期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 47, 期 -, 页码 131-138出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2014.07.009
关键词
Laves phases; Mechanical properties; Casting; Grain boundaries, structure; Diffraction, electron microscopy, scanning; Ab initio calculations
资金
- World Premier International Research Center Initiative (WPI), MEXT, Japan, the Ministry of Education and Science of the Russian Federation [K2-2014-013]
- Hungarian OTKA [84078, 109570]
- National 973 Project of China [2011CB606401]
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.
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