Effect of V content on microstructure and mechanical properties of the CoCrFeMnNiVx high entropy alloys

被引:355
作者
Stepanov, N. D. [1 ]
Shaysultanov, D. G. [1 ]
Salishchev, G. A. [1 ]
Tikhonovsky, M. A. [2 ]
Oleynik, E. E. [2 ]
Tortika, A. S. [2 ]
Senkov, O. N. [3 ]
机构
[1] Belgorod State Univ, Lab Bulk Nanostruct Mat, Belgorod 803015, Russia
[2] NAS Ukraine, Kharkov Inst Phys & Technol, Natl Sci Ctr, UA-61108 Kharkov, Ukraine
[3] UES Inc, Dayton, OH 45432 USA
基金
俄罗斯科学基金会;
关键词
Metals and alloys; Crystal structure; Phase transitions; Scanning electron microscopy (SEM); Transmission electron microscopy (TEM); SIGMA-PHASE FORMATION; SOLID-SOLUTION PHASE; TENSILE PROPERTIES; VANADIUM ADDITION; AL ADDITION; CR; STABILITY; BEHAVIOR; DESIGN; MN;
D O I
10.1016/j.jallcom.2014.12.157
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Crystal structure, microstructure, microhardness and compression properties of CoCrFeMnNiVx (x = 0, 0.25, 0.5, 0.75, 1) high entropy alloys were examined. The alloys were produced by vacuum arc melting and studied in as-solidified and homogenized (annealing at 1000 degrees C for 24 h) conditions. The CoCrFeMnNi alloy was a single-phase fcc solid solution in both conditions. The CoCrFeMnNiV0.25 alloy had a single-phase fcc structure in as-solidified condition, but similar to 2 vol.% fine particles of a sigma phase precipitated after annealing. The alloys with x = 0.5, 0.75 and 1.0 contained the sigma phase already in as-solidified condition. The sigma-phase volume fraction increased with an increase in the V content, and in CoCrFeMnNiV the sigma phase became the matrix phase. After homogenization treatment, the volume fraction of the sigma phase increased in all three alloys by similar to 8% due to additional precipitation of fine particles inside the fcc phase. Phase composition and microstructure of the alloys was analyzed employing criteria for solid solution/intermetallic phase formation. The effect of alloys' chemical composition on the volume fraction of constitutive phases was discussed. A modified valence electron concentration (VEC) criterion, which takes into account localized lattice distortions around V atoms, was suggested to correctly predict sigma phase formation in the CoCrFeNiMnVx alloys. It was demonstrated that the volume fraction of sigma phase was proportional to the cumulative Cr and V concentration. Mechanical properties of the alloys were greatly affected by the sigma phase. The CoCrFeMnNi and CoCrFeMnNiV0.25 alloys were soft and ductile, but an increase in the sigma-phase volume fraction resulted in continuous strengthening and loss of ductility. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:170 / 185
页数:16
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