Imperial College London

DrBaptisteGault

Faculty of EngineeringDepartment of Materials

Reader in Materials
 
 
 
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b.gault

 
 
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Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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251 results found

He J, Scholz F, Horst OM, Thome P, Frenzel J, Eggeler G, Gault Bet al., 2020, On the rhenium segregation at the low angle grain boundary in a single crystal Ni-base superalloy, Scripta Materialia, Vol: 185, Pages: 88-93, ISSN: 1359-6462

© 2020 Acta Materialia Inc. Industrial scale single crystal (SX) Ni-base superalloys contain numerous low angle grain boundaries inherited from the solidification process. Here, we demonstrate that low angle grain boundaries in a fully heat-treated SX model Ni-base superalloy are strongly segregated with up to 12 at% Re. Some Re-rich dislocations forming this grain boundary are found located inside γ, others close to a γ/γ′ interface. Although these segregated Re atoms lose their solid-solution strengthening effect, they may enhance the creep resistance by pinning the low angle grain boundaries and slowing down dislocation reactions.

Journal article

Palanisamy D, Ener S, Maccari F, Schaefer L, Skokov KP, Gutfleisch O, Raabe D, Gault Bet al., 2020, Grain boundary segregation, phase formation, and their influence on the coercivity of rapidly solidified SmFe11Ti hard magnetic alloys, PHYSICAL REVIEW MATERIALS, Vol: 4, ISSN: 2475-9953

Journal article

Schweinar K, Kim S-H, Lim J, Scheu C, Raabe D, Kasian O, Gault Bet al., 2020, New Frontiers in Electrocatalyst Characterization – Three Dimensional Atomic-Scale Insights By Atom Probe Tomography, ECS Meeting Abstracts, Vol: MA2020-01, Pages: 2561-2561

Journal article

El-Zoka AA, Schweinar K, da Silva AK, Raabe D, Gault Bet al., 2020, Prospects of Making Nanoporous Ruthenium from Transition Metal-Ru Alloys, ECS Meeting Abstracts, Vol: MA2020-01, Pages: 2713-2713

Journal article

Schweinar K, Gault B, Greiner M, Raabe D, Kasian Oet al., 2020, Atomic-Scale View into the Degradation of Ir-Ru Alloys during Anodic Oxygen Evolution, ECS Meeting Abstracts, Vol: MA2020-01, Pages: 1520-1520

Journal article

Kasian O, Schweinar K, Li T, Mayrhofer KJJ, Gault Bet al., 2020, Tuning Fundamental Properties of Ir-Based Materials to Enhance Their Electrocatalytic Performance in the Oxygen Evolution Reaction, ECS Meeting Abstracts, Vol: MA2020-01, Pages: 1557-1557

Journal article

Cheng G-J, Lilensten L, Huang C-Y, Gault B, Yen H-Wet al., 2020, Nanoscale compositional fluctuations enabled by dynamic strain-induced austenite reversion in a Mn-rich duplex steel, SCRIPTA MATERIALIA, Vol: 181, Pages: 101-107, ISSN: 1359-6462

Journal article

Zhao H, Chen Y, Gault B, Makineni SK, Ponge D, Raabe Det al., 2020, (Al, Zn)<inf>3</inf>Zr dispersoids assisted η′ precipitation in anAl-Zn-Mg-Cu-Zr alloy, Materialia, Vol: 10

© 2020 The influence of (Al,Zn)3Zr dispersoids on the precipitation of the main strengthening (Mg,Zn)-rich phases was investigated during isothermal aging of a model Al-Zn-Mg-Cu-Zr alloy. Upon homogenization of the alloy, dispersoids of (Al,Zn)3Zr with a L12 structure are present. Isothermal aging at 120 °C for 0.5 h leads to the homogeneous formation of spherical GP zones in the α-Al matrix and heterogeneous nucleation on (Al,Zn)3Zr dispersoids. After 2 h of aging, GP zones remain present in the α-Al matrix while the accelerated transformation of GP zones to plate-shaped (Mg,Zn)-rich ηʹ precipitates is shown on the {111} planes at the interface of the L12 dispersoids. Even at grain boundaries, the similar composite structure comprising ηʹ precipitates on the coarser Zr-dispersoid is observed, along with 10-nm wide precipitate-free zones around them. The composition and structure of pre-existing dispersoids, their role in the formation of the composite structure are discussed.

Journal article

Massey CP, Edmondson PD, Unocic KA, Yang Y, Dryepondt SN, Kini A, Gault B, Terrani KA, Zinkle SJet al., 2020, The effect of Zr on precipitation in oxide dispersion strengthened FeCrAl alloys, Journal of Nuclear Materials, Vol: 533, ISSN: 0022-3115

© 2020 Elsevier B.V. Oxide dispersion strengthened (ODS) FeCrAl alloys are promising candidate materials for advanced nuclear reactor applications requiring high-temperature strength, corrosion resistance, and irradiation tolerance. As these alloys have increased in compositional complexity through attempts to use highly reactive elements such as Zr to refine particle sizes and optimize nanoprecipitate dispersion characteristics, much debate has ensued as to the effects of these alloying element additions on alloy properties. In an attempt to reconcile differences in nanoprecipitate distributions reported in the literature over the past decade, a detailed investigation of a recently developed ODS FeCrAl alloy with nominal composition Fe–10Cr-6.1Al-0.3Zr+0.3Y2O3 is presented using a combination of atom probe tomography (APT), scanning/transmission electron microscopy (S/TEM), and computational thermodynamics modeling. It is illustrated that based on the amount of Zr available in the lattice, Zr competes with Al and Cr to form carbides and nitrides as opposed to oxygen-rich precipitates. This alloy system has a high number density (>1023 m−3) of ∼2–4 nm diameter (Y,Al,O)-rich nanoprecipitates, but it is shown that due to the compositional spread and unknown partitioning of Al between the matrix and precipitates, significant challenges still exist for quantifying the exact compositions of these precipitates using APT. However, the noted compositional spread is supported by identified complex oxides yttrium aluminum monoclinic (YAM) and yttrium aluminum garnet (YAG) using S/TEM. As a result of these findings, researchers developing ODS FeCrAl with reactive element additions must pay careful attention to C and N impurities when optimizing reactive element additions.

Journal article

Sohn SS, Kim DG, Jo YH, da Silva AK, Lu W, Breen AJ, Gault B, Ponge Det al., 2020, High-rate superplasticity in an equiatomic medium-entropy VCoNi alloy enabled through dynamic recrystallization of a duplex microstructure of ordered phases, Acta Materialia, ISSN: 1359-6454

Journal article

Evertz S, Schnabel V, Koehler M, Kirchlechner I, Kontis P, Chen Y-T, Soler R, Jaya BN, Kirchlechner C, Music D, Gault B, Schneider JM, Raabe D, Dehm Get al., 2020, Review on Quantum Mechanically Guided Design of Ultra-Strong Metallic Glasses, FRONTIERS IN MATERIALS, Vol: 7, ISSN: 2296-8016

Journal article

Cervellon A, Hemery S, Kuernsteiner P, Gault B, Kontis P, Cormier Jet al., 2020, Crack initiation mechanisms during very high cycle fatigue of Ni-based single crystal superalloys at high temperature, ACTA MATERIALIA, Vol: 188, Pages: 131-144, ISSN: 1359-6454

Journal article

De Geuser F, Gault B, 2020, Metrology of small particles and solute clusters by atom probe tomography, ACTA MATERIALIA, Vol: 188, Pages: 406-415, ISSN: 1359-6454

Journal article

Breen AJ, Stephenson LT, Sun B, Li Y, Kasian O, Raabe D, Herbig M, Gault Bet al., 2020, Solute hydrogen and deuterium observed at the near atomic scale in high-strength steel, ACTA MATERIALIA, Vol: 188, Pages: 108-120, ISSN: 1359-6454

Journal article

Jenkins BM, Danoix F, Goune M, Bagot PAJ, Peng Z, Moody MP, Gault Bet al., 2020, Reflections on the Analysis of Interfaces and Grain Boundaries by Atom Probe Tomography, Publisher: CAMBRIDGE UNIV PRESS

Working paper

Lim J, Kim S, Aymerich Armengol R, Kasian O, Choi P, Stephenson LT, Gault B, Scheu Cet al., 2020, Atomic‐Scale Mapping of Impurities in Partially Reduced Hollow TiO 2 Nanowires, Angewandte Chemie, Vol: 132, Pages: 5700-5704, ISSN: 0044-8249

Journal article

Lim J, Kim S-H, Armengol R, Kasian O, Choi P-P, Stephenson LT, Gault B, Scheu Cet al., 2020, Atomic-Scale Mapping of Impurities in Partially Reduced Hollow TiO2 Nanowires, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 59, Pages: 5651-5655, ISSN: 1433-7851

Journal article

Friedrichs M, Peng Z, Grunwald T, Rohwerder M, Gault B, Bergs Tet al., 2020, PtIr protective coating system for precision glass molding tools: Design, evaluation and mechanism of degradation, SURFACE & COATINGS TECHNOLOGY, Vol: 385, ISSN: 0257-8972

Journal article

Zhao H, Huber L, Lu W, Peter NJ, An D, De Geuser F, Dehm G, Ponge D, Neugebauer J, Gault B, Raabe Det al., 2020, Interplay of Chemistry and Faceting at Grain Boundaries in a Model Al Alloy, PHYSICAL REVIEW LETTERS, Vol: 124, ISSN: 0031-9007

Journal article

Chang Y, Zhang S, Liebscher CH, Dye D, Ponge D, Scheu C, Dehm G, Raabe D, Gault B, Lu Wet al., 2020, Could face-centered cubic titanium in cold-rolled commercially-pure titanium only be a Ti-hydride?, Publisher: PERGAMON-ELSEVIER SCIENCE LTD

Working paper

Kuernsteiner P, Bajaj P, Gupta A, Wilms MB, Weisheit A, Li X, Leinenbach C, Gault B, Jaegle EA, Raabe Det al., 2020, Control of thermally stable core-shell nano-precipitates in additively manufactured Al-Sc-Zr alloys, ADDITIVE MANUFACTURING, Vol: 32, ISSN: 2214-8604

Journal article

Wang X, Hatzoglou C, Sneed B, Fan Z, Guo W, Jin K, Chen D, Bei H, Wang Y, Weber WJ, Zhang Y, Gault B, More KL, Vurpillot F, Poplawsky JDet al., 2020, Interpreting nanovoids in atom probe tomography data for accurate local compositional measurements, NATURE COMMUNICATIONS, Vol: 11, ISSN: 2041-1723

Journal article

Wu X, Makineni SK, Liebscher CH, Dehm G, Mianroodi JR, Shanthraj P, Svendsen B, Bürger D, Eggeler G, Raabe D, Gault Bet al., 2020, Publisher Correction: Unveiling the Re effect in Ni-based single crystal superalloys., Nat Commun, Vol: 11

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Journal article

Scherrer B, Li T, Tsyganok A, Döbeli M, Gupta B, Malviya KD, Kasian O, Maman N, Gault B, Grave DA, Mehlman A, Visoly-Fisher I, Raabe D, Rothschild Aet al., 2020, Defect Segregation and Its Effect on the Photoelectrochemical Properties of Ti-Doped Hematite Photoanodes for Solar Water Splitting, Chemistry of Materials, Vol: 32, Pages: 1031-1040, ISSN: 0897-4756

Copyright © 2019 American Chemical Society. Optimizing the photoelectrochemical performance of hematite photoanodes for solar water splitting requires better understanding of the relationships between dopant distribution, structural defects, and photoelectrochemical properties. Here, we use complementary characterization techniques including electron microscopy, conductive atomic force microscopy (CAFM), Rutherford backscattering spectroscopy (RBS), atom probe tomography (APT), and intensity-modulated photocurrent spectroscopy (IMPS) to study this correlation in Ti-doped (1 cat. %) hematite films deposited by pulsed laser deposition (PLD) on F:SnO2 (FTO)-coated glass substrates. The deposition was carried out at 300 °C followed by annealing at 500 °C for 2 h. Upon annealing, Ti was observed by APT to segregate to the hematite/FTO interface and into some hematite grains. Since no other pronounced changes in microstructure and chemical composition were observed by electron microscopy and RBS after annealing, a nonuniform Ti redistribution seems to be the reason for reduced interfacial recombination in the annealed films, as observed by IMPS. This results in a lower onset potential, higher photocurrent, and larger fill factor with respect to the as-deposited state. This work provides atomic-scale insights into the microscopic inhomogeneity in Ti-doped hematite thin films and the role of defect segregation in their electrical and photoelectrochemical properties.

Journal article

He J, Zenk CH, Zhou X, Neumeier S, Raabe D, Gault B, Makineni SKet al., 2020, On the atomic solute diffusional mechanisms during compressive creep deformation of a Co-Al-W-Ta single crystal superalloy, ACTA MATERIALIA, Vol: 184, Pages: 86-99, ISSN: 1359-6454

Journal article

Wu X, Makineni SK, Liebscher CH, Dehm G, Mianroodi JR, Shanthraj P, Svendsen B, Buerger D, Eggeler G, Raabe D, Gault Bet al., 2020, Unveiling the Re effect in Ni-based single crystal superalloys, NATURE COMMUNICATIONS, Vol: 11, ISSN: 2041-1723

Journal article

Rivas NA, Babayigit A, Conings B, Schwarz T, Sturm A, Manjon AG, Cojocaru-Miredin O, Gault B, Renner FUet al., 2020, Cryo-focused ion beam preparation of perovskite based solar cells for atom probe tomography, PLOS ONE, Vol: 15, ISSN: 1932-6203

Journal article

Evertz S, Kirchlechner I, Soler R, Kirchlechner C, Kontis P, Bednarcik J, Gault B, Dehm G, Raabe D, Schneider JMet al., 2020, Electronic structure based design of thin film metallic glasses with superior fracture toughness, MATERIALS & DESIGN, Vol: 186, ISSN: 0264-1275

Journal article

He J, Makineni SK, Lu W, Shang Y, Lu Z, Li Z, Gault Bet al., 2020, On the formation of hierarchical microstructure in a Mo-doped NiCoCr medium-entropy alloy with enhanced strength-ductility synergy, SCRIPTA MATERIALIA, Vol: 175, Pages: 1-6, ISSN: 1359-6462

Journal article

Kim S-H, Lim J, Sahu R, Kasian O, Stephenson LT, Scheu C, Gault Bet al., 2020, Direct Imaging of Dopant and Impurity Distributions in 2D MoS2, ADVANCED MATERIALS, Vol: 32, ISSN: 0935-9648

Journal article

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