کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1599649 1515836 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure and mechanical properties of equimolar FeCoCrNi high entropy alloy prepared via powder extrusion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Microstructure and mechanical properties of equimolar FeCoCrNi high entropy alloy prepared via powder extrusion
چکیده انگلیسی


• 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 75, August 2016, Pages 25–30
نویسندگان
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