期刊
INTERMETALLICS
卷 75, 期 -, 页码 25-30出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2016.05.006
关键词
High entropy alloys; Powder metallurgy; Extrusion; Microstructures; Mechanical properties; Electron backscatter diffraction
资金
- State Key Laboratory of Powder Metallurgy, Central South University
- Innovation-driven Plan in Central South University of China [2015CX004]
An equiatomic FeCoCrNi high alloy (HEA) with both high tensile strength and ductility was produced by a powder metallurgy (P/M) method. The P/M process includes a gas atomization and a hot extrusion of pre-alloyed HEA powder. Microstructures and mechanical properties were characterized using optical microscopy (OP), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and tensile tests. The results show that the P/M FeCoCrNi HEA has a single face centered cubic (fcc) structure and an equiaxed microstructure. No obvious porosity and brittle intermetallic phase was found. The as extruded alloy exhibits a very high tensile strength of 712.5 MPa, and still maintains an elongation as high as 56%. The improvement of the tensile properties is caused by the solid solution strengthening, grain boundary strengthening and homogenous microstructure. Therefore, the powder hot extrusion can be considered as a promising way for preparing large-sized HEAs with high mechanical properties. (C) 2016 Elsevier Ltd. All rights reserved.
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