scholarly journals Microstructures and enhanced mechanical properties of an oxide dispersion-strengthened Ni-rich high entropy superalloy fabricated by a powder metallurgical process

2020 ◽  
Vol 839 ◽  
pp. 155724 ◽  
Author(s):  
Taeyeong Kong ◽  
Byungchul Kang ◽  
Ho Jin Ryu ◽  
Soon Hyung Hong
Keyword(s):  
Mechanical Properties ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Metallurgical Process ◽  
High Entropy ◽  
Powder Metallurgical Process

scholarly journals MICROSTRUCTURE AND MECHANICAL PROPERTIES OF OXIDE DISPERSION STRENGTHENED HIGH-ENTROPY ALLOYS CoCrFeMnNi AND CrFe2MnNi

2021 ◽  
pp. 87-94
Author(s):  
I.V. Kolodiy ◽  
O.M. Velikodnyi ◽  
M.A. Tikhonovsky ◽  
V.N. Voyevodin ◽  
O.S. Kalchenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
High Entropy Alloys ◽  
Small Particles ◽  
High Entropy ◽  
Average Grain Size ◽  
Different Temperatures ◽  
Ods Alloys ◽  
Average Size

High-entropy alloys (HEAs) CoCrFeMnNi and CrFe2MnNi, dispersion-strengthened by pre-synthesized nanooxides composition of 80%Y2O3+20%ZrO2 (mol.%) were obtained by mechanical alloying followed by compaction and sintering. Average grain size of the oxide dispersion-strengthened (ODS) alloys was about 2 μm. Oxide precipitates in alloys are characterized by the presence of small particles with an average size of about 10 nm and a density of ≈ 1021 m-3, as well as small amount of larger particles sizes of 50…150 nm. The qualitative composition of particles of different sizes has been established. Mechanical properties of HEAs were studied at different temperatures. It is shown that strengthening of the studied alloys by nanooxide particles leads to a significant increase in strength characteristics.

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