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2 edition of stem study of grain boundary segregation in selected FCC binary alloys. found in the catalog.

stem study of grain boundary segregation in selected FCC binary alloys.

David C. Paine

stem study of grain boundary segregation in selected FCC binary alloys.

by David C. Paine

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  • 2 Currently reading

Published .
Written in English


The Physical Object
Pagination117 leaves
Number of Pages117
ID Numbers
Open LibraryOL16354951M

Grain Boundary Segregation in Phase Separating Nanocrystalline Alloys: The Role of Competing Processes on Microstructure Evolution.. United States. United States. Copy to clipboardAuthor: Fadi F. Abdeljawad, Stephen M. Foiles, Ping Lu, Blythe Clark. Segregation to grain boundaries, for example, can lead to grain boundary fracture as a result of temper brittleness, creep embrittlement, stress relief cracking of weldments, hydrogen embrittlement, environmentally assisted fatigue, grain boundary corrosion, and some kinds of intergranular stress corrosion cracking. A very interesting and important field of study of impurity segregation.

grain boundary and surface segregation in boron doped Ni3Al. INTRODUCTION The intermetallic alloy Ni3Al adopts the ordered Li2 crystal structure at temperatures up to its solidus. This structure is a variant of the face centered cubic structure, in which the Ni occupies the face centered sites.   T1 - Grain-boundary segregation in Al%Mg alloys at hot working temperatures. AU - Liu, X. Y. AU - Adams, James. PY - /6/ Y1 - /6/ N2 - Monte-Carlo simulations are done to determine Mg enrichment at various grain-boundaries of Al%Mg alloys at hot working by:

It results in the loss of grain boundary cohesion and consequently, in brittle fracture of the materials. The current book deals with fundamentals of grain boundary segregation in metallic materials and its relationship to the grain boundary structure, classification and other materials : Hardcover. Das, Nishith Kumar and Shoji, Tetsuo Early Stage Oxidation Initiation at Different Grain Boundaries of fcc Fe–Cr Binary Alloy: A Computational Chemistry Study. Oxidation of Metals, Vol. 79, Issue. , p. CrossRef; Google ScholarCited by: 3.


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Stem study of grain boundary segregation in selected FCC binary alloys by David C. Paine Download PDF EPUB FB2

In order to study RIS behavior as a function of grain boundary misorientation angle, it is necessary to describe the grain boundary absorption strength in terms of grain boundary misorientation angle.

A second case study can be conducted on Au-based alloys, for which a comprehensive and consistent set of tensile tests was done by Roberts-Austen in one of the first studies of grain boundary embrittlement, which found that while almost all semimetals and K caused grain boundary embrittlement of Au, no transition metal elements studied caused Cited by: Equilibrium grain boundary segregation of Sb in Cu-Sb alloys was studied by the methods of Auger and X-ray photoelectron spectroscopy.

On the base of Lungmuir-McLean isotherm, the atomic fraction. Equilibrium grain boundary segregation is assessed in terms of its measurement, theory and industrial significance. Aspects of the phenomenon of this segregation, namely the localisation, chemical system dependence, response to environmental parameters, etc, are discussed in relation to the measurement techniques for grain boundary by: Because grain boundaries form a continuous network throughout such materials, their properties may limit their practical use.

One of the serious phenomena which evoke these limitations is the grain boundary segregation of impurities. It results in the loss of grain boundary cohesion and consequently, in brittle fracture of the materials.

Introduction and motivation. Grain boundaries (GBs) are ubiquitous defects in metallic alloys governing a range of properties, such as tensile strength, fatigue resistance, fracture toughness, strain hardening, brittleness, conductivity, or corrosion.

Unlike bulk phases they are planar and require 5 parameters to be crystallographically characterized (disorientation, plane Cited by: Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys Michael A.

Gibson and Christopher A. Schuh * Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge MA 0 USA Contact Information: Michael A Gibson: [email protected], Cited by: Implementation Code Modifications.

To investigate the effects of a grain boundary in a binary alloy, a Monte Carlo (MC) simulation was run using two different codes, CLAMPS and, two codes, differ only in the way the potential energy is computed. Abstract. Results of experimental studies of grain-boundary segregation in binary alloys have been considered and analyzed.

The model of grain-boundary segregation and an isotherm that allows for the possibility of the formation of complexes in grain boundaries have been by: 2. A V.G. Microscopes' HB5 STEM has been used to study a segregated copper-bismuth alloy.

It is shown that the Z contrast mechanism due to Crewe ( a, b) is not valid for such crystalline materials. Attempts to use the energy loss spectrometer, with which the microscope is fitted, to detect the bismuth spectrum from the grain boundary region were not by:   Equilibrium grain boundary segregation levels have been measured on binary and ternary iron alloys with tin and sulphur over a wide temperature range, by means of two complementary techniques: interfacial energy measurements and Auger electron spectroscopy.

Segregation levels derived from the Gibbs adsorption theorem applied to solid/solid interfaces are fully consistent with Cited by: The paper studies deformation mechanisms of nanocrystalline (NC) pure Al and its binary alloys with various distributions of an alloying element which can be Co or Mg via molecular dynamics simulations.

It is revealed that a shear deformation of the pure Al is associated with the grain boundary sliding (GBS) and their simultaneous migration. Mg atoms in grain boundaries (GBs) of an Al-Mg alloy Cited by: 4. membranes Article Grain Boundary Segregation in Pd-Cu-Ag Alloys for High Permeability Hydrogen Separation Membranes Ole Martin Løvvik 1,*, Dongdong Zhao 2, Yanjun Li 2, Rune Bredesen 1 and Thijs Peters 1 1 SINTEF Industry, N Oslo, Norway; [email protected] (R.B.); @ (T.P.) 2 Department of Materials Science and Engineering, Norwegian Cited by: 2.

Abstract. Grain boundary (GB) and surface segregation have been researched by computer simulations in the so-called Cantor alloy: Co 20 Ni 20 Cr 20 Fe 20 Mn 20 20 Ni 20 Cr 20 Fe 20 Mn Grain boundary segregation engineering in metallic alloys: A pathway to the design of interfaces Current Opinion in Solid State and Materials Science 18 () Grain boundary segregation engineering in metallic alloys: A pathway to the design of interfaces D.

Raabe, M. Herbig, S. Sandlöbes, Y. Li, D. Tytko, M. Kuzmina, D. Ponge, P.-P. Grain boundary segregation Extending the crystal placticity model [] to investigate how grain pairs interact will increase our understanding of how deformation traverses interfaces.

In the general case for bcc and fcc metals we hope to be able to calculate how the angle between the interfacial plane orientation and the stress axis influences. of grain boundary segregation and migration is provided in Chap.

Chapter 7 is devoted to the discussion of the consequences of grain boundary segregation for selected physicochemical properties and metallurgical phenomena.

I deeply believethat this File Size: 2MB. Equilibrium grain boundary segregation is assessed in terms of its measurement, theory and industrial significance. Aspects of the phenomenon of this segregation, namely the localisation, chemical system dependence, response to environmental parameters, etc., are discussed in relation to the measurement techniques for grain boundary by:   The case study material was deposited as a nm thick Fe-8 at.% Cr film by co-magnetron sputtering from at.% pure elemental Fe and Cited by: on grain boundary segregation and thermodynamics, the distribution of the segregant at the boundary and the changes in the grain boundary structure due to segregation.

Simulations based upon the LH model (described below) will be performed on ten different [] twist boundaries in Cu-Ni alloys for tem. The hot forming of Fe–Ni alloys such as Invar (Fe–36Ni) is often limited by grain boundary fracture. 1,2) Grain boundary fracture is generally caused by segregation of S and/or precipitation of nitrides, carbides and sulfides at grain boundaries.

It has been shown that very low S concentration (~ a few 10 mass-ppm) is enough to cause hot ductility loss. 1,2) However, since S segregation at Cited by: 1. Segregation-induced ordered superstructures at general grain boundaries in a Ni-Bi alloy The discovery of ordered, segregation-induced superstructures .For a given composition, there is an equilibrium grain size, and the alloy configuration in equilibrium generally involves solute segregation.

The present approach reduces to a standard model of grain boundary segregation in the limit of infinite grain size, but substantially generalizes prior thermodynamic models for nanoscale alloy systems.