Temperature dependent load partitioning and slip mode transition in a eutectic AlCoCrFeNi2.1 high entropy alloy
Journal article, 2021

Eutectic high entropy alloys are gaining increasing attention due to their excellent castability and combination of strength and ductility in the as-cast state. However, the detailed behavior of the nano-scale lamellar microstructure during deformation, and in particular the interaction between the phases, is not well understood. Here we use in-situ neutron diffraction during tensile testing over a wide temperature range (77–673 K) to obtain new insights into the temperature dependent mechanical interactions between and within phases during initial plastic deformation of an AlCoCrFeNi eutectic high entropy alloy. The load was transferred from the L1 to the B2 phase during the yielding process, and the changing load distribution within the L1 phase with increasing temperature strongly suggests that <110>{001} cube slip is activated at room temperature and above. This points towards alloying design for delayed octahedral-to-cube slip transition as a possible strategy for increasing the high temperature strength of material. 2.1 2 2

Load distribution

Cube slip

Elastic lattice strains

Eutectic high entropy alloy

Neutron diffraction

Author

Nitesh Raj Jaladurgam

Chalmers, Physics, Microstructure Physics

Adrianna Lozinko

Chalmers, Industrial and Materials Science, Materials and manufacture

Sheng Guo

Chalmers, Industrial and Materials Science, Materials and manufacture

Tung Lik Lee

STFC Rutherford Appleton Laboratory

Magnus Hörnqvist Colliander

Chalmers, Physics, Microstructure Physics

Materialia

25891529 (eISSN)

Vol. 17 101118

Subject Categories

Ceramics

Other Materials Engineering

Metallurgy and Metallic Materials

DOI

10.1016/j.mtla.2021.101118

More information

Latest update

6/17/2021