کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1599649 | 1515836 | 2016 | 6 صفحه PDF | دانلود رایگان |
• High entropy alloy (HEA) prepared via powder extrusion exhibits high tensile strength and ductility.
• The high strength results from solid solution strengthening, grain boundary strengthening and homogenous microstructure.
• Powder extrusion can be considered as a promising way for preparing large-sized HEAs with high mechanical properties.
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.
Journal: Intermetallics - Volume 75, August 2016, Pages 25–30