ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Processing of a single-crystalline CrCoNi medium-entropy alloy and evolution of its thermal expansion and elastic stiffness coefficients with temperature

G. Laplanche, M. Schneider, F. Scholz, J. Frenzel, G. Eggeler, J. Schreuer.

Scripta Materialia, 177, 44-48, (2020)

The equiatomic CrCoNi alloy is regarded as a model single-phase face-centered cubic medium-entropy alloy. A CrCoNi single crystal was grown by a Bridgman technique using a Ni-base superalloy seed. The elastic stiffnesses and thermal expansion coefficient were determined between 100 K and 673 K employing resonant ultrasound spectroscopy and dilatometry, respectively. All data were found to be in excellent agreement with those reported for polycrystalline CrCoNi. A comparison of the normalized Cauchy pressure of CrCoNi with those of other alloys indicates that interatomic bonds become more directional with increasing Cr-concentration while Co and Ni promote a metallic character.

Keyword(s): NiCoCr; medium- and high-entropy alloys; single crystal; elastic constants; dilatation
Cite as: https://www.sciencedirect.com/science/article/pii/S1359646219305548?via%3Dihub
DOI: 10.1016/j.scriptamat.2019.09.020
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