Nanostructural temporal evolution and solute partitioning in model Ni-based superalloys containing ruthenium, rhenium, and tungsten

被引：0

作者：

Isheim, Dieter ^{[1
]}

Hsieh, Gillian ^{[1
]}

Noebe, Ronald D. ^{[1
]}

Seidman, David N. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

Solid-Solid Phase Transformations in Inorganic Materials 2005, Vol 1 | 2005年

关键词：

nickel-based superalloy; ruthenium; rhenium; tungsten; coarsening; transmission electron microscopy; atom-probe tomography;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Transmission electron microscopy (TEM) and atom-probe tomography (APT) are employed to study the growth and coarsening kinetics of gamma'-precipitates and the solute partitioning behavior in a series of model superalloys based on a Ni-8.5Cr-10Al at.% composition with Ru, Ru-Re, or Ru-Re-W additions, during isothermal aging at 800 degrees C up to 256 h. Substituting Ru for Ni is found to retard the growth and coarsening kinetics of the gamma'-precipitates; Re and W additions decrease the coarsening rate constant further by all order of magnitude. The exponent of the temporal power law for the precipitate radius is n = (3.3 +/- 0.1) and the time exponent for the number density is m = (-0.82 +/- 0.06) for all three alloys, independent of coherency strain energy differences between the three alloys. The aluminum concentration in the gamma'-precipitates is found to decrease continuously with aging time. which is consistent with a nucleation and growth precipitation process.

引用

页码：309 / 314

页数：6

共 15 条

[1] LATE-STAGE PHASE-SEPARATION - DYNAMICS, SPATIAL CORRELATIONS, AND STRUCTURE FUNCTIONS [J].