ATOMIC STRUCTURE OF GRAIN BOUNDARIES AND INTERGRANULAR SEGREGATION

Atomic Structure of Grain Boundaries and Intergranular Segregation

— Some Important aspects of the atomic structure of grain boundaries in pure metals, in particular the structural model of general grain boundaries and the multiplicity of structures, are discussed first. An empirical scheme for the desciption of atomic interactions in alloys is then outlined. General, structure independent, properties of segregation are examined in the framework of this scheme...

Diffraction Studies of the Atomic Structure of Grain Boundaries

The recent results of the application of diffraction techniques to study the atomic structure of grain boundaries are reviewed. The outcome of the first determination of a grain boundary structure using diffraction information alone is examined. The influence of a particular metal on the grain boundary structure is examined. The variation of grain boundary structural width with parameters such ...

Anisotropy of Segregation at Grain Boundaries and Surfaces

The purpose of this article is to review analytical models of the anisotropy of segregation to grain boundaries (GBs) and surfaces, and to evaluate their predictions. A summary of Gibbsian interfacial thermodynamics is provided as an introduction to the topic. This is followed by a historical overview of previous analytical models. A recently developed model of the dependence of GB segregation ...

Atomic structures and oxygen dynamics of CeO2 grain boundaries

Material performance is significantly governed by grain boundaries (GBs), a typical crystal defects inside, which often exhibit unique properties due to the structural and chemical inhomogeneity. Here, it is reported direct atomic scale evidence that oxygen vacancies formed in the GBs can modify the local surface oxygen dynamics in CeO2, a key material for fuel cells. The atomic structures and ...

Segregation of Interstitial Impurities at Grain Boundaries in Transition Metals