scholarly journals Phase Decomposition of a Single-Phase AlTiVNb High-Entropy Alloy after Severe Plastic Deformation and Annealing

2017 ◽  
Vol 19 (4) ◽  
pp. 1600674 ◽  
Author(s):  
Benjamin Schuh ◽  
Bernhard Völker ◽  
Verena Maier-Kiener ◽  
Juraj Todt ◽  
Jiehua Li ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Single Phase ◽  
High Entropy Alloy ◽  
Phase Decomposition ◽  
High Entropy

Strength enhancement of high entropy alloy HfNbTaTiZr by severe plastic deformation

2018 ◽  
Vol 768 ◽  
pp. 924-937 ◽  
Author(s):  
J. Čížek ◽  
P. Haušild ◽  
M. Cieslar ◽  
O. Melikhova ◽  
T. Vlasák ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Strength Enhancement

The influence of severe plastic deformation on microstructure of CoCrFeMnNi High-Entropy Alloy.

2016 ◽  
Vol 2016 (0) ◽  
pp. PS-36
Author(s):  
Nobuhiro IMAKURA ◽  
Naoko IKEO ◽  
Alok Singh ◽  
Ivan Gutierrez Urrutia ◽  
Yoshiaki OSAWA ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Entropy Alloy ◽  
High Entropy

Evidence of FCC to HCP and BCC-martensitic transformations in a CoCrFeNiMn high-entropy alloy by severe plastic deformation

2021 ◽  
Vol 807 ◽  
pp. 140875
Author(s):  
Hamed Shahmir ◽  
Peyman Asghari-Rad ◽  
Mohammad Sajad Mehranpour ◽  
Farsad Forghani ◽  
Hyoung Seop Kim ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Martensitic Transformations ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Severe Plastic Deformation and Phase Transformations in High Entropy Alloys: A Review

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 54
Author(s):  
Boris B. Straumal ◽  
Roman Kulagin ◽  
Brigitte Baretzky ◽  
Natalia Yu. Anisimova ◽  
Mikhail V. Kiselevskiy ◽  
...  
Keyword(s):  
Solid Solution ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Phase Transformations ◽  
Single Phase ◽  
Materials Science ◽  
Bulk Solution ◽  
Second Phase ◽  
High Entropy Alloys ◽  
High Entropy

This review discusses an area of expertise that is at the intersection of three large parts of materials science. These are phase transformations, severe plastic deformation (SPD), and high-entropy alloys (HEA). First, SPD makes it possible to determine the borders of single-phase regions of existence of a multicomponent solid solution in HEAs. An important feature of SPD is that using these technologies, it is possible to obtain second-phase nanoparticles included in a matrix with a grain size of several tens of nanometers. Such materials have a very high specific density of internal boundaries. These boundaries serve as pathways for accelerated diffusion. As a result of the annealing of HEAs subjected to SPD, it is possible to accurately determine the border temperature of a single-phase solid solution area on the multicomponent phase diagram of the HEA. Secondly, SPD itself induces phase transformations in HEAs. Among these transformations is the decomposition of a single-phase solid solution with the formation of nanoparticles of the second phase, the formation of high-pressure phases, amorphization, as well as spinodal decomposition. Thirdly, during SPD, a large number of new grain boundaries (GBs) are formed due to the crystallites refinement. Segregation layers exist at these new GBs. The concentration of the components in GBs differs from that in the bulk solid solution. As a result of the formation of a large number of new GBs, atoms leave the bulk solution and form segregation layers. Thus, the composition of the solid solution in the volume also changes. All these processes make it possible to purposefully influence the composition, structure and useful properties of HEAs, especially for medical applications.

scholarly journals Effect of Temperature of Severe Plastic Deformation on Mechanical Properties of High Entropy Alloy CoCrFeNiMn

2020 ◽  
Keyword(s):  
Plastic Deformation ◽  
Yield Strength ◽  
Severe Plastic Deformation ◽  
Structural State ◽  
Effect Of Temperature ◽  
High Entropy Alloy ◽  
Active Deformation ◽  
High Entropy ◽  
Temperature Range ◽  
Average Grain Size

High entropy alloy (HEA) CoCrFeNiMn was produced by arc melting of the components in high-purity argon atmosphere with consequent multiple homogenization annealing. The disc-shaped samples with diameter 10 mm and thickness of ~ 1 mm were produced from the ingots obtained. These samples were subjected to severe plastic deformation by high pressure torsion (HPT) in Bridgman anvil at a hydrostatic pressure of 6 GPa and at temperature 77 K. Plungers have been rotated for 5 times at a speed of 0.2 rot/min that allows to produce uniform nanocrystalline structural state with average grain size of less than 100 nm. Mechanical tests have been provided under conditions of uniaxial compression of rectangular samples with size 1.3×0.6×0.6 mm3. The samples were cut from the discs after HPT at a distance of 3 mm form disc centre. The analysis of stress-strain curves have been made in the temperature range of 300-4.2 K for the obtained nanostructured state. It was found that yield stress value monotonically increasing from 1.44 GPa to 2.48 GPa while the temperature decrease from 300 K to 4.2 K, which is typical for thermally activated character of plastic deformation. Anomalous decrease in yield strength values in comparison with the same values for nanostructured HEA after HPT at 300 K was established in all the temperature range (300-4.2 K) for the structural state after HPT at 77 K. The conducted analysis have been shown that the observed anomalous behaviour of yield strength during active deformation is conditioned by peculiarities of microsturcture appearing after cryodeformation by HPT at 77 K, in particular by formation of martensite phase with hcp lattice and connected with this decrease in dislocation density. It was shown that peculiarities of microstructure after HPT at 77 K effect considerably not only on strength of the alloy in local areas, i.e. its microhardness value, but also on the acting stresses responsible for the plastic deformation process under conditions of active deformation of nanocrystalline HEA CoCrFeMnNi.

Severe plastic deformation driven nanostructure and phase evolution in a Al 0.5 CoCrFeMnNi dual phase high entropy alloy

2017 ◽  
Vol 91 ◽  
pp. 150-157 ◽  
Author(s):  
T.S. Reddy ◽  
I.S. Wani ◽  
T. Bhattacharjee ◽  
S.R. Reddy ◽  
R. Saha ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Phase Evolution ◽  
High Entropy Alloy ◽  
Dual Phase ◽  
High Entropy

scholarly journals Influence of severe plastic deformation on the microstructure and hardness of a CoCrFeNi high-entropy alloy: A comparison with CoCrFeNiMn

2019 ◽  
Vol 154 ◽  
pp. 304-314 ◽  
Author(s):  
Jenő Gubicza ◽  
Pham Tran Hung ◽  
Megumi Kawasaki ◽  
Jae-Kyung Han ◽  
Yakai Zhao ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Entropy Alloy ◽  
High Entropy
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