Atomic Transport and Defects in Metals by Neutron Scattering

The Institut Max-von-Laue-Paul Langevin (ILL) in Grenoble regularly organ­ ises workshops that deal with the various applications of neutrons in physics, chemistry, biology and also in nuclear physics. The workshop" Atomic Trans­ port and Defects in Metals by Neutron Scattering", jointly organised by the Institut Laue-Langevin and the Institut fiir Festkorperforschung of the KFA­ Jiilich, was held in October 1985 in Jiilich. The study of problems in metal physics and in physical metallurgy is a traditional field of neutron scattering. The most commonly used methods are diffuse elastic, small-angle and inelastic scattering of neutrons. A number of problems can be identified where neutrons yield information that is supple­ mentary to that from other methods such as x-ray diffraction, synchrotron radiation or electron microscopy. In certain fields, for example spectroscopy for the investigation of atomic motions or for the investigation of magnetic properties, neutron scattering is a unique method. The facilities at the High Flux Reactor of the ILL, and also at the Jiilich and at other medium flux research reactors, have contributed numerous re­ sults in these fields. It was the aim of this workshop to give a survey of the present state of neutron scattering in metal physics.

Inhalt

Introductory Lecture. A Comparison of Neutrons and Synchrotron Radiation for Defect Studies.- I Short Range Order.- Monte Carlo Simulation of Alloy Phase Diagrams and Short-Range Order.- The Determination of Atomic Interaction Energies in Solid Solutions from Short Range Order Coefficients - An Inverse Monte Carlo Method.- Short-Range Order and Atomic Interaction in NiCrx.- High T-Dependence of Local Order in Magnetic FeM Alloys from Neutron Diffuse Scattering.- Short-Range Order in a Ni63.7 Zr36.3 Amorphous Alloy. Effects of Structural Relaxation.- A SANS Approach to Possible Hierarchical Structures of Defects in Amorphous Alloys.- SANS Measurements on Metallic Glasses and the Contributions of Nuclear and Magnetic Structure Defects and of the External Surfaces.- Short-Range Order in Metallic Glasses.- II Precipitation and Growth; Time-Dependent Experiments.- Phase Separation in Alloys Using Low Q Neutron Scattering.- SANS-Investigation of Early Stage Precipitation Kinetics in Cu-2.9 at.% Ti.- Phase Transformations in Fe-Cu-Alloys - SANS-Experiments and Theory.- Kinetics of Order-Disorder Phenomena in Some Intermetallic Platinum-Based Alloys.- Studies of Heterogeneities of Micrometer-Range with Double Crystal Diffractometer.- Decomposition Kinetics in the Superalloy Nimonic PE16 and the System NiAlTi Investigated by TEM, FIM and SANS.- Comparative TEM, FIM and SANS Study of the Cu-2 at.% Co Decomposition.- Quantitative Measurement of Anomalous Small-Angle X-Ray Scattering (ASAXS) in Some Al-Zn-Ag Alloys.- III Hydrogen in Metals.- Interstitial Point Defects (D,N,O) in Transition Metals.- Coherent Quasi-Elastic Scattering of Neutrons from Lattice Gas Systems.- Mechanism of Hydrogen Diffusion in Intermetallic Hydrides.- Hydrogen Diffusion in Amorphous Liquid-Quenched PdxSi1-x Hy Measured by QNS.- IV Diffusion in Alloys and Hydrogen in Metals.- Quasielastic Neutron Scattering Study of Fast Diffusion of Co in ?-Zr.- Systematic Investigation of Self-Correlation Functions in Cubic Lattices; Mono- and Divacancy Mechanisms.- Quasielastic Coherent Scattering for Atomic Diffusion via Vacancies.- Lattice Dynamics and Interstitial Motion.- Interatomic Forces Near a Hydrogen Impurity in Metals.- H Tunneling and Local Diffusion in NbOxHy.- Jahn-Teller Relaxation Effects in the Inelastic Neutron Scattering Spectra of Hydrogen Metal Systems.- Localized Vibrations of Hydrogen in Metals.- One-, Two- and Three-Dimensional Disorder of D-Atoms in Non-Stoichiometric TaDx.- Neutron Radiography Studies of Spinodal Decomposition in NbHx.- V Point Defects, Radiation Damage, Voids, and Bubbles.- Irradiation Damage in Metals: A Story of But Also's.- Determination of Helium Densities in Bubbles Using a Contrast Variation Method.- Studies of Stress- and Fatigue-Induced Defects Using Small-Angle Neutron Scattering.- Neutrons in Practical Metallurgy.- Point Defects in Metals in Thermal Equilibrium.- Saturation of Irradiation-Induced Precipitation.- Analysis of Defect Microstructures in Irradiated Ferritic Alloys.- Influence of Electron Irradiation on Decomposition Kinetics and Morphology in CuNiFe Alloys.- Index of Contributors.