Rehman, Hamad ur ; Durst, Karsten ; Neumeier, Steffen ; Parsa, Alireza B. ; Kostka, Aleksander ; Eggeler, Gunther ; Göken, Mathias (2015):
Nanoindentation studies of the mechanical properties of the μ phase in a creep deformed Re containing nickel-based superalloy.
In: Materials Science and Engineering: A, 634, pp. 202-208. ELSEVIER SCIENCE SA, Switzerland, ISSN 09215093,
[Article]
Abstract
Addition of Re in nickel-based superalloys results in an increase of the creep life. However, Re is also known to segregate to the dendrite core and to promote the formation of topologically closed packed (TCP) phases. In the present work, the local segregation of Re was studied in the heat treated and creep deformed state of a nickel-based superalloy. Tensile creep deformation at 1050 degrees C resulted in the formation of TCP phases in the dendritic regions. Characterization using TEM confirmed the presence of mu phase that grows on {111} planes. Measurements with a nanoindenting AFM show that the mu phase is harder and shows less work hardening than both the gamma and the gamma' phases. Furthermore, in the creep deformed state the hardness of the matrix phase is very similar in the dendrite core and in interdendritic areas, although Re is still enriched in the dendrite core. It is shown that Re is consumed in the dendrite core by the TCP phases. (C) 2015 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Erschienen: | 2015 |
| Creators: | Rehman, Hamad ur ; Durst, Karsten ; Neumeier, Steffen ; Parsa, Alireza B. ; Kostka, Aleksander ; Eggeler, Gunther ; Göken, Mathias |
| Title: | Nanoindentation studies of the mechanical properties of the μ phase in a creep deformed Re containing nickel-based superalloy |
| Language: | English |
| Abstract: | Addition of Re in nickel-based superalloys results in an increase of the creep life. However, Re is also known to segregate to the dendrite core and to promote the formation of topologically closed packed (TCP) phases. In the present work, the local segregation of Re was studied in the heat treated and creep deformed state of a nickel-based superalloy. Tensile creep deformation at 1050 degrees C resulted in the formation of TCP phases in the dendritic regions. Characterization using TEM confirmed the presence of mu phase that grows on {111} planes. Measurements with a nanoindenting AFM show that the mu phase is harder and shows less work hardening than both the gamma and the gamma' phases. Furthermore, in the creep deformed state the hardness of the matrix phase is very similar in the dendrite core and in interdendritic areas, although Re is still enriched in the dendrite core. It is shown that Re is consumed in the dendrite core by the TCP phases. (C) 2015 Elsevier B.V. All rights reserved. |
| Journal or Publication Title: | Materials Science and Engineering: A |
| Volume of the journal: | 634 |
| Publisher: | ELSEVIER SCIENCE SA, Switzerland |
| Uncontrolled Keywords: | Nanoindentation, TCP, Nickel based superalloy, μ phase |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 25 Jan 2016 11:43 |
| URL / URN: | http://dx.doi.org/10.1016/j.msea.2015.03.045 |
| Identification Number: | doi:10.1016/j.msea.2015.03.045 |
| PPN: | |
| Funders: | We acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) through projects A6 and A1 of the collaborative research center SFB/TR 103. |
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