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000329023 1001_ $$0P:(DE-H253)PIP1026691$$aAhmad, Azkar S.$$b0
000329023 245__ $$aStructural stability of high entropy alloys under pressure and temperature
000329023 260__ $$aMelville, NY$$bAmerican Inst. of Physics$$c2017
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000329023 520__ $$aThe 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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000329023 7001_ $$aSu, Y.$$b1
000329023 7001_ $$aLiu, S. Y.$$b2
000329023 7001_ $$0P:(DE-HGF)0$$aStåhl, K.$$b3
000329023 7001_ $$0P:(DE-HGF)0$$aWu, Y. D.$$b4
000329023 7001_ $$0P:(DE-HGF)0$$aHui, X. D.$$b5
000329023 7001_ $$0P:(DE-H253)PIP1005730$$aRuett, Uta$$b6
000329023 7001_ $$0P:(DE-H253)PIP1007064$$aGutowski, O.$$b7
000329023 7001_ $$00000-0002-5296-9265$$aGlazyrin, K.$$b8
000329023 7001_ $$0P:(DE-H253)PIP1007496$$aLiermann, H. P.$$b9
000329023 7001_ $$0P:(DE-H253)PIP1005928$$aFranz, H.$$b10
000329023 7001_ $$aWang, H.$$b11
000329023 7001_ $$00000-0002-1400-4999$$aWang, X. D.$$b12
000329023 7001_ $$0P:(DE-HGF)0$$aCao, Q. P.$$b13
000329023 7001_ $$0P:(DE-HGF)0$$aZhang, D. X.$$b14
000329023 7001_ $$0P:(DE-H253)PIP1007393$$aJiang, J. Z.$$b15$$eCorresponding author
000329023 773__ $$0PERI:(DE-600)1476463-5$$a10.1063/1.4984796$$gVol. 121, no. 23, p. 235901 -$$n23$$p235901$$tJournal of applied physics$$v121$$x1089-7550$$y2017
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