Elemental partitioning, lattice misfit and creep behaviour of Cr containing γ′ strengthened Co base superalloys

Povstugar I, Zenk C, Li R, Choi PP, Neumeier S, Dolotko O, Hoelzel M, Göken M, Raabe D (2016)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Materials Science and Technology Taylor & Francis

Book Volume: 32

Pages Range: 220-225

Journal Issue: 3

DOI: 10.1179/1743284715Y.0000000112

Abstract

Novel Cr containing Co-Al-W base superalloys were studied by atom probe tomography and neutron diffraction. Cr is found to predominantly partition to the γ matrix and decrease partitioning of W to γ′. Furthermore, Cr significantly enhances the γ′ volume fraction, decreases the γ/γ′ lattice misfit and deteriorates the creep resistance. Addition of Ni to the Cr containing alloys affects partitioning of W and Al, further decreases the lattice misfit and results in the formation of irregularly shaped precipitates. Al, W and Cr tend to occupy the ‘B' sublattice in the γ′-A3B phase (L12 type), while Co and Ni reside in the ‘A' sublattice.

Authors with CRIS profile

Carolin Zenk Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

B03 (FP2): Einkristalline y'-gehärtete Co-Basis-Superlegierungen - Legierungsentwicklung, Gitterfehlpassung und mechanische Eigenschaften (SFB/TRR 103) SFB/TRR 103 Jan. 1, 2016 - Dec. 31, 2019

Involved external institutions

Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research DE Germany (DE) Technische Universität München (TUM) DE Germany (DE)

How to cite

APA:

Povstugar, I., Zenk, C., Li, R., Choi, P.-P., Neumeier, S., Dolotko, O.,... Raabe, D. (2016). Elemental partitioning, lattice misfit and creep behaviour of Cr containing γ′ strengthened Co base superalloys. Materials Science and Technology, 32(3), 220-225. https://dx.doi.org/10.1179/1743284715Y.0000000112

MLA:

Povstugar, I., et al. "Elemental partitioning, lattice misfit and creep behaviour of Cr containing γ′ strengthened Co base superalloys." Materials Science and Technology 32.3 (2016): 220-225.

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