Elastic moduli and thermal expansion coefficients of medium-entropy subsystems of the CrMnFeCoNi high-entropy alloy

Journal Article · Tue May 01 00:00:00 EDT 2018 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2018.02.251· OSTI ID:1632363

Laplanche, G. ; Gadaud, P.; Bärsch, C.; Demtröder, K.; Reinhart, C.; Schreuer, J.; George, E. P.

Elastic moduli of a set of equiatomic alloys (CrFeCoNi, CrCoNi, CrFeNi, FeCoNi, MnCoNi, MnFeNi, and CoNi), which are medium-entropy subsystems of the CrMnFeCoNi high-entropy alloy were determined as a function of temperature over the range 293 K–1000 K. Thermal expansion coefficients were determined for these alloys over the temperature range 100 K–673 K. All alloys were single-phase and had the face-centered cubic (FCC) crystal structure, except CrFeNi which is a two-phase alloy containing a small amount of body-centered cubic (BCC) precipitates in a FCC matrix. The temperature dependences of thermal expansion coefficients and elastic moduli obtained here are useful for quantifying fundamental aspects such as solid solution strengthening, and for structural analysis/design. Furthermore, using the above results, the yield strengths reported in literature for these alloys were normalized by their shear moduli to reveal the influence of shear modulus on solid solution strengthening.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1632363
• Alternate ID(s): OSTI ID: 1456785
• Journal Information: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 746 Journal Issue: C; ISSN 0925-8388
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

Related Subjects

36 MATERIALS SCIENCE
High entropy alloys
CoCrFeMnNi
Microstructure
Texture
Thermal expansion coefficient
Elastic constants