Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

2020 ◽  
Vol 188 ◽  
pp. 21-25 ◽  
Author(s):  
Muhammad Naeem ◽  
Haiyan He ◽  
Stefanus Harjo ◽  
Takuro Kawasaki ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Dislocation Density ◽  
High Dislocation Density ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Ultralow Temperature

scholarly journals Superior Temperature-Dependent Mechanical Properties and Deformation Behavior of Equiatomic CoCrFeMnNi High-Entropy Alloy Additively Manufactured by Selective Laser Melting

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Young-Kyun Kim ◽  
Sangsun Yang ◽  
Kee-Ahn Lee
Keyword(s):  
Mechanical Properties ◽  
Dislocation Density ◽  
Selective Laser Melting ◽  
High Dislocation Density ◽  
Deformation Mechanisms ◽  
High Entropy Alloy ◽  
Temperature Dependent ◽  
Laser Melting ◽  
High Entropy ◽  
Main Deformation

Abstract The microstructure, temperature-dependent mechanical properties and deformation behaviors of equiatomic CoCrFeMnNi high-entropy alloy (HEA) additively manufactured by selective laser melting (SLM) were investigated. SLM-built HEA had a face-centered cubic (FCC) single-phase random solid solution. In addition, SLM-built HEA was composed of epitaxial growth grains, dislocation network and nano-sized oxides. Room- and high-temperature compression tests confirmed that SLM-built HEA has outstanding mechanical properties in all temperature ranges compared to equiatomic CoCrFeMnNi HEAs reported up to the present. The excellent mechanical properties of SLM-built HEA were achieved with fine grains, high dislocation density and fine precipitates at low temperatures (25 °C to 600 °C), and by high dislocation density and fine precipitates at high temperatures (700 °C or higher). On the other hand, the deformation microstructure showed that slip and deformation twins are the main deformation mechanisms from 25 °C to 600 °C, and slip and partial recrystallization are the main deformation mechanisms above 700 °C. Based on the above findings, this study also discusses correlations among the microstructure, superior mechanical properties and deformation mechanisms of SLM-built equiatomic CoCrFeMnNi HEA.

Microstructure and dislocation density of AlCoCrFeNiSix high entropy alloy coatings by laser cladding

2021 ◽  
Vol 283 ◽  
pp. 128746 ◽  
Author(s):  
Hao Liu ◽  
Tong Zhang ◽  
Shifeng Sun ◽  
Guozhong Zhang ◽  
Xianhua Tian ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Laser Cladding ◽  
High Entropy Alloy ◽  
High Entropy

Particle size effects on dislocation density, microstructure, and phase transformation for high-entropy alloy powders

Materialia ◽  
2021 ◽  
pp. 101161
Author(s):  
Sangho Jeon ◽  
Xuanjiang Liu ◽  
Colby Azersky ◽  
Jie Ren ◽  
Shengbiao Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Dislocation Density ◽  
Size Effects ◽  
High Entropy Alloy ◽  
Particle Size Effects ◽  
High Entropy

scholarly journals Compositional complexity dependence of dislocation density and mechanical properties in high entropy alloy systems

2020 ◽  
Vol 30 (4) ◽  
pp. 545-551
Author(s):  
P. Thirathipviwat ◽  
G. Song ◽  
J. Bednarcik ◽  
U. Kühn ◽  
T. Gemming ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dislocation Density ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Alloy Systems

Observations of dislocation interactions with recrystallized grain boundaries

1988 ◽  
Vol 46 ◽  
pp. 628-629
Author(s):  
C. W. Price
Keyword(s):  
Dislocation Density ◽  
Grain Boundary ◽  
Strain Rate ◽  
Grain Boundaries ◽  
Dislocation Structure ◽  
Hot Deformation ◽  
Static Recrystallization ◽  
High Dislocation Density ◽  
High Angle ◽  
Dislocation Interactions

Little evidence exists on the interaction of individual dislocations with recrystallized grain boundaries, primarily because of the severely overlapping contrast of the high dislocation density usually present during recrystallization. Interesting evidence of such interaction, Fig. 1, was discovered during examination of some old work on the hot deformation of Al-4.64 Cu. The specimen was deformed in a programmable thermomechanical instrument at 527 C and a strain rate of 25 cm/cm/s to a strain of 0.7. Static recrystallization occurred during a post anneal of 23 s also at 527 C. The figure shows evidence of dissociation of a subboundary at an intersection with a recrystallized high-angle grain boundary. At least one set of dislocations appears to be out of contrast in Fig. 1, and a grainboundary precipitate also is visible. Unfortunately, only subgrain sizes were of interest at the time the micrograph was recorded, and no attempt was made to analyze the dislocation structure.

Instant and Persistent Hydrogen Production Using Nano High Entropy Catalyst

2019 ◽  
Author(s):  
Nirmal Kumar ◽  
Subramanian Nellaiappan ◽  
Ritesh Kumar ◽  
Kirtiman Deo Malviya ◽  
K. G. Pradeep ◽  
...  
Keyword(s):  
Formic Acid ◽  
Minimum Energy ◽  
High Entropy Alloy ◽  
Hydrogen Energy ◽  
High Entropy ◽  
Electro Oxidation ◽  
The Individual ◽  
Novel Catalyst ◽  
Cell Anode ◽  
Fuel Cell Anode

<div>Renewable harvesting clean and hydrogen energy using the benefits of novel multicatalytic materials of high entropy alloy (HEA equimolar Cu-Ag-Au-Pt-Pd) from formic acid with minimum energy input has been achieved in the present investigation. The synthesis effect of pristine elements in the HEA drives the electro-oxidation reaction towards non-carbonaceous pathway . The atomistic simulation based on DFT rationalize the distinct lowering of the d-band center for the individual atoms in the HEA as compared to the pristine counterparts. This catalytic activity of the HEA has also been extended to methanol electro-oxidation to show the unique capability of the novel catalyst. The nanostructured HEA, properties using a combination of casting and cry omilling techniques can further be utilized as fuel cell anode in direct formic acid/methanol fuel cells (DFFE).<br></div>

Complex magnetism and magnetoresistance of Gd-Tb-Dy-Ho-Lu hexagonal high-entropy alloy

2018 ◽  
Author(s):  
Janez Dolinšek ◽  
Stanislav Vrtnik ◽  
J. Lužnik ◽  
P. Koželj ◽  
M. Feuerbacher
Keyword(s):  
High Entropy Alloy ◽  
High Entropy

Recent progress in multi-element alloy and nitride coatings sputtered from high-entropy alloy targets

2006 ◽  
Vol 31 (6) ◽  
pp. 723-736 ◽  
Author(s):  
Keng-Hao Cheng ◽  
Chia-Han Lai ◽  
Su-Jien Lin ◽  
Jien-Wei Yeh
Keyword(s):  
Recent Progress ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Nitride Coatings
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