Effective Vacancy Diffusion In Nial Binary Alloy

We considered three di erent types of mechanisms by which a vacancy di uses: nextrnnearest neighbor(NNN) jumps, triple defect mechanism and two variants of six-jumpsrncycles([110] and [100] bent directions). This is investigated by considering the vacancyrndi usion as motion of a Brownian particle in a potential eld. We used the migrationrnenergy pro le for the three types of mechanisms simulated by Kristen et al [1] to evaluaternthe e ective vacancy di usion coe cient at two high temperature values. We have foundrnthat their e ective vacancy di usion coe cient depends on migration energy and temperaturernfor the three vacancy di usion mechanisms. We compared the e ective vacancyrndi usion coe cient for the three vacancy di usion mechanisms and identi ed that therntriple defect path is the fastest than the other two di usion mechanisms

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