Processing of a single-crystalline CrCoNi medium-entropy alloy and evolution of its thermal expansion and elastic stiffness coefficients with temperature. (1st March 2020)

• Record Type: Journal Article
• Authors: Laplanche, G.; Schneider, M.; Scholz, F.; Frenzel, J.; Eggeler, G.; Schreuer, J.
• Is Part Of: Scripta materialia. Number 177(2020)
• Page Start: 44
• Page End: 48
• Publication Date: 2020-03-01
• Subjects: NiCoCr -- Medium- and High-Entropy alloys -- Single crystal -- Elastic constants -- Dilatation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.09.020
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Image, graphical abstract