Mechanisms of plastic deformation in [1¯11]-oriented single crystals of FeNiMnCrCo high entropy alloy

2016 ◽  
Author(s):  
Irina Kireeva ◽  
Yurii Chumlyakov ◽  
Zinaida Pobedennaya ◽  
Dmitrii Kuksgauzen ◽  
Ibrahim Karaman ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Mechanisms Of Plastic Deformation

scholarly journals Plastic deformation of single crystals of the equiatomic Cr−Mn−Fe−Co−Ni high-entropy alloy in tension and compression from 10 K to 1273 K

2021 ◽  
Vol 203 ◽  
pp. 116454 ◽  
Author(s):  
Marino Kawamura ◽  
Makoto Asakura ◽  
Norihiko L. Okamoto ◽  
Kyosuke Kishida ◽  
Haruyuki Inui ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Tension And Compression

scholarly journals Small-Scale Plastic Deformation of Nanocrystalline High Entropy Alloy

Entropy ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 889 ◽  
Author(s):  
Sanghita Mridha ◽  
Mageshwari Komarasamy ◽  
Sanjit Bhowmick ◽  
Rajiv Mishra ◽  
Sundeep Mukherjee
Keyword(s):  
Plastic Deformation ◽  
Rate Sensitivity ◽  
Small Scale ◽  
High Entropy Alloy ◽  
Compression Tests ◽  
High Entropy ◽  
Grain Sizes ◽  
Plastic Deformation Behavior ◽  
High Strain Rate Sensitivity ◽  
Widespread Interest

High entropy alloys (HEAs) have attracted widespread interest due to their unique properties at many different length-scales. Here, we report the fabrication of nanocrystalline (NC) Al0.1CoCrFeNi high entropy alloy and subsequent small-scale plastic deformation behavior via nano-pillar compression tests. Exceptional strength was realized for the NC HEA compared to pure Ni of similar grain sizes. Grain boundary mediated deformation mechanisms led to high strain rate sensitivity of flow stress in the nanocrystalline HEA.

Influence of plastic deformation on the phase composition, texture, and mechanical properties of the CrMnFeCoNi2Cu high-entropy alloy

2015 ◽  
Vol 37 (1) ◽  
pp. 21-26 ◽  
Author(s):  
I. V. Karpets’ ◽  
O. M. Myslyvchenko ◽  
M. O. Krapivka ◽  
V. F. Gorban’ ◽  
O. S. Makarenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Phase Composition ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals High-Strength Behavior of the Al0.3CoCrFeNi High-Entropy Alloy Single Crystals

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1149
Author(s):  
Irina V. Kireeva ◽  
Yuriy I. Chumlyakov ◽  
Zinaida V. Pobedennaya ◽  
Anna V. Vyrodova ◽  
Anastasia A. Saraeva
Keyword(s):  
Single Crystals ◽  
Yield Point ◽  
Stress Level ◽  
High Stress ◽  
High Strength ◽  
Orientation Dependence ◽  
Temperature Deformation ◽  
High Entropy Alloy ◽  
Shear Stresses ◽  
High Entropy

The main disadvantage of fcc (face-centred cubic lattice) high-entropy alloys is the low stress level at the yield point (σ0.1) at a test temperature above room temperature. This restricts their practical application at high test temperatures from 773 K to 973 K. In this study, we found that a high stress level was reached at the yield point σ0.1 ≈ G/100–G/160 (G is the shear modulus) of the [001]- and [1¯44]-oriented crystals of the Co23.36Cr23.29Fe23.80Ni21.88Al7.67 (Al0.3CoCrFeNi) high-entropy alloy (HEA) within a wide temperature range of 77–973 K under tension, due to the occurrence, of nanotwins, multipoles, dislocations under plastic deformation at 77 K and the subsequent precipitation of ordered L12 and B2 particles. It was shown that grain boundaries are not formed and the samples remain in a single-crystal state after low-temperature deformation and subsequent ageing at 893 K for 50 h. Achieving a high-strength state in the Al0.3CoCrFeNi HEA single crystals induces the orientation dependence of the critical resolved shear stresses (τcr) at T ≥ 200 K (τcr[1¯44] > τcr[001]), which is absent in the initial single-phase crystals, weakens the temperature dependence of σ0.1 above 573 K, and reduces plasticity to 5–13% in the [1¯44] orientation and 15–20% in the [001] orientation.

Plastic deformation mechanisms of equiatomic Ni20Ti20Fe20Al20Cu20 high-entropy alloy at high temperatures

2016 ◽  
Vol 52 (6) ◽  
pp. 3199-3207 ◽  
Author(s):  
Shuyong Jiang ◽  
Dong sun ◽  
Yanqiu Zhang ◽  
Sibing Wang ◽  
Chengzhi Zhao
Keyword(s):  
Plastic Deformation ◽  
High Temperatures ◽  
Deformation Mechanisms ◽  
High Entropy Alloy ◽  
High Entropy

Plastic Deformation of Approximants: Dislocations vs. Phason Lines

1998 ◽  
Vol 553 ◽  
Author(s):  
H. Klein ◽  
M. Feuerbacher ◽  
P. Schall ◽  
K. Urban
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Single Crystals ◽  
Periodic Lattice ◽  
Length Scale ◽  
Relative Importance ◽  
Line Lattice ◽  
Burgers Vector ◽  
Mechanisms Of Plastic Deformation

AbstractDeformation experiments were performed on single crystals of the ξ-AIPdMn approximant in bending geometry at high temperature. Two different mechanisms of plastic deformation are shown to exist in this phase: one based on dislocations and another novel mechanism based on the motion of phason lines. Burgers vector and line directions of dislocations were determined. Phason lines are shown to build a periodic lattice. The interaction of a dislocation with the phason line lattice results in dislocations on another length scale. This meta-dislocation in the periodic phason line lattice has a Burgers vector of magnitude 165 Å. The relative importance of phason lines and dislocations for the plastic deformation is discussed as a function of the orientation of the sample with respect to the bending geometry.

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