Effects of Si Solid Solution in Fe Substrate on the Alloying Reaction between Fe Substrate and Liquid Zn

摘要

Effects of Si solid solution in Fe substrate on the formation of Fe-Zn intermetallic phase layers between the Fe(-Si) substrate and liquid Zn were investigated using a combinatorial technique. The formation of ζ-FeZn_(13) layer was promoted by Si solid solution up to 2 at.% in the Fe substrate but retarded by further solution. The formation of δ_1-FeZn_(7-10) phase and Γ-Fe_3Zn_(10) phase was retarded by Si solid solution up to 10 at.%. The rate of Fe dissolution from the Fe substrate to the liquid Zn region and the Fe/Zn/Si contents in the δ_1 phase were analyzed as a function of Si content in the substrate. The results obtained suggest that the retardation of the Fe-Zn phase formation is caused by a difficulty in the nucleation of δ_1 phase at lower Si contents less than 3 at.% and by a decrease in the rate of Fe dissolution at higher Si contents.