Microstructure and local mechanical properties of Pt-modified nickel aluminides on nickel-base superalloys after thermo-mechanical fatigue

被引：37

作者：

Franke, Oliver ^{[1
]}

Durst, Karsten ^{[1
]}

Goeken, Mathias ^{[1
]}

机构：

[1] Univ Erlangen Nurnberg, Dept Mat Sci, Inst 1, Erlangen, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 467卷 / 1-2期

关键词：

nanoindentation; NiAl-diffusion coatings; Young's modulus; hardness; microstructure; thermo-mechanical fatigue;

D O I：

10.1016/j.msea.2007.02.069

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A single-phase and a two-phase platinum modified aluminide coating on the nickel-base superalloy CMSX-6 were investigated with analytical scanning electron microscopy (SEM) and nanoindentation in the as-coated condition and after thermo-mechanical fatigue loading (TMF). The microstructure of the single-phase coating exhibits high stability during TMF-loading and hardly any grain coarsening is observed. The grain size was determined by electron channelling contrast images (ECC) in the SEM to be 45.6 and 39.7 mu m, respectively. In the two-phase coating the PtAl2 second phase particles dissolve throughout TMF-loading causing a coarsening of the beta-NiAl grains from an original size of 5.5-18.5 mu m after TMF. The microstructural evolution is associated with a strong change in the local mechanical properties as determined by nanoindentation. It is found that Young's modulus as well as hardness decrease in both investigated systems. The change in local mechanical properties is related to the microstructural and chemical changes of the coating. As far as the beta-NiAl phase is concerned, the Al concentration is found to be the main reason for the decrease in Young's modulus. This behaviour was confirmed by nanoindentation measurements on a Ni-NiAl diffusion couple. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：15 / 23

页数：9

共 32 条

[11] Microstructural properties of superalloys investigated by nanoindentations in an atomic force microscope [J].

Göken, M ;

Kempf, M .

ACTA MATERIALIA, 1999, 47 (03) :1043-1052

[12]

GRUBE F, 2003, P 5 INT C LOW CYCL F

[13]

GRUBE F, 2002, 1428 ASTM STP

[14] Effects of Pt on the elastic properties of B2NiAl: A combined first-principles and experimental study [J].

Jiang, C. ;

Sordelet, D. J. ;

Gleeson, B. .

ACTA MATERIALIA, 2006, 54 (09) :2361-2369

[15] High-temperature deformation behavior of NiAl(Ti) solid-solution single crystals [J].

Kitabjian, PH ;

Garg, A ;

Noebe, RD ;

Nix, WD .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1999, 30 (03) :587-600

[16] OVERVIEW NO-104 - THE PHYSICAL AND MECHANICAL-PROPERTIES OF NIA1 [J].

MIRACLE, DB .

ACTA METALLURGICA ET MATERIALIA, 1993, 41 (03) :649-684

[17] Evolution of a PtAL2 coating on the nickel-base alloy CMSX-6 subjected to thermo-mechanical fatigue [J].

Moretto, P ;

Bressers, J ;

Arrell, DJ .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 272 (02) :310-320

[18] Application of the electron channeling contrast imaging technique to the study of dislocations associated with cracks in bulk specimens [J].

Ng, BC ;

Simkin, BA ;

Crimp, MA .

ULTRAMICROSCOPY, 1998, 75 (03) :137-145

[19] Electron channeling contrast imaging of dislocation structures in deformed stoichiometric NiAl [J].

Ng, BC ;

Simkin, BA ;

Crimp, MA .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 240 :150-156

[20] Apparent indentation size effect in a CVD aluminide coated Ni-base superalloy [J].

Ning, B ;

Stevenson, ME ;

Weaver, ML ;

Bradt, RC .

SURFACE & COATINGS TECHNOLOGY, 2003, 163 :112-117

← 1 2 3 4 →