Kirchheim, Reiner

[["dc.bibliographiccitation.firstpage","4473"],["dc.bibliographiccitation.issue","16"],["dc.bibliographiccitation.journal","Acta Materialia"],["dc.bibliographiccitation.lastpage","4481"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Choi, P."],["dc.contributor.author","da Silva, M."],["dc.contributor.author","Klement, U."],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Kirchheim, Reiner"],["dc.date.accessioned","2018-11-07T10:55:49Z"],["dc.date.available","2018-11-07T10:55:49Z"],["dc.date.issued","2005"],["dc.description.abstract","Nanocrystalline Co-1.lat.%P prepared by pulsed electrodeposition was investigated with respect to thermal stability. Several characterization methods such as differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, field ion microscopy and tomographic atom probe were applied. Between 673 and 733 K, the allotropic phase transformation (hcp-Co to fcc-Co) sets in and abnormal grain growth is observed. It is suggested that there is a synergistic effect between abnormal grain growth and the allotropic phase transformation. Between 733 and 753 K, the P excess of the grain boundaries decreases, CO2P and CoP precipitates form, and normal grain growth occurs. Thus, the P-segregation to the grain boundaries is held responsible for the increased thermal stability of Co-1.lat.%P at temperatures below 753 K. The thermal stability of this alloy can be mainly attributed to the reduction of grain-boundary energy. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.actamat.2005.06.006"],["dc.identifier.isi","000231793700017"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49873"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","1359-6454"],["dc.title","Thermal stability of electrodeposited nanocrystalline Co-1.1at.%P"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","719"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Ultramicroscopy"],["dc.bibliographiccitation.lastpage","724"],["dc.bibliographiccitation.volume","111"],["dc.contributor.author","Rademacher, Thomas"],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Deges, Johannes"],["dc.contributor.author","Kirchheim, Reiner"],["dc.date.accessioned","2018-11-07T08:56:16Z"],["dc.date.available","2018-11-07T08:56:16Z"],["dc.date.issued","2011"],["dc.description.abstract","Addition of ternary elements to the D0(3) ordered Fe3Al intermetallic phase is a general approach to optimise its mechanical properties. To understand the physical influences of such additions the determination of the probability of site occupancies of these additions on the lattice site and ordering parameters is of high interest. Some common experimental techniques such as X-ray diffraction or Atom Location by Channelling Enhanced Microanalysis (ALCHEMI) are usually applied to explore this interplay. Unfortunately, certain published results are partly inconsistent, imprecise or even contradictory. In this study, these aspects are evaluated systematically by atom probe tomography (APT) and a special data analysis method. Additionally, to account for possible field evaporation effects that can falsify the estimation of site occupancy and induce misinterpretations, APT evaporation sequences were also simulated. As a result, chromium occupies most frequently the next nearest neighbour sites of Al atoms and local ordering parameters could be achieved. (C) 2010 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","DFG - Deutsche Forschungs Gemeinschaft [DFG-Az.: AL 592/3-1]"],["dc.identifier.doi","10.1016/j.ultramic.2010.12.009"],["dc.identifier.isi","000300460900063"],["dc.identifier.pmid","21247699"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23100"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.eventend","2010-07-08"],["dc.relation.eventlocation","Sydney, AUSTRALIA"],["dc.relation.eventstart","2010-07-05"],["dc.relation.issn","1879-2723"],["dc.relation.issn","0304-3991"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Ordering and site occupancy of D0(3) ordered Fe3Al-5 at%Cr evaluated by means of atom probe tomography"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","45"],["dc.bibliographiccitation.journal","Micron"],["dc.bibliographiccitation.lastpage","51"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Kompatscher, M."],["dc.contributor.author","Kirchheim, Reiner"],["dc.contributor.author","Kostorz, G."],["dc.contributor.author","Schoenfeld, B."],["dc.date.accessioned","2018-11-07T09:36:22Z"],["dc.date.available","2018-11-07T09:36:22Z"],["dc.date.issued","2014"],["dc.description.abstract","The decomposition behavior of Ni-rich Ni-Ti was reassessed using Tomographic Atom Probe (TAP) and Laser Assisted Wide Angle Tomographic Atom Probe. Single crystalline specimens of Ni-11.3 at.% Ti were investigated, the states selected from the decomposition path were the metastable gamma ' and gamma' states introduced on the basis of small-angle neutron scattering (SANS) and the two-phase model for evaluation. The composition values of the precipitates in these states could not be confirmed by APT data as the interface of the ordered precipitates may not be neglected. The present results rather suggest to apply a three-phase model for the interpretation of SANS measurements, in which the width of the interface remains nearly unchanged and the L1(2) structure close to 3:1 stoichiometry is maintained in the core of the precipitates from the gamma ' to the gamma' state. (C) 2014 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","Swiss National Science Foundation; KAUST"],["dc.identifier.doi","10.1016/j.micron.2014.04.004"],["dc.identifier.isi","000339142900008"],["dc.identifier.pmid","24981213"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32604"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0968-4328"],["dc.title","Phase decomposition and ordering in Ni-11.3 at.% Ti studied with atom probe tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","S872"],["dc.bibliographiccitation.journal","Journal of Alloys and Compounds"],["dc.bibliographiccitation.lastpage","S876"],["dc.bibliographiccitation.volume","509"],["dc.contributor.author","Gemma, Ryota"],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Kirchheim, Reiner"],["dc.contributor.author","Pundt, Astrid"],["dc.date.accessioned","2018-11-07T08:52:06Z"],["dc.date.available","2018-11-07T08:52:06Z"],["dc.date.issued","2011"],["dc.description.abstract","V-Fe5at.% 2 and 10-nm thick single layered films were prepared by ion beam sputtering on W substrate. They were loaded with D from gas phase at 0.2 Pa and at 1 Pa, respectively. Both lateral and depth D distribution of these films was investigated in detail by atom probe tomography. The results of analysis are in good agreement between the average deuterium concentration and the value, expected from electromotive force measurement on a similar flat film. An enrichment of deuterium at the V/W interface was observed for both films. The origin of this D-accumulation was discussed in respect to electron transfer, mechanical stress and misfit dislocations. (C) 2010 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jallcom.2010.11.122"],["dc.identifier.isi","000295695500081"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22090"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Sa"],["dc.publisher.place","Lausanne"],["dc.relation.conference","12th International Symposium on Metal-Hydrogen Systems, Fundamentals and Applications (MH2010)"],["dc.relation.eventend","2010-07-23"],["dc.relation.eventlocation","Moscow, Russia"],["dc.relation.eventstart","2010-07-19"],["dc.relation.issn","0925-8388"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Analysis of deuterium in V-Fe5at.% film by atom probe tomography (APT)"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","903"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Scripta Materialia"],["dc.bibliographiccitation.lastpage","906"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Gemma, Ryota"],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Kirchheim, Reiner"],["dc.contributor.author","Pundt, Astrid"],["dc.date.accessioned","2018-11-07T09:03:08Z"],["dc.date.available","2018-11-07T09:03:08Z"],["dc.date.issued","2012"],["dc.description.abstract","The first direct observation, by atom probe tomography, of a deuterium dead layer is reported for Fe/V multilayered film loaded with D solute atoms. The thickness of the dead layers was measured to be 0.4-0.5 nm. The dead layers could be distinguished from chemically intermixed layers. The results suggest that the dead layer effect occurs even near the interface of the mixing layers, supporting an interpretation that the dead layer effect cannot be explained solely by electronic charge transfer but also involves a modulation of rigidity. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.scriptamat.2012.08.025"],["dc.identifier.isi","000310390000009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24840"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","1359-6462"],["dc.title","Visualization of deuterium dead layer by atom probe tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","424"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Scripta Materialia"],["dc.bibliographiccitation.lastpage","427"],["dc.bibliographiccitation.volume","69"],["dc.contributor.author","Kresse, T."],["dc.contributor.author","Li, Y. J."],["dc.contributor.author","Boll, Torben"],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Choi, P."],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Raabe, Dierk"],["dc.contributor.author","Kirchheim, Reiner"],["dc.date.accessioned","2018-11-07T09:21:04Z"],["dc.date.available","2018-11-07T09:21:04Z"],["dc.date.issued","2013"],["dc.description.abstract","In patented and cold-drawn pearlitic steel wires dissociation of cementite occurs during mechanical deformation. In this study the influence of the carbon decomposition on the diffusion of nickel in ferrite is investigated by means of atom probe tomography. In the temperature range 423-523 K we observed a much smaller activation energy of Ni diffusion than for self-diffusion in body-centered cubic iron, indicating an increased vacancy density owing to enhanced formation of vacancy carbon complexes. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [SFB 602, TP B13]; KAUST baseline funds"],["dc.identifier.doi","10.1016/j.scriptamat.2013.05.039"],["dc.identifier.isi","000322416500021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29028"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1359-6462"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Influence of supersaturated carbon on the diffusion of Ni in ferrite determined by atom probe tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","802"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Ultramicroscopy"],["dc.bibliographiccitation.lastpage","807"],["dc.bibliographiccitation.volume","107"],["dc.contributor.author","Ene, Constantin-Buzau"],["dc.contributor.author","Schmitz, Guido"],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Kirchheim, Reiner"],["dc.date.accessioned","2018-11-07T10:59:29Z"],["dc.date.available","2018-11-07T10:59:29Z"],["dc.date.issued","2007"],["dc.description.abstract","Al/Cu/Al and Cu/Al/Cu triple layers with approximately 10 nm single layer thickness deposited on tungsten substrates were analyzed in the early stages of reactive interdiffusion by means of atom probe tomography. The first reaction product is found after 5 min thermal treatment at 110 degrees C and identified by direct chemical analysis to be Al2Cu. Surprisingly, we found a significant asymmetry in the reaction rate of the new phase with the stacking sequence: the thickness of the product grown at the interfaces, at which Cu is deposited on top of the Al layer, is approximately 1.5-2 times thicker than the other one at the interfaces at which Al is deposited onto a Cu layer. On the other hand, at both interfaces the thickness of the product layer depends parabolically on time. No precursory interdiffusion and no distinct nucleation process of the product are observed. (c) 2007 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.ultramic.2007.02.012"],["dc.identifier.isi","000247770100019"],["dc.identifier.pmid","17391847"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50709"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","Joint 50th International Field Emission Symposium/19th International Vacuum Nanoelectronics Conference"],["dc.relation.eventend","2006-07-20"],["dc.relation.eventlocation","Guilin, China"],["dc.relation.eventstart","2006-07-17"],["dc.relation.issn","0304-3991"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Solid state reaction in sandwich-type Al/Cu thin films"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","PII S0921-5093(01)01306-5"],["dc.bibliographiccitation.firstpage","168"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING"],["dc.bibliographiccitation.lastpage","173"],["dc.bibliographiccitation.volume","324"],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Kirchheim, Reiner"],["dc.date.accessioned","2018-11-07T10:31:56Z"],["dc.date.available","2018-11-07T10:31:56Z"],["dc.date.issued","2002"],["dc.description.abstract","Atom probe field-ion microscopy (APFIM) has been established as a sensitive analytical method for the investigation of the local chemical composition on nanometer scales. The adaptation and operation of a position sensitive detection system to the APFIM, named tomographic atom probe (TAP), improve substantially the quantitative character of analysis with this method. The TAP provides spatially resolved information on the position in real space and chemical nature of each collected atom of the sampled volume. The extended set of data collected by the TA-P can be treated with special visualizing tools. Three-dimensional images are created, which include all the information on microstructure and chemical composition of the sampled volume with atomic resolution. This paper demonstrates the capability of the TA-P to determine the decomposition parameters. Results on the phase decomposition in selected supersaturated alloys (Cu-Co, Al-Li and Ni-Be) are reviewed to gain an insight into the benefits and difficulties of this novel analytical method. (C) 2002 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S0921-5093(01)01306-5"],["dc.identifier.isi","000174084000030"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44228"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Sa"],["dc.publisher.place","Lausanne"],["dc.relation.conference","8th International Symposium on Physics of Materials"],["dc.relation.eventlocation","CHARLES UNIVERSITY, PRAGUE, CZECH REPUBLIC"],["dc.relation.issn","0921-5093"],["dc.title","Investigation of phase decomposition in alloys with the tomographic atom probe"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","599"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Ultramicroscopy"],["dc.bibliographiccitation.lastpage","605"],["dc.bibliographiccitation.volume","109"],["dc.contributor.author","Wille, Catharina G."],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Choi, Pyuck-Pa"],["dc.contributor.author","Kwon, Young-Soon"],["dc.contributor.author","Kirchheim, Reiner"],["dc.date.accessioned","2018-11-07T08:31:32Z"],["dc.date.available","2018-11-07T08:31:32Z"],["dc.date.issued","2009"],["dc.description.abstract","In this contribution the homogeneity of mechanically alloyed Fe-Cu powders for two different compositions (Fe-10 and Fe-2.5 at%Cu) has been systematically characterised by atom probe tomography. Since Fe-Cu exhibits the Invar effect, it is among the most attractive systems for technical application. Furthermore, this system is immiscible and characterised by a large positive heat of mixing. In combination with the widespread application and accessibility, this predestines Fe-Cu as a binary model alloy to elaborate the enforced nonequilibrium enhanced solubility for immiscible systems. Depending on the parameters composition and milling time, results on the extension of the solubility limit and on the homogeneity of the alloy are presented, discussed and compared to earlier works. Only for the alloy with lower Cu content and for the prolonged milling time of 50 h, chemical homogeneity of the sample as measured by the atom probe was fully reached on the nano-scale. For all other parameter combinations homogeneity could not be achieved, even for long milling times and for those samples that appear to be homogeneous via X-ray analysis. Moreover, impurities were determined, mostly stemming from the fabrication procedure. The arrangement and homogeneity of the most common impurity, oxygen, was evaluated from atom probe data for different samples. Thus, the local concentration, segregation effects and the distribution of impurities could be quantified on the nano-scale, depending on the different nominal compositions and processing parameters. Additionally, structural information could be gained employing transmission electron microscopy and diffraction measurements. (C) 2008 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.ultramic.2008.10.004"],["dc.identifier.isi","000265345500040"],["dc.identifier.pmid","19064309"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17142"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","51st International Field Emission Symposium"],["dc.relation.eventlocation","Rouen Univ, Mat Phys Grp, Rouen, FRANCE"],["dc.relation.issn","0304-3991"],["dc.title","An assessment of the homogeneity of nano-crystalline Fe-Cu powders as studied by means of APT"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","266"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Zeitschrift für Metallkunde"],["dc.bibliographiccitation.lastpage","271"],["dc.bibliographiccitation.volume","94"],["dc.contributor.author","Kirchheim, Reiner"],["dc.contributor.author","Pundt, Astrid"],["dc.contributor.author","Al-Kassab, Talaat"],["dc.contributor.author","Wang, F."],["dc.contributor.author","Kluthe, C."],["dc.date.accessioned","2018-11-07T10:40:52Z"],["dc.date.available","2018-11-07T10:40:52Z"],["dc.date.issued","2003"],["dc.description.abstract","Recent results are presented on the chemical composition of metal/oxide interfaces using the tomographic atom probe and small angle neutron scattering for both Pd/MgO and Ag/MgO interfaces. The amount of segregated oxygen and hydrogen at the interfaces is in agreement with a model of structural vacancies at dense-packed interface planes. Different to Ag-Mg internally oxidized Pd-Mg alloys swell during internal oxidation as well as during vacuum annealing above 400 degreesC and after the internal oxidation. This behavior is explained by the formation of water bubbles from excess oxygen and residual hydrogen."],["dc.identifier.isi","000220697600018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/46405"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Carl Hanser Verlag"],["dc.relation.issn","0044-3093"],["dc.title","Metal/oxide interfaces and their reaction with hydrogen"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]