Evolution of γ/γ' phases, their misfit and volume fractions in Al10Co25Cr8Fe15Ni36Ti6 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-Zentrum Berlin für Materialien und Energie (HZB)

S. Haas

University of Bayreuth

J. M. Yu

Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)

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-Zentrum Berlin für Materialien und Energie (HZB)

S. Matsumura

Kyushu University

F. Vogel

Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)

University of Alabama

N. Wanderka

Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)

Materials Characterization

1044-5803 (ISSN)

Vol. 154 363-376

Subject Categories

Inorganic Chemistry

Metallurgy and Metallic Materials

Condensed Matter Physics

DOI

10.1016/j.matchar.2019.06.009

More information

Latest update

8/28/2020