Diffusion processes in multicomponent nickel-base superalloy-nickel system
Diffusion processes in multicomponent nickel-base superalloy-nickel system
复制标题
DOI：
10.1134/s0031918x14010050
复制
发表时间：
2014-01-01
影响因子：
1.2
通讯作者：
Oder, G.
中科院分区：
文献类型：
--
作者：
Epishin, A. I.;Link, T.;Oder, G.
光学和扫描电子显微镜，以及电子探针分析和电子背散射衍射，已被用来研究扩散过程中发生的扩散对，由单晶CMSX-10镍基高温合金和多晶镍，在1050- 1250摄氏度的温度。已经发现，在这个系统中，γ稳定元素（Cr，Co，W和Re）的分布描述的两个半无限板的二元合金之间的扩散的玻尔兹曼解决方案。这些分布的处理表明，Cr，Co，W和Re在多组分系统中的扩散系数接近于这些元素与Ni的二元合金中的扩散系数。元素的扩散再分布导致镍基高温合金中γ '相的溶解、镍晶粒向扩散对的高温合金组分的生长以及在迁移界面两侧上孔隙的形成，这由合金单晶和镍晶粒的晶体取向差确定。
Optical and scanning electron microscopy, as well as electron microprobe analysis and electron backscatter diffraction, have been used to study diffusion processes that occur in a diffusion pair that consistsof a single-crystal CMSX-10 nickel-base superalloy and polycrystalline nickel, at temperatures of 1050-1250A degrees C. It has been found that, in this system, the distributions of gamma-stabilizing elements (Cr, Co, W, and Re) are described by the Boltzmann solution for diffusion between two semiinfinite plates of a binary alloy. The processing of these distributions has shown that the diffusion coefficients of Cr, Co, W, and Re in the multicomponent system are close to those in binary alloys of these elements with Ni. The diffusion redistribution of the elements leads to the dissolution of the gamma' phase in the nickel-base superalloy, growth of nickel grains toward the superalloy constituent of the diffusion pair, and the formation of porosity on both sides of the migrating interface, which is determined from a crystal misorientation of the alloy single crystal and nickel grains.