Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 210, Issue -, Pages 136-145Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2017.08.011
Keywords
High entropy alloy; C concentration; Tensile properties; Deformation twins
Categories
Funding
- National Natural Science Foundation of China [51571155, 51671150, 414010025]
- Key Science and Technology Program of Shaanxi Province [2012K07-08]
- Education Department Foundation of Shaanxi Province [2013JC14]
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The as-cast CoCrFeNiMnCx (x = 0, 0.05, 0.1,1.5 and 2.0) alloys were prepared in a vacuum arc furnace. The microstructure and phase constituents were characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy, and the tensile properties were tested as well. The results show that the CoCrFeNiMn and CoCrFeNiMnC0.05 alloys have a single phase FCC structure. When the carbon concentration is beyond 0.1 (x = 0.1, 1.5 and 2.0), the M7C3 carbide generates in the inter-dendritic regions and at the grain boundaries. Minor C addition can trigger a transition from dislocation glide dominated plasticity to a mixed deformation mode consisting of dislocation glide and twining, which increases the strength and ductility of the CoCrFeNiMnC0.05 alloy compared with the CoCrFeNiMn alloy. The CoCrFeNiMnC0.05 and CoCrFeNiMnC0.1 alloys have a typical lamellar pattern on the fracture surface due to the formation of columnar grains and the segregation of C at the grain boundaries. The alloys become stronger with the increase of carbon concentration, but at x > 0.1, the ductility decreases and the CoCrFeNiMnC0.15 and CoCrFeNiMnC0.2 alloys present a quasi-cleavage fracture mode. (C) 2017 Elsevier B.V. All rights reserved.
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