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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)

DOI: 10.1016/j.scriptamat.2019.09.020

Download: BibTEX

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.

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{"type":"article", "name":"g.laplanche20203", "author":"G. Laplanche and M. Schneider and F. Scholz and J. Frenzel and G. Eggeler and J. Schreuer", "title":"Processing of a singlecrystalline CrCoNi mediumentropy alloy and evolution of its thermal expansion and elastic stiffness coefficients with temperature", "journal":"Scripta Materialia", "volume":"177", "OPTnumber":"", "OPTmonth":"3", "year":"2020", "OPTpages":"44-48", "OPTnote":"", "OPTkey":"NiCoCr; medium- and high-entropy alloys; single crystal; elastic constants; dilatation", "DOI":"10.1016/j.scriptamat.2019.09.020"}
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