Solute atom migration in GH4169 superalloy under electrostatic fields  

作　　者：Yao Wang Lei Wang Yang Liu Xiu Song Bei-jiang Zhang Jin-hui Du 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials,Northeastern University [2]Department of High-temperature Materials,Central Iron and Steel Research Institute

出　　处：《International Journal of Minerals,Metallurgy and Materials》2013年第12期1176-1182,共7页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.51171039);the Major State Basic Research Development Program of China (No.2010CB631203)

摘　　要：Electric field treatment （EFT） was applied on GH4169 alloy during aging at 500-800℃ to investigate the microstructure and property variation of the alloy under the action of EFT. The results demonstrate that the shortdistance diffusion of Al, Ti, and Nb atoms can be accelerated by EFT, which results in the coarsening of γ′and γ＂ phases. Meanwhile, lattice distortion can be caused by the segregation of Fe and Cr atoms, owing to the vacancy flows migrating toward the charged surfaces of the alloy. Therefore, the alloy is hardened by the application of EFT, even if the strength of the alloy is partly reduced, which is caused by precipitation coarsening.Electric field treatment （EFT） was applied on GH4169 alloy during aging at 500-800℃ to investigate the microstructure and property variation of the alloy under the action of EFT. The results demonstrate that the shortdistance diffusion of Al, Ti, and Nb atoms can be accelerated by EFT, which results in the coarsening of γ′and γ＂ phases. Meanwhile, lattice distortion can be caused by the segregation of Fe and Cr atoms, owing to the vacancy flows migrating toward the charged surfaces of the alloy. Therefore, the alloy is hardened by the application of EFT, even if the strength of the alloy is partly reduced, which is caused by precipitation coarsening.

关 键 词：SUPERALLOYS nickel alloys electric fields AGING PRECIPITATION VACANCIES 

分 类 号：TG132.32[一般工业技术—材料科学与工程]