Structural stability of high entropy alloys under pressure and temperature

Ahmad, Azkar S.; Wu, Y. D.; Gutowski, O.; Glazyrin, K.; Hui, X. D.; Liermann, H. P.; Zhang, D. X.; Wang, X. D.; Ruett, Uta; Wang, H.; Cao, Q. P.; Jiang, J. Z.; Franz, H.; Liu, S. Y.; Ståhl, K.; Su, Y.

doi:10.1063/1.4984796

Journal Article

PUBDB-2017-05670

Structural stability of high entropy alloys under pressure and temperature

Ahmad, A. S.Extern* ; Su, Y. ; Liu, S. Y. ; Ståhl, K. ; Wu, Y. D. ; Hui, X. D. ; Ruett, U.DESY* ; Gutowski, O.DESY* ; Glazyrin, K. ; Liermann, H. P.DESY* ; Franz, H.DESY* ; Wang, H. ; Wang, X. D. ; Cao, Q. P. ; Zhang, D. X. ; Jiang, J. Z. (Corresponding author)Extern*

2017
American Inst. of Physics Melville, NY

Journal of applied physics 121(23), 235901 (2017) [10.1063/1.4984796]

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Please use a persistent id in citations: doi:10.1063/1.4984796 doi:10.3204/PUBDB-2017-05670

Abstract: The stability of high-entropy alloys (HEAs) is a key issue before their selection for industrial appli-cations. In this study,in-situhigh-pressure and high-temperature synchrotron radiation X-raydiffraction experiments have been performed on three typical HEAs Ni$_{20}$Co$_{20}$Fe$_{20}$Mn$_{20}$Cr$_{20}$,Hf$_{25}$Nb$_{25}$Zr$_{25}$Ti$_{25}$, and Re$_{25}$Ru$_{25}$Co$_{25}$Fe$_{25}$(at. %), having face-centered cubic (fcc), body-centeredcubic (bcc), and hexagonal close-packed (hcp) crystal structures, respectively, up to the pressure of80 GPa and temperature of1262 K. Under the extreme conditions of the pressure and tempera-ture, all three studied HEAs remain stable up to the maximum pressure and temperatures achieved.For these three types of studied HEAs, the pressure-dependence of the volume can be welldescribed with the third order Birch-Murnaghan equation of state. The bulk modulus and itspressure derivative are found to be 88.3 GPa and 4 for bcc-Hf$_{25}$Nb$_{25}$Zr$_{25}$Ti$_{25}$, 193.9 GPa and5.9 for fcc-Ni$_{20}$Co$_{20}$Fe$_{20}$Mn$_{20}$Cr$_{20}$, and 304.6 GPa and 3.8 for hcp-Re25Ru25Co25Fe25HEAs,respectively. The thermal expansion coefficient for the three studied HEAs is found to be in theorder as follows: fcc-Ni$_{20}$Co$_{20}$Fe$_{20}$Mn$_{20}$Cr$_{20}$ > bcc-Hf$_{25}$Nb$_{25}$Zr$_{25}$Ti$_{25}$hcp-Re$_{25}$Ru$_{25}$Co$_{25}$Fe$_{25}$.

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