Suppression of σ-phase in nanocrystalline CoCrFeMnNiV high entropy alloy by unsolicited contamination during mechanical alloying and spark plasma sintering

被引：9
|
作者：
Vaidya, M. [1 ,2 ]
Karati, Anirudha [3 ]
Guruvidyathri, K. [1 ,4 ]
Nagini, M. [1 ]
Pradeep, K. G. [1 ,5 ]
Murty, B. S. [1 ]
机构：
[1] Indian Inst Technol Madras, Dept Met & Mat Engn, Chennai 600036, Tamil Nadu, India
[2] Indian Inst Technol Hyderabad, Dept Mat Sci & Met Engn, Sangareddy 502285, Telangana, India
[3] Indian Inst Technol Madras, Dept Chem, Chennai 600036, Tamil Nadu, India
[4] Univ Hyderabad, Sch Engn Sci & Technol, Hyderabad 500046, India
[5] Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2020年 / 255卷
关键词：
High-entropy alloy; Nanocrystalline materials; Spark plasma sintering; Atom probe tomography; Calphad; THERMAL-STABILITY; GRAIN-GROWTH; COCRFENI; EVOLUTION; MICROSTRUCTURE; PRECIPITATION; KINETICS;
D O I：
10.1016/j.matchemphys.2020.123558
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
CoCrFeMnNiV high entropy alloy (HEA) exhibits a high content of sigma-phase (70 vol%) when produced by casting route. In the present work, a combination of mechanical alloying (MA) and spark plasma sintering (SPS) has been used to synthesize nanocrystalline CoCrFeMnNiV HEA where the formation of sigma-phase has been avoided. Electron microscopy and atom probe tomography analysis indicated the formation of FCC structured HEA matrix along with (Cr,V) carbide (15 vol%) precipitation, without the presence of sigma-phase in SPS processed alloy. Gibbs energy vs composition (G-x) diagrams of binary subsystems and possible carbides and oxides substantiate the absence of sigma-phase during SPS of CoCrFeMnNiV alloy. Thus, the unsolicited contamination during MA-SPS route proves beneficial in suppressing the complex phase formation.
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页数：9
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