Term
|
Definition
| This is the phenomenon of material transport by atomic motion. |
|
|
Term
|
Definition
| This is how diffusion takes place; by joining bars of two different metals together so that there is intimate contact between the two faces. |
|
|
Term
| Interdiffusion / Impurity Diffusion |
|
Definition
| The process whereby atoms of one metal diffuse into another |
|
|
Term
|
Definition
| Diffusion occurs for pure metals but all atoms exchanging positions are of the same type |
|
|
Term
|
Definition
| One mechanism involves the interchange of an atom from a normal lattice position to an adjacent lattice site or vacancy. |
|
|
Term
|
Definition
| Host or substitutional impurity atoms rarely form interstitials and do not normally diffuse via this mechanism. |
|
|
Term
|
Definition
| Rate of Mass Transfer; (J) defined as the mass of equivalent, the number of atoms |
|
|
Term
|
Definition
| If the diffusion flux does not change with time, a steady-state condition exits. |
|
|
Term
|
Definition
| When concentration C is plotted versus position (or distance) within the solid x, the resulting curve is this. |
|
|
Term
|
Definition
| The slope at a particular point on this curve (concentration profile) |
|
|
Term
|
Definition
| The Constant of proportionality D this is expressed in square meters per second. |
|
|
Term
| Diffusion Flux (equation) or Fick's first law |
|
Definition
|
|
Term
|
Definition
| This is used in the context of what compels a reaction to occur. According to the Fick's first law. |
|
|
Term
| What is the driving force in Fick's first law? |
|
Definition
| The Concentration gradient |
|
|
