Nanostructured Oxide‐Dispersion‐Strengthened CoCrFeMnNi High Entropy Alloys with High Thermal Stability

2021 ◽  
Author(s):  
Xiang Zhang ◽  
Fei Wang ◽  
Xueliang Yan ◽  
Xing-Zhong Li ◽  
Khalid Hattar ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Oxide Dispersion Strengthened ◽  
High Thermal Stability ◽  
Oxide Dispersion ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Nanostructured Oxide

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.

Nanoporous high-entropy alloys for highly stable and efficient catalysts

2019 ◽  
Vol 7 (11) ◽  
pp. 6499-6506 ◽  
Author(s):  
Hua-Jun Qiu ◽  
Gang Fang ◽  
Yuren Wen ◽  
Pan Liu ◽  
Guoqiang Xie ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
High Thermal Stability ◽  
High Entropy Alloys ◽  
High Entropy

A general dealloying strategy is developed to prepare multi-component alloys with high thermal stability, electrochemical durability, and catalytic activity.

Thermal stability and oxidation resistance of FeCrxCoNiB high-entropy alloys coatings by laser cladding

2019 ◽  
Vol 359 ◽  
pp. 132-140 ◽  
Author(s):  
Fa Chang ◽  
Bingjie Cai ◽  
Chong Zhang ◽  
Biao Huang ◽  
Shuai Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Oxidation Resistance ◽  
Laser Cladding ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals Effects of La on Thermal Stability, Phase Formation and Magnetic Properties of Fe–Co–Ni–Si–B–La High Entropy Alloys

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1907
Author(s):  
Jiaming Li ◽  
Jianliang Zuo ◽  
Hongya Yu
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Phase Formation ◽  
Crystallization Temperature ◽  
High Entropy Alloys ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
High Entropy ◽  
Bcc Phase

The microstructure, phase formation, thermal stability and soft magnetic properties of melt-spun high entropy alloys (HEAs) Fe27Co27Ni27Si10−xB9Lax with various La substitutions for Si (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) were investigated in this work. The Fe27Co27Ni27Si10−xB9La0.6 alloy shows superior soft magnetic properties with low coercivity Hc of ~7.1 A/m and high saturation magnetization Bs of 1.07 T. The content of La has an important effect on the primary crystallization temperature (Tx1) and the secondary crystallization temperature (Tx2) of the alloys. After annealing at relatively low temperature, the saturation magnetization of the alloy increases and the microstructure with a small amount of body-centered cubic (BCC) phase embedded in amorphous matrix is observed. Increasing the annealing temperature reduces the magnetization due to the transformation of BCC phase into face-centered cubic (FCC) phase.

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