Definitions of Terms for Diffusion in the Solid State

Abstract

Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgement, with full reference to the source along with use of the copyright symbol ᭧, the name IUPAC and the year of publication are prominently visible. Publication of a translation into another language is subject to the additional condition of prior approval from the relevant IUPAC National Adhering Organization. Unauthenticated Download Date | 6/25/16 7:26 AM Definitions of terms for diffusion in the solid state (IUPAC Recommendations 1999)Abstract: This document provides definitions of terms and processes which are used in describing the migration of host and foreign species through solid materials. Both the phenomenological theory of diffusion and the detailed atomistic mechanisms by which atom transport occurs are treated. Also included are the various types of gradients such as electrical, chemical, thermal and mechanical, which provide the driving forces for diffusion.

N and C Interstitial Diffusion and Thermodynamic Interactions in $$\varepsilon $$-Iron Carbonitride

“…Often, they are drawn by superposition on an isothermal section of the phase diagram of the considered system. [17,[37][38][39] procedure provided by the software Olympus Stream. This measurement process involved manual selection of the surface and the sublayer boundaries.…”

Microstructural development and crystallographic properties of decomposing Fe–N–C compound layers

“…In growing compound layers, the phase constitution as af unction of depthc an be predicted usingt he concept of diffusion paths [16][17][18][19]: the evolution of the (laterally averaged) composition as afunction of depth yields the diffusion path. If local equilibrium at each point of the diffusion path and thus at each depthi nt he specimen separately,p revails, this then also holds at the solid-solid interphaseboundaries in the compound layer and at the interface with the substrate.…”

The $$\upalpha +\upvarepsilon $$ Two-Phase Equilibrium in the Fe-N-C System: Experimental Investigations and Thermodynamic Calculations

“…However, it can be assumed [12] that at each depth below the surface local equilibrium with respect to the local, lateral gross composition, the temperature, and the pressure is established, especially at the interfaces between the Fe-N-C solid-solution phases, i.e., the sublayer boundaries and the interface with the substrate. The phase constitution as a function of depth can be predicted using the concept of diffusion paths: [13][14][15][16] the evolution of the (laterally averaged) composition as a function of depth allows to plot these composition data in a phase diagram at the temperature (and pressure) concerned, which data together constitute the diffusion path. If local equilibrium at each point of the diffusion path and thus at each depth in the specimen separately prevails, the sequence of the phases developing within the compound layer and the diffusion path can be related with the corresponding phase diagram, [13][14][15] e.g., see Reference 12.…”