3 phase in Ni-Al austenite and martensite”. Schryvers D, Toth L, Ma Y, Tanner L, Journal de physique: 4
T2 –, IIIrd European Symposium on Martensitic Transformations (ESOMAT 94), SEP 14-16, 1994, BARCELONA, SPAIN 5, 299 (1995). http://doi.org/10.1051/jp4:1995246
Abstract: The nucleation and growth mechanisms of Ni5Al3 precipitates and microtwinned plates in B2 austenite and 2M (3R) martensite phases are described on the basis of conventional and high resolution electron microscopy. In the Ni62.5Al37.5 B2 austenite matrix short annealings at 550 degrees C introduce three-pointed star shaped precipitates consisting of twin related parts of different variants of the Ni5Al3 structure. Longer annealings result in plates growing separately from these wings and developing microtwinning in order to accommodate stress built-up at the interfaces with the surrounding matrix. Annealing of Ni65Al35 2M martensite plates induces simple reordering into the Ni5Al3 phase, increasing the fct c/a ratio by about 1%. As a result stracking faults are introduced in the smallest twin variants.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 3
DOI: 10.1051/jp4:1995246
|
|
|
|
“Martensitic and related transformations in Ni-Al alloys”. Schryvers D, Journal de physique: 4
T2 –, IIIrd European Symposium on Martensitic Transformations (ESOMAT 94), SEP 14-16, 1994, BARCELONA, SPAIN 5, 225 (1995). http://doi.org/10.1051/jp4:1995235
Abstract: The present paper gives a review of results of recent studies investigating the fundamentals of the martensitic and related phase transformations in Ni-Al. For the former case, the emphasis will be on the microstructure of martensite plates. The latter include the metastable Ni2Al omega-like and stable Ni5Al3 bainitic phases. These phases will be discussed in view of their atomic structure, nucleation, growth and effect on the martensitic transformation. A separate chapter will deal with precursor effects.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 21
DOI: 10.1051/jp4:1995235
|
|
|
|
“Laser induced phase transition in iron thin films”. Teodorescu VS, Mihailescu IN, Dinescu M, Chitica N, Nistor LC, van Landuyt J, Barborica A, Journal de physique: 3: applied physics, materials science, fluids, plasma and instrumentation 4, 127 (1994). http://doi.org/10.1051/jp4:1994427
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1051/jp4:1994427
|
|
|
|
“Nucleation and growth of the Ni5Al3 in NiAl austenite and martensite”. Schryvers D, Toth L, Ma Y, Tanner LE, Journal de physique: 4 C2, 299 (1994)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
|
|
|
|
“Martensitic and bainitic transformations in Ni-Al alloys”. Schryvers D, Journal de physique: 4 C2, 225 (1994)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
|
|
|
|
“Mécanismes de la non-stoechiométrie dans les nouveaux supraconducteurs à, haute Tc”. Hervieu M, Michel C, Martin C, Huvé, M, Van Tendeloo G, Maignan A, Pelloquin D, Goutenoire F, Raveau B, Journal de physique: 3: applied physics, materials science, fluids, plasma and instrumentation 4, 2057 (1994)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
|
|
|
|
“Ordering principles for tetrahedral chains in Ga- and Co-substituted YBCO intergrowths”. Milat O, Krekels T, Van Tendeloo G, Amelinckx S, Journal de physique: 1: physique générale, physique statistique, matière condensée, domaines interdisciplinaires 3, 1219 (1993)
Abstract: A model for superstructure ordering in the <<chain>> layers of Ga (Co) substituted YBCO intergrowths with general formula (REO2)NSr2MCu2O5 (M = Co, Ga; n = 1, 2, ...) is proposed. By Ga or Co substitution for Cu, the structure of the <<chain>> layer changes : instead of the CuO4 planar squares, the chains consist of MO4 tetrahedra (M = Ga, Co) running along the [110] perovskite direction. The existing model for the Ga substituted <<123>> implies that all the chains are the same. Our new model is based on the results of Electron diffraction and High-resolution electron microscopy investigations. The model reveals the occurrence of two types of chains as a consequence of <<opposite>> ordering between neighbouring tetrahedra. The comer linked tetrahedra in each chain appear as alternatingly rotated in opposite sense, and a chain itself, as being displaced with respect to the underlying structure in one of two senses ; either forth (right) or back (left) along the chain direction. The regular alternation of chains of opposite type doubles the periodicity within a layer and induces the possibility for intrinsic disorder in the chain layer stacking sequence. The planar superstructure and a staggered stacking of the tetrahedral chain layers is found irrespective of the rest of the intergrowth structure. Superstructure ordering in the case of Co substitution is more perfect than for the Ga substitution.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 16
|
|
|
|
“Automated quantitative electron-microprobe analysis of particulate material”. Van Dyck P, Storms H, Van Grieken R, Journal de physique 45, 781 (1984). http://doi.org/10.1051/JPHYSCOL:19842179
Abstract: An automated electron microprobe, equipped with an energy-dispersive X-ray spectrometer and an additional backscattered electron signal digitalization system, can allow rapid sizing and major element analysis on numerous particles. A software package has been developed to exploit the particle size and shape information to achieve quantitative analysis of single particles, and to compare the performance of the different matrix correction procedures.
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
DOI: 10.1051/JPHYSCOL:19842179
|
|
|
|
“LAMMA and electron-microprobe analysis of atmospheric aerosols”. Bruynseels F, Storms H, Van Grieken R, Journal de physique 45, 785 (1984). http://doi.org/10.1051/JPHYSCOL:19842180
Abstract: A laser microprobe mass analyser and a highly automated electron probe X-ray microanalysis unit have been used to study the elemental composition, inorganic speciation and morphology of atmospheric aerosols collected at various remote to polluted and marine to continental locations.
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
DOI: 10.1051/JPHYSCOL:19842180
|
|
|
|
“Doped albumin : stndardization possibilities for LAMMA-analysis of thin freeze-dried cryosections of biological tissue”. Verbueken AH, Jacob WA, Frederik PM, Busing WM, Hersten RC, Van Grieken RE, Journal de physique 45, 561 (1984)
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
|
|
