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Nanoindentation studies of the mechanical properties of the μ phase in a creep deformed Re containing nickel-based superalloy

Rehman, Hamad ur and Durst, Karsten and Neumeier, Steffen and Parsa, Alireza B. and Kostka, Aleksander and Eggeler, Gunther and 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, ELSEVIER SCIENCE SA, Switzerland, pp. 202-208, 634, ISSN 09215093, [Online-Edition: http://dx.doi.org/10.1016/j.msea.2015.03.045],
[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 and Durst, Karsten and Neumeier, Steffen and Parsa, Alireza B. and Kostka, Aleksander and Eggeler, Gunther and 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: 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
Official URL: http://dx.doi.org/10.1016/j.msea.2015.03.045
Identification Number: doi:10.1016/j.msea.2015.03.045
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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