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| Hauptseite > Publikationsdatenbank > Thermophysical and Mechanical Properties of Advanced Single Crystalline Co-base Superalloys > print |
| Hauptseite > Publikationsdatenbank > Thermophysical and Mechanical Properties of Advanced Single Crystalline Co-base Superalloys > print |
| 001 | 847991 | ||
| 005 | 20240711085553.0 | ||
| 024 | 7 | _ | |a 10.1007/s11661-018-4705-1 |2 doi |
| 024 | 7 | _ | |a 0360-2133 |2 ISSN |
| 024 | 7 | _ | |a 1073-5623 |2 ISSN |
| 024 | 7 | _ | |a 1543-1940 |2 ISSN |
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| 037 | _ | _ | |a FZJ-2018-03299 |
| 082 | _ | _ | |a 670 |
| 100 | 1 | _ | |a Volz, N. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Thermophysical and Mechanical Properties of Advanced Single Crystalline Co-base Superalloys |
| 260 | _ | _ | |a Boston |c 2018 |b Springer |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1534244099_7415 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a ARTICLE |2 BibTeX |
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| 336 | 7 | _ | |a Journal Article |0 0 |2 EndNote |
| 520 | _ | _ | |a A set of advanced single crystalline γ′ strengthened Co-base superalloys with at least nine alloying elements (Co, Ni, Al, W, Ti, Ta, Cr, Si, Hf, Re) has been developed and investigated. The objective was to generate multinary Co-base superalloys with significantly improved properties compared to the original Co-Al-W-based alloys. All alloys show the typical γ/γ′ two-phase microstructure. A γ′ solvus temperature up to 1174 °C and γ′ volume fractions between 40 and 60 pct at 1050 °C could be achieved, which is significantly higher compared to most other Co-Al-W-based superalloys. However, higher contents of Ti, Ta, and the addition of Re decrease the long-term stability. Atom probe tomography revealed that Re does not partition to the γ phase as strongly as in Ni-base superalloys. Compression creep properties were investigated at 1050 °C and 125 MPa in 〈001〉 direction. The creep resistance is close to that of first generation Ni-base superalloys. The creep mechanisms of the Re-containing alloy was further investigated and it was found that the deformation is located preferentially in the γ channels although some precipitates are sheared during early stages of creep. The addition of Re did not improve the mechanical properties and is therefore not considered as a crucial element in the design of future Co-base superalloys for high temperature applications. Thermodynamic calculations describe well how the alloying elements influence the transformation temperatures although there is still an offset in the actual values. Furthermore, a full set of elastic constants of one of the multinary alloys is presented, showing increased elastic stiffness leading to a higher Young’s modulus for the investigated alloy, compared to conventional Ni-base superalloys. The oxidation resistance is significantly improved compared to the ternary Co-Al-W compound. A complete thermal barrier coating system was applied successfully |
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