Zn/Cu反应扩散系数的影响因素

Factors Affecting Zn/Cu Reaction Diffusion Coefficient

研究了460℃时Zn(液)/Cu(固)扩散偶反应扩散。利用金相显微镜、能谱仪EDS和Zn/Cu平衡相图分析研究了所出现的新相。通过非平衡态扩散边界条件,导出了各单相反应扩散系数的计算方程,并对其影响因素进行了分析研究。结果表明:各相之间反应扩散系数有较大不同,且远大于Arrhenius方程计算的扩散系数。反应扩散系数的主要影响因素是各单相相变反应速率,同时单相边界浓度和扩散时间对反应扩散系数也有一定影响。

Reaction diffusion studies in the zinc - copper diffusion couples are investigated at the temperature of 460 ℃ in this paper. With using metallographic microscope,energy dispersive spectrum （EDS） and Zn/Cu binary alloy phase diagrams the new phases emerged from reaction diffusion was studied. On the basis of the diffusion boundary conditions of non -equilibrium, the single -phase reaction diffusion coefficients calculation equation is deduced, and its influencing factors are studied. The results show that ： the reaction diffusion coefficient between each phase much different, and all the diffusion coefficient quite greater than the by Arrhenius equation calculated. The major influencing factors of reaction diffusion coefficient is the reaction rate of each single - phase transformation, meanwhile the single - phase boundary concentration and reaction diffusion time affect on reaction diffusion coefficient in a certain degree.