100 ③0od Befo diffusion +6◎ 0 Cu Ni 90000 100 ng ②○000 diffusion 0 100 o0◎ After diffusion Is completed 0 Distance Distance
2 Interstitial mechanism to be effective for diffusion in interstitial sol sol 3. Vacancy mechanism Atoms jump directly in to nearby vacant site, AG being small Different kind of atoms has different( chemical) affinity for vacancy Motion of atom Motion of vacancy (a)Vacancy mechanism (b)Interstitial mechanism
2. Interstitial mechanism to be effective for diffusion in interstitial sol.sol. 3. Vacancy mechanism. Atoms jump directly in to nearby vacant site, being small. Different kind of atoms has different (chemical) affinity for vacancy. G
Motion of a host substitutional atom Position of interstitial Position of interstitial atom before diffusion atom after diffusion oo③③③