Temperature dependent load partitioning and slip mode transition in a eutectic AlCoCrFeNi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si11.svg"><mml:msub><mml:mrow /><mml:mrow><mml:mn>2.1</mml:mn></mml:mrow></mml:msub></mml:math> high entropy alloy

Eutectic high entropy alloys are gaining increasing attention due to their excellent castability and combination of strength ductility in the as-cast state. However, detailed behavior nano-scale lamellar microstructure during deformation, particular interaction between phases, is not well understood. Here we use in-situ neutron diffraction tensile testing over a wide temperature range (77–673 K) obtain new insights into dependent mechanical interactions within phases initial plastic deformation an AlCoCrFeNi2.1 eutectic alloy. The load was transferred from L12 B2 phase yielding process, changing distribution with strongly suggests that <110>{001} cube slip activated at room above. This points towards alloying design for delayed octahedral-to-cube transition as possible strategy material.