1,721,121 research outputs found
A New Method for Mapping the 3D Atomic Distribution within Nanoparticles by Atom Probe Tomography (APT)
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Understanding the detection of carbon in austenitic high-Mn steel using atom probe tomography
No full textA high-Mn TWIP steel having composition Fe-22Mn-0.6C (wt%) is considered in this study, where the need for accurate and quantitative analysis of clustering and short-range ordering by atom probe analysis requires a better understanding of the detection of carbon in this system. Experimental measurements reveal that a high percentage of carbon atoms are detected as molecular ion species and on multiple hit events, which is discussed with respect to issues such as optimal experimental parameters, correlated field evaporation and directional walk/migration of carbon atoms at the surface of the specimen tip during analysis. These phenomena impact the compositional and spatial accuracy of the atom probe measurement and thus require careful consideration for further cluster-finding analysis. (C) 2013 Elsevier B.V. All rights reserve
Investigation of sputter-deposited Al-2at.%Cu layers by means of the tomographic atom probe (TAP)
No full textSputter-deposited Al-2at.%Cu layers have been investigated with respect to their microstructure and the spatial distribution of the elements using the tomographic atom probe. Al grains show columnar shape in the as-sputtered state, where the matrix is supersaturated with Cu. Upon annealing at temperatures between 150 and 350 degrees C, a significant decrease in the average Cu concentration is measured within the grains. Neither second phase formation within the Al matrix nor Cu enrichment at the surface or at the layer/ substrate interface have been detected, suggesting segregation of Cu atoms in Al grain boundaries. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
3D Printing of NbCoSn Half-Heusler Thermoelectric Material with Ultra-Low Thermal Conductivity by Introducing Nano Powder and Nano-Pulse Laser
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