Structural stability of high entropy alloys under pressure and temperature

被引：47

作者：

Ahmad, Azkar S. ^{[1
,2
]}

Su, Y. ^{[1
,2
]}

Liu, S. Y. ^{[1
,2
]}

Stahl, K. ^{[3
]}

Wu, Y. D. ^{[4
]}

Hui, X. D. ^{[4
]}

Ruett, U. ^{[5
]}

Gutowski, O. ^{[5
]}

Glazyrin, K. ^{[5
]}

Liermann, H. P. ^{[5
]}

Franz, H. ^{[5
]}

Wang, H. ^{[6
]}

Wang, X. D. ^{[1
,2
]}

Cao, Q. P. ^{[1
,2
]}

Zhang, D. X. ^{[7
]}

Jiang, J. Z. ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Sch Mat Sci & Engn, Int Ctr New Struct Mat, Hangzhou 310027, Zhejiang, Peoples R China

[2] Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Lab New Struct Mat, Hangzhou 310027, Zhejiang, Peoples R China

[3] Tech Univ Denmark, Dept Chem, Bldg 207, DK-2800 Lyngby, Denmark

[4] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[5] Deutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22603 Hamburg, Germany

[6] Shenzhen Univ, Inst Nanosurface Sci & Engn, Shenzhen 518060, Peoples R China

[7] Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2017年 / 121卷 / 23期

基金：

中国国家自然科学基金;

关键词：

SOLID-SOLUTION; MICROSTRUCTURE; METAL;

D O I：

10.1063/1.4984796

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The stability of high-entropy alloys (HEAs) is a key issue before their selection for industrial applications. In this study, in-situ high-pressure and high-temperature synchrotron radiation X-ray diffraction experiments have been performed on three typical HEAs Ni20Co20Fe20Mn20Cr20, Hf25Nb25Zr25Ti25, and Re25Ru25Co25Fe25 (at. %), having face-centered cubic (fcc), body-centered cubic (bcc), and hexagonal close-packed (hcp) crystal structures, respectively, up to the pressure of similar to 80 GPa and temperature of similar to 1262 K. Under the extreme conditions of the pressure and temperature, 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 well described with the third order Birch-Murnaghan equation of state. The bulk modulus and its pressure derivative are found to be 88.3 GPa and 4 for bcc-Hf25Nb25Zr25Ti25, 193.9 GPa and 5.9 for fcc-Ni20Co20Fe20Mn20Cr20, and 304.6 GPa and 3.8 for hcp-Re25Ru25Co25Fe25 HEAs, respectively. The thermal expansion coefficient for the three studied HEAs is found to be in the order as follows: fcc-Ni20Co20Fe20Mn20Cr20 > bcc-Hf25Nb25Zr25Ti25 approximate to hcp-Re25Ru25Co25Fe25. Published by AIP Publishing.

引用

页数：6

共 26 条

[1] First-Order Liquid-Liquid Phase Transition in Cerium [J].