Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and 4th generation

被引：144
作者：
Matuszewski, K. [1 ]
Rettig, R. [1 ]
Matysiak, H. [4 ]
Peng, Z. [2 ]
Povstugar, I. [2 ]
Choi, P. [2 ]
Mueller, J. [3 ]
Raabe, D. [2 ]
Spiecker, E. [3 ]
Kurzydlowski, K. J. [4 ]
Singer, R. F. [1 ]
机构：
[1] Univ Erlangen Nuremberg FAU, Dept Mat Sci & Engn, Inst Sci & Technol Met WTM, D-91058 Erlangen, Germany
[2] Max Planck Inst Eisenforsch GmbH, Dept Microstruct Phys & Alloy Design, D-40237 Dusseldorf, Germany
[3] Univ Erlangen Nuremberg FAU, Dept Mat Sci & Engn, Ctr Nanoanal & Electron Microscopy, D-91058 Erlangen, Germany
[4] Warsaw Univ Technol, Fac Mat Sci & Engn, Mat Design Div, PL-02507 Warsaw, Poland
来源：
ACTA MATERIALIA | 2015年 / 95卷
关键词：
Topologically close packed (TCP) phases; Ni-based superalloys; Precipitation; Ruthenium effect; Thermodynamics; SINGLE-CRYSTAL SUPERALLOYS; RHENIUM; STABILITY; RU; 1100-DEGREES-C; RE;
D O I：
10.1016/j.actamat.2015.05.033
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The precipitation of topologically close packed (TCP) phases is detrimental for the high temperature strength of high refractory Ni-based superalloys. The beneficial influence of Ru with respect to this so called instability is nowadays well accepted. In the present paper the precipitation of topologically close packed (TCP) phases is studied quantitatively in two experimental alloys (one Ru-free and one with addition of Ru) to clarify the mechanism of the Ru effect. It is confirmed that the TCP phase precipitates undergo sequential phase transformation with the tetragonal sigma-phase precipitating first. Ru retards the phase transformation and leads to decreased equilibrium volume fraction of TCP phases. The results clearly indicate that Ru decreases the driving force for TCP phase precipitation. Investigations of crystallography and chemistry of the TCP/matrix interface point to an additional effect by increase of misfit strain energy. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：274 / 283
页数：10
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