Experimental and theoretical study of Ti20Zr20Hf20Nb20X20 (X = V or Cr) refractory high-entropy alloys
Experimental and theoretical study of Ti20Zr20Hf20Nb20X20 (X = V or Cr) refractory high-entropy alloys
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DOI：
10.1016/j.ijrmhm.2014.07.009
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发表时间：
2014-11-01
影响因子：
3.6
通讯作者：
Vitos, L.
中科院分区：
文献类型：
--
作者：
Fazakas, E.;Zadorozhnyy, V.;Vitos, L.
研究了在惰性气氛中感应熔炼和铸造的Ti 20 Zr 20 Hf 20 Nb 20 X 20（X = V或Cr）高熵合金（HEA）的显微组织和力学性能。通过X射线衍射仪和扫描电子显微镜研究了这些合金的结构。结果表明，Ti 20 Zr 20 Hf 20 Nb 20 X 20主要为体心立方（BCC）结构，而体心立方基体中含有少量的Cr2Nb和Cr2Hf金属间化合物。Ti20Zr20Hf20Nb20X20合金在室温下具有较高的强度和均匀的压缩变形。含Cr的Laves相在铸造过程中偏析，进一步提高了Ti20Zr20Hf20Nb20X20合金的强度和硬度。在573、773、973和1173 K下短时间（10 min）热处理后，结构和机械性能几乎保持不变，表明这两种合金对工作温度峰值的耐受性。从头计算预测这些和类似的耐火HEM的延性行为。杨氏模量E的理论计算值与实验值吻合较好。(C)2014爱思唯尔有限公司版权所有。
We investigated the microstructure and mechanical properties of Ti20Zr20Hf20Nb20X20 (X = V or Cr) high-entropy alloys (HEA), produced by induction melting and casting in inert atmosphere. The structures of these alloys were studied via X-ray diffractometry and scanning electron microscopy. Results show that Ti20Zr20Hf20Nb20X20 has mainly the body centered cubic (BCC) structure, whereas the BCC matrix of Ti20Zr20Hf20Nb20X20 contains small amount of Cr2Nb and Cr2Hf intermetallic compounds. Ti20Zr20Hf20Nb20X20 alloy shows the high strength and the homogeneous deformation under compression at room temperature. The strength and hardness of Ti20Zr20Hf20Nb20X20 alloy are further enhanced by the Cr-containing Laves phases segregated during casting. The structural and mechanical properties remained almost unchanged after a short time (10 min) heat treatment at 573, 773, 973 and 1173 K indicating the resistance to working temperature peaks for these two alloys. Ab initio calculations predict ductile behavior for these and similar refractory HEM. The theoretically calculated Young's modulus E is in good agreement with the experimental ones. (C) 2014 Elsevier Ltd. All rights reserved.