Evolution of γ/γ' phases, their misfit and volume fractions in Al10 Co25 Cr8 Fe15 Ni36 Ti6 compositionally complex alloy
Journal article, 2019
Recently introduced Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy has been investigated in the as-cast state and after heat treatment in a thorough characterization. The combination of optical, scanning and transmission electron microscopy, three dimensional atom probe and x-ray diffraction, both at lab and synchrotron level provides precise information of the microstructural evolution. After the typical dendritic solidification the alloy reveals dendritic cores consisting of γ and γ' phases and interdendritic regions consisting of η and Heusler type phases. Homogenization removes the interdendritic regions and their phases and subsequent annealing produces a microstructure similar to Ni based superalloys consisting of γ/γ' phases. In addition, about 50 μm sized Al-Ni rich needle-shaped precipitates of Heusler type structure can be observed. The four phases and their evolution with heat treatment are investigated in detail. Special focus lies on the γ/γ' misfit determination and the determination of volume fractions by different methods.
Transmission electron microscopy
Misfit
High entropy alloys
Compositionally complex alloys
Atom probe tomography
Synchrotron diffraction
Author
A. M. Manzoni
Helmholtz
S. Haas
University of Bayreuth
J. M. Yu
Helmholtz
University of Manchester
H. M. Daoud
Neue Materialien Bayreuth GmbH
U. Glatzel
University of Bayreuth
Hisham Aboulfadl
Universität des Saarlandes
Chalmers, Physics, Microstructure Physics
Frank Mücklich
Universität des Saarlandes
R. Duran
Institute for Materials Science
G. Schmitz
Institute for Materials Science
D. M. Többens
Helmholtz
S. Matsumura
Kyushu University
F. Vogel
Helmholtz
University of Alabama
N. Wanderka
Helmholtz
Materials Characterization
1044-5803 (ISSN)
Vol. 154 363-376Subject Categories
Inorganic Chemistry
Metallurgy and Metallic Materials
Condensed Matter Physics
DOI
10.1016/j.matchar.2019.06.009