The effects of vacancies on diffusion of interstitial and substitutional atoms as well as interaction between them in metals were discussed.In the interstitial alloy,a coupling between interstitial atoms and vacancy i...The effects of vacancies on diffusion of interstitial and substitutional atoms as well as interaction between them in metals were discussed.In the interstitial alloy,a coupling between interstitial atoms and vacancy is interrelated through the reaction of formation and dissociation of complex.For substitutional alloy with |E_b|<kT,if the atom diffusion is of the vacancies exchange mechanism,the vacancies may considerably affect atom diffusion.Based on the micromechanism of diffusion in these two alloys,their diffusion equations under general condition may be obtained,and the second Fick' s law is only an approximate form when neg- lecting vacancy influence.展开更多
文摘The effects of vacancies on diffusion of interstitial and substitutional atoms as well as interaction between them in metals were discussed.In the interstitial alloy,a coupling between interstitial atoms and vacancy is interrelated through the reaction of formation and dissociation of complex.For substitutional alloy with |E_b|<kT,if the atom diffusion is of the vacancies exchange mechanism,the vacancies may considerably affect atom diffusion.Based on the micromechanism of diffusion in these two alloys,their diffusion equations under general condition may be obtained,and the second Fick' s law is only an approximate form when neg- lecting vacancy influence.
