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  1. No Access

    Article

    Multi-Modal "Order-Order" Kinetics in Ni3Al Studied by Monte Carlo Computer Simulation

    "Order-order" relaxations in γ'-Ni3Al previously extensively studied by means of resistometry, are simulated within a model of vacancy mechanism of atomic migration in a superstructure implemented with Monte Carl...

    P. Oramus, R. Kozubski, V. Pierron-Bohnes, M.C. Cadeville… in MRS Online Proceedings Library (2000)

  2. No Access

    Article

    Structural origin of magnetic anisotropy in Co-Pt alloy films probed by polarized XAFS

    Polarized X-ray absorption fine structure (XAFS) measurements at the Co K and Pt L3 edges show that the perpendicular magnetic anisotropy found in epitaxial fcc CoPt3 (111) films stems from the existence of aniso...

    C. Meneghini, M. Maret, V. Parasote… in The European Physical Journal B - Condense… (1999)

  3. No Access

    Article

    Chemical Ordering Along the Growth Direction in Epitaxial [0002] Co1−xRux Alloy Thin Films

    The occurrence of metastable long range order (LRO) along the growth direction with a periodicity twice that of a disordered alloy is now a well established result in epitaxial hcp [0002] Co-Ru and Co-Pt alloy...

    O. Ersen, L. Bouzidi, V. Pierron-Bohnes, M. C. Cadeville in MRS Online Proceedings Library (1998)

  4. No Access

    Article

    Respective Roles of Surface, Grain Boundary and Volume Diffusions in Driving Structural, Microstructural and Magnetic Properties of MBE Alloy Thin Films

    The co-deposition of two metals using a molecular beam epitaxy (MBE) technique at various growth temperatures (TG) yields single-crystal alloy thin films with a columnar microstructure whose structural and magnet...

    V. Pierron-Bohnes, M. Maret, L. Bouzidi, M. C. Cadeville in MRS Online Proceedings Library (1998)

  5. No Access

    Article

    Mechanism of “Order-Order” Kinetics in Ll2 Superstructure Studied by Computer Simulation

    Monte Carlo simulations of the isothermal long-range order (LRO) relaxation in A3B system with Ll2 superstructure have been performed within a model based on a vacancy jump mechanism between nearest neighbour lat...

    P. Oramus, R. Kozubski, M. C. Cadeville… in MRS Online Proceedings Library (1998)

  6. No Access

    Article

    Structural properties of molecular beam epitaxy grown Ni/Pt superlattices

    We find that the [Ni3.2nmPt1.6nm] × 15 and [Ni3.2nmPt0.8nm] × 15 multilayers are semicoherent and display a columnar morphology. From both the period of the moir’e fringes and the positions of the diffraction pea...

    W. Staiger, A. Michel, V. Pierron-Bohnes, N. Hermann… in Journal of Materials Research (1997)

  7. No Access

    Chapter

    CVM and inverse CVM: Examples in Transition-Metal Alloys and Compounds

    Some applications of the Cluster Variation Method (CVM) in analysing or interpreting experimental results are presented and discussed. The first example is the experimental determination of the effective pair ...

    M. C. Cadeville, V. Pierron-Bohnes… in Theory and Applications of the Cluster Var… (1996)

  8. No Access

    Article

    Plan-view microstructures of Co/Ru bilayers

    Plan-view microstructures of two Co/Ru bilayers with a composition of [Co12ÅRu45Å]2 and [Co40ÅRu35Å]2 have been studied by conventional and high resolution electron microscopy. Large differences in electron diffr...

    G. Z. Pan, A. Michel, V. Pierron-Bohnes, P. Vennéguès… in Journal of Materials Research (1995)

  9. No Access

    Article

    Monte Carlo simulations of long-range order kinetics in B2 phases

    The thermodynamic parameters that drive the atomic migration in B2 alloys are studied using Monte-Carlo simulations. The model is based on a vacancy jump mechanism between nearest neighbor sites, with a consta...

    K. Yaldram, V. Pierron-Bohnes, M. C. Cadeville, M. A. Khan in Journal of Materials Research (1995)

  10. No Access

    Chapter

    Long-Range Ordering Kinetics in Ni3Al-Based Alloys with Various Ordering Energies

    According to theoretical models, the value of ordering energy determining the “order-disorder” transition temperature Tt should affect the kinetics of long-range ordering (LRO). The kinetics of L12 ordering was s...

    R. Kozubski, J. Soltys, M. C. Cadeville… in Ordering and Disordering in Alloys (1992)

  11. No Access

    Chapter

    Ordering Kinetics in Superalloy Type Intermetallic Compounds in Relation with Diffusion Mechanisms

    The investigation of ordering-ordering kinetics (LRO or SRO) in inter-metallic compounds yields informations on the activation energy of the ordering process that can be compared to the energy of the interdiff...

    M. C. Cadeville, V. Pierron-Bohnes, R. Kozubski in Ordering and Disordering in Alloys (1992)

  12. No Access

    Chapter

    Effect of Long Range Ordering on the Magnetic and Electronic Properties of Some Transition Metal Based Alloys

    This paper presents a short overview of the effect of long-range ordering on the magnetic and electronic properties of fcc Ni-Pt and Co-Pt and of bcc Fe-Al. The first part is a summary of experimental data. The s...

    M. C. Cadeville, J. M. Sanchez… in Structural and Phase Stability of Alloys (1992)

  13. No Access

    Article

    Kinetics of SRO and LRO in FeAl Alloys with A2 and DO3 Structures

    The kinetics of short and long-range ordering in FeA1x alloys have been investigated using resistometry. The results were obtained in the A2 solid solution (x = 0.10 and 0.17), in the DO3 ordered phase (x = 0.23,...

    M. C. Cadeville, V. Pierron-Bohnes, P. Vennegues… in MRS Online Proceedings Library (1990)

  14. No Access

    Article

    High Temperature Measurements of Neutron Diffuse Scattering in a FeAll9.5at% Single Crystal. Influence of Magnetism on Chemical Order.

    The influence of magnetism on atomic short range order is shown in a single crystalline FeAl19.sat% alloy in the disordered phase. The short range order has been measured in the paramagnetic state between 973 and...

    V. Pierron-Bohnes, M. C. Cadeville, O. upSchaerpf… in MRS Online Proceedings Library (1990)

  15. No Access

    Article

    Magnetic and Chemical Ordering in the NiPt and the CoPt Systems

    The interplay between atomic ordering and magnetism in the NiPt and theCoPt systems is investigated theoretically and experimentally. The complete equilibrium phase diagrams are calculated within the framework of...

    J. M. Sanchez, J. L. Morán-López, M. C. Cadeville in MRS Online Proceedings Library (1990)

  16. No Access

    Article

    Evidence of a Correlation between the Transition Temperature for Ordering and the Activation Energy for Ordering Kinetics in Ni75Al25-xFex Superalloys

    Kinetics of long-range ordering was studied in the alloys Ni75Al25-xFex by means of in situ resistometry. The alloys under consideration exhibit a dramatic decrease of the “order-disorder” transition temperature ...

    R. Kozubski, J. Soltys, M. C. Cadeville… in MRS Online Proceedings Library (1990)

  17. No Access

    Article

    CVM Simulation of the Resistivity in L10 and L12 Co-Pt Intermetallic Compounds

    The contributions of the atomic and spin disorder to the resistivity of two intermetallic Co1-x Ptx (x=0.5 and 0.7) compounds have been previously determined from experimental studies and separated from the phono...

    J.M. Sanchez, M.C. Cadeville, V. Pierron-Bohnes in MRS Online Proceedings Library (1990)

  18. No Access

    Chapter and Conference Paper

    Kinetics of Order-Disorder Phenomena in Some Intermetallic Platinum-Based Alloys

    We present a brief report on studies of the atomic mobility and of the order-disorder (0-D) transformation mechanism in some alloys belonging to Ni-Pt and Co-Pt systems. A prior section is devoted to kinetics ...

    M. C. Cadeville, C. Leroux… in Atomic Transport and Defects in Metals by … (1986)

  19. No Access

    Chapter and Conference Paper

    High T-Dependence of Local Order in Magnetic FeM Alloys from Neutron Diffuse Scattering

    We present in this paper the first “in situ” at high temperature investigation of the atomic short-range order (SRO) T-dependence in magnetic alloys by neutron diffuse scattering (NDS). Up to now analogous exp...

    V. Pierron-Bohnes, M. C. Cadeville in Atomic Transport and Defects in Metals by … (1986)

  20. No Access

    Article

    Evidence of a Coupling between Magnetic and Chemical Interactions in Iron-Based Alloys

    The simultaneous occurrence of chemical and magnetic interactions in transition metal alloys greatly influences their thermodynamic properties. However the experimental evidence of the Coupling between both in...

    V. Pierron-Bohnes, M. C. Cadeville, F. Gautier in MRS Online Proceedings Library (1983)