2014 | |
Articles: | |
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Journal of Applied Physics,
116:093504
2014
DOI: 10.1063/1.4894616
Equipe: Département SI2M : Microstructures et Contraintes |
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Journal of Applied Crystallography,
47:181-187
2014
Equipe: Département SI2M : Microstructures et Contraintes |
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Inorganic Chemistry,
53 (1):147-159
2014
Equipe: Département SI2M : Microstructures et Contraintes |
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Applied Surface Science,
306:70--74
2014
ISSN: 0169-4332
Equipe: Département SI2M : Microstructures et Contraintes |
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Materials Characterization,
98:193-201
2014
ISSN: 1044-5803
Equipe: Département SI2M : Microstructures et Contraintes |
2013 | |
Articles: | |
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Material Science and Engineering A,
561:477--485
2013
Equipe: Département SI2M : Microstructures et Contraintes |
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Thin Solid Films,
530:25-29
2013
Equipe: Département SI2M : Microstructures et Contraintes |
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Acta Materialia,
61:5067--5077
2013
Equipe: Département SI2M : Microstructures et Contraintes |
2012 | |
Articles: | |
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Micron,
43(2-3):396-406
2012
ISSN: 0968-4328
Resume: In single-crystal nickel-based superalloys, the lattice mismatch associated with interface coherency between gamma matrix and gamma' precipitates has a strong influence on mechanical properties. The unconstrained lattice misfit in a single-crystal of the MC2 nickel-based superalloy is determined using convergent beam electron diffraction measurements and finite element calculations. The apparent lattice parameters of both constrained phases are obtained in thin foils, using a new multi-pattern approach, which allows for unambiguous determination of all the lattice parameters considering the real symmetry of the strained crystals. Finite element calculations are used to establish relations between the constrained and unconstrained lattice parameters, with the stress relaxation resulting from the thin foil geometry taken into account. (C) 2011 Elsevier Ltd. All rights reserved. Equipe: Département SI2M : Microstructures et Contraintes |
2011 | |
Articles: | |
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Solid State Phenomena,
172-174(Part 1):493-498
2011
ISSN: 1012-0394
Resume: Superaustenitic stainless steels exhibit excellent corrosion resistance, at a wide variety of exposure temperatures, especially in chloride containing environments, coupled with desirable mechanical properties. Previous studies have shown that these steels are prone to precipitation of secondary phases, such as sigma phase (sigma), chi phase (chi). Laves-phase, carbides, nitrides or secondary austenite, when exposed at elevated temperatures, directly affecting their mechanical properties and corrosion behaviour. A detailed study of the effect of isothermal ageing on the microstructure of S32654 (Fe-24Cr-21Ni-7Mo-0.5N-0.013C) and S31254 (Fe-20Cr-18Ni-6Mo-0.2N-0.012C) superaustenitic stainless steels was carried out. Samples were aged within the temperature range of 650 degrees C to 950 degrees C for times up to 3000 h. Following ageing, precipitation of secondary phases was clearly observed with precipitates varying in volume fraction, size, shape and spatial distribution. Several secondary phases were identified via transmission electron microscopy (TEM) and electron diffraction (ED). The orientation relationships between the austenitic matrix and the secondary phases were identified. Interaction and also phase transformation among different types of precipitates, such as between precipitates and the austenitic matrix were observed and an attempt of understanding these phase transformations was carried out. Equipe: Département SI2M : Microstructures et Contraintes |