Modeling Interdiffusion Processes in CMSX-10/Ni Diffusion Couple

被引：26

作者：

Chyrkin, A. ^{[1
]}

Epishin, A. ^{[2
]}

Pillai, R. ^{[1
]}

Link, T. ^{[2
]}

Nolze, G. ^{[3
]}

Quadakkers, W. J. ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Energy & Climate Res IEK 2, Leo Brandt Str, D-52425 Julich, Germany

[2] Tech Univ Berlin, Ernst Reuter Pl 1, D-10587 Berlin, Germany

[3] BAM Fed Inst Mat Res & Testing, Unter Eichen 87, D-12205 Berlin, Germany

来源：

JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION | 2016年 / 37卷 / 02期

关键词：

chemical potential; chemical potential gradients; composition profiles; DICTRA modeling; diffusion; diffusion modeling; electron probe microanalysis (EPMA); SQUARE-ROOT DIFFUSIVITY; FINITE-DIFFERENCE MODEL; DESCRIBING CARBURIZATION; REFRACTORY ELEMENTS; AL; OXIDATION; PHASE; RE; SIMULATION; PROFILES;

D O I：

10.1007/s11669-015-0444-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A diffusion couple between directionally solidified nickel and the single crystal Ni-base superalloy CMSX-10 was produced by hot pressing in vacuum. The diffusion couples were heat treated at temperatures between 1050 and 1250 A degrees C. The exposed samples were characterized by SEM/EBSD/EPMA. The interdiffusion results in dissolution of the gamma'-Ni3Al in the superalloy and in growth of nickel grains towards CMSX-10. Rapid diffusion of aluminum from the superalloy into pure nickel leads to a significant formation of pores in the superalloy. The interdiffusion processes were modelled using the finite-element simulation software DICTRA with the databases TCNi5 and MobNi2, tailored specially for Ni-base superalloys. The effect of alloying elements on the interdiffusion profiles is discussed in terms of alloy thermodynamics. The calculated element concentration profiles are in good agreement with the EPMA measurements. The interdiffusion modeling correctly predicts the shapes of the concentration profiles, e.g. kinks on the Al and Ti profiles in the vicinity of the original interface in the joint. The calculation predicts with reasonable accuracy the extent and the location of the Kirkendall porosity.

引用

页码：201 / 211

页数：11

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