Investigating the Role of Grain Boundaries in Interface Reactions

1994 ◽  
Vol 343 ◽  
Author(s):  
FranÇois M d'Heurle ◽  
Patrick Gas ◽  
Jean Philibert
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Review Of The Literature ◽  
Phase Growth ◽  
Metal Interactions ◽  
Interface Reactions ◽  
Metal Metal ◽  
Kinetics Of ◽  
Short Section

ABSTRACTThe paper is built around a nonexhaustive review of the literature on the role of grain boundaries in reactive phase formation. Examples are chosen to illustrate these effects in silicide and oxide growths, and later on in metal-metal interactions. A short section deals with the effect of grain boundaries and grain boundary adsorption of impurities on the kinetics of growth and on the morphology of the growing layer. Some attempts at understanding the mechanisms of phase growth from the tracking of isotopes are briefly analyzed.

Inhomogeneous Swelling Near Grain Boundaries in Irradiated Materials: Cavity Nucleation and Growth Saturation Effects

2000 ◽  
Vol 650 ◽  
Author(s):  
S. L. Dudarev
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Nucleation And Growth ◽  
Homogeneous Distribution ◽  
Rate Theory ◽  
Diffusional Growth ◽  
Standard Rate ◽  
Saturation Effects ◽  
Kinetics Of ◽  
Cascade Damage

ABSTRACTThe effect of inhomogeneous nucleation and growth of cavities near grain boundaries illustrates the failure of the standard rate theory to describe the kinetics of phase transformations in irradiated materials under cascade damage conditions. The enhanced swelling observed near grain boundaries is believed to result from the competition between the diffusional growth of cavities and their shrinkage due to the interaction with mobile interstitial clusters. Swelling rates associated with the two processes behave in a radically different way as a function of the size of growing cavities. For a spatially homogeneous distribution of cavities this gives rise to the saturation of swelling in the limit of large irradiation doses.We investigate the evolution of the population of cavities nucleating and growing near a planar grain boundary. We show that a cavity growing near the boundary is able to reach a size that is substantially larger than the size of a cavity growing in the interior region of the grain. For a planar grain boundary the magnitude of swelling at maximum is found to be up to eight times higher than the magnitude of swelling in the grain interior.

Formation of Ag2, Au2 and AgAu particles on MgO(100): DFT study on the role of support-induced charge transfer in metal–metal interactions

2009 ◽  
Vol 255 (16) ◽  
pp. 7380-7384 ◽  
Author(s):  
Silvia A. Fuente ◽  
Patricia G. Belelli ◽  
María M. Branda ◽  
Ricardo M. Ferullo ◽  
Norberto J. Castellani
Keyword(s):  
Charge Transfer ◽  
Dft Study ◽  
Metal Interactions ◽  
Metal Metal ◽  
Induced Charge

Hierarchical Structured Nanomaterial Fabricated by Nanopowder Process: Nanopowder Agglomerate Sintering

2010 ◽  
Vol 638-642 ◽  
pp. 93-97 ◽  
Author(s):  
Jai Sung Lee ◽  
W. K. You ◽  
B. H. Cha
Keyword(s):  
Optimal Design ◽  
Grain Boundary ◽  
Structure Design ◽  
Full Density ◽  
Pressureless Sintering ◽  
Material Transport ◽  
Interface Structures ◽  
Kinetics Of

The key concept of nanopowder agglomerate sintering (NAS) process is based on the optimization of structure design and full density processing of nanopowder into nanostructured micro-components. The kinetics of NAS process is characteristic of being controlled by material transport through hierarchical interface structures of nanopowder agglomerates. Through optimal design of those hierarchical interfaces such as nano grain boundary and agglomerate boundary, thus, full density nanopowder materials can be fabricated by pressureless sintering. In this paper we overview recent studies on the role of hierarchical interfaces for processing of full density nanopowder materials.

Mechanisms of ductility improvement in L12 compounds

1988 ◽  
Vol 3 (3) ◽  
pp. 426-440 ◽  
Author(s):  
Osamu Izumi ◽  
Takayuki Takasugi
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Intermetallic Compounds ◽  
Present Article ◽  
Electronic Structures ◽  
Alloying Effect ◽  
Test Environment ◽  
Materials Development

The present article first describes some characteristics of structure, chemistry, and electronic (bond) nature for grain boundaries in the A3B Li2-type intermetallic compounds. Next, the phenomenological aspects for the grain boundary brittleness of the Li2-type intermetallic compounds are reviewed with respect to the combination of the constituent atoms, the alloying effect, the stoichiometry effect, and a role of impurity or gaseous atoms. It is emphasized that the brittleness of grain boundaries in the intermetallic compounds is directly controlled by the atomistic and electronic structures at grain boundary regions. Based on these systematic investigations, it is suggested that the brittleness of the Li2-type intermetallic compounds can be manipulated by appropriate control of composition and the corresponding electrochemical bond environment at grain boundary planes and by control of test environment. Furthermore, some examples of the materials development are described.

Keep it tight: a crucial role of bridging phosphine ligands in the design and optical properties of multinuclear coinage metal complexes

2021 ◽  
Author(s):  
Aleksandra V. Paderina ◽  
Igor O Koshevoy ◽  
Elena V. Grachova
Keyword(s):  
Optical Properties ◽  
Metal Complexes ◽  
Crucial Role ◽  
Phosphine Ligands ◽  
Bridging Ligands ◽  
Coinage Metal ◽  
Metal Interactions ◽  
Metal Metal ◽  
State 1

The copper subgroup metal ions in the oxidation state +1 are classical candidates for the aggregation via non-covalent metal–metal interactions, which are supported by a number of the bridging ligands....

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