Direct determination of grain‐boundary and dislocation self‐diffusion coefficients in silver from experiments in type‐C kinetics

1992 ◽  
Vol 72 (7) ◽  
pp. 2758-2766 ◽  
Author(s):  
J. Sommer ◽  
Chr. Herzig
Keyword(s):  
Grain Boundary ◽  
Diffusion Coefficients ◽  
Direct Determination ◽  
Self Diffusion ◽  
Type C

Direct determination of the self-diffusion mechanism in bccβ-titanium

1989 ◽  
Vol 39 (8) ◽  
pp. 5025-5034 ◽  
Author(s):  
G. Vogl ◽  
W. Petry ◽  
Th. Flottmann ◽  
A. Heiming
Keyword(s):  
Diffusion Mechanism ◽  
Direct Determination ◽  
The Self ◽  
Self Diffusion

Rapid and Direct Determination of Diffusion Coefficients Using Microelectrode Arrays

2016 ◽  
Vol 163 (8) ◽  
pp. H672-H678 ◽  
Author(s):  
Jonathan Moldenhauer ◽  
Madeline Meier ◽  
David W. Paul
Keyword(s):  
Diffusion Coefficients ◽  
Microelectrode Arrays ◽  
Direct Determination

The influence of phosphorus in dilute solid solution on the absolute surface and grain boundary energies of iron

1965 ◽  
Vol 286 (1407) ◽  
pp. 479-498 ◽  
Keyword(s):  
Solid Solution ◽  
Grain Boundary ◽  
Phosphorus Content ◽  
Diffusion Creep ◽  
Self Diffusion ◽  
Thin Foils ◽  
The Absolute ◽  
Contractile Forces

A technique has been developed for the determination of the absolute surface energies of iron and iron alloys at temperatures of up to the melting point. The technique is based upon the measurement of the contractile forces in thin foils. All measurements are made in situ and chemical equilibrium is maintained throughout the experiment. The results show that phosphorus in dilute solid solution decreases progressively the surface energy of iron at 1450 °C from 2100 ergs cm -2 to 1200 ergs cm -2 , for increasing phosphorus contents of up to 0.36%. Results were also obtained for the γ phase in which the effect is less pronounced. Absolute grain boundary energies were also determined as a function of phosphorus content. From the strain rate of the foils which move by a diffusion creep mechanism, it was deduced that the self diffusion coefficient increases linearly with phosphorus content. Application of the Gibbs adsorption theorem has permitted the evaluation of the extents of equilibrium segregation of the solute to interfaces. The maximum levels are 2.3 x 10 -9 g-atom cm -2 at surfaces and 1.1 x 10 -9 g-atom cm -2 at grain boundaries. The relevance of these measurements to the problem of the intergranular brittle fracture of iron/phosphorus alloys is discussed.

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