Effects of nanotwins on the mechanical properties of Al x CoCrFeNi high entropy alloy thin films

Feng, Xiaobin; Fu, Wei; Zhang, J.Y.; Zhao, Jun; Li, J.; Wu, Kai; Liu, G.; Sun, Jun

doi:10.1016/j.scriptamat.2017.06.009

Cited by 93 publications

(22 citation statements)

References 34 publications

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“…For example, the equiatomic FeCrCoNi is predicted to show SF instead of MTW if the alloy remains in the ferromagnetic state at room temperature. The present theoretical results are helpful to explore The TWIP effect was indeed observed in the considered HEAs at various deformation conditions in experimental, and it was suggested to be the main reason for the measured large work hardenability [10][11][12][13][14][15]. In addition, smaller twin spacing and larger twin thickness were reported in the as-cast alloy compared with the recrystallized one, i.e.…”

supporting

confidence: 52%

“…So far, investigations of γ -surface for HEAs have been very limited, which can be attributed to the complexity of the problem related to the chemical and magnetic disorders. Using first-principle methods, here we reveal the temperature and composition-dependent γ -surfaces of the FeCrCoNiAl x (0 ≤ x ≤ 0.3) HEAs, which have been noted for their excellent combinations of strength and ductility [10][11][12][13][14][15]. We provide a detailed analysis of the chemical and magnetic contributions, explain the observed mechanical behavior, and predict the plasticity mechanisms at cryogenic and strain conditions.…”

mentioning

confidence: 89%

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Plastic deformation transition in FeCrCoNiAl_x high-entropy alloys

Huang

Holmström

et al. 2019

Materials Research Letters

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The competition between plastic deformation mechanisms in FeCrCoNiAl x high-entropy alloys is explored as a function of temperature by first-principle theory. Investigating the generalized stacking fault energy, we identify a strong interplay between the magnetic and chemical effects. At cryogenic conditions (ferromagnetic state), full-slip is accompanied by martensitic transformation, whereas increasing temperature towards room-temperature (paramagnetic state) changes the deformation mechanism to full-slip plus twinning. Alloying with Al reduces the susceptibility for stacking fault formation in the ferromagnetic state and promotes twinning in the paramagnetic state. The present advance in magneto-plasticity reveals new opportunities for tailoring the mechanical response in high-entropy alloys. IMPACT STATEMENT Magnetic state critically affects the γ-surface of FeCrCoNiAl x and is responsible for the emergence of the exceptional metastable twinning phenomena at room temperature.

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supporting

confidence: 52%

mentioning

confidence: 89%

Plastic deformation transition in FeCrCoNiAl_x high-entropy alloys

Huang

Holmström

et al. 2019

Materials Research Letters

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“…So far, HEATFs were verified to have remarkable effects on the hardness [ 24 ]. A series work on HEATFs was done not only on the high throughput fabrication but also on the mechanical properties, including the hardness and corrosion properties [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. The previous work has greatly promoted the industrial application of HEATFs.…”

Section: Introductionmentioning

confidence: 99%

High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Liao

Zhang

Liu

et al. 2019

Entropy

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Recently, high-entropy alloy thin films (HEATFs) with nanocrystalline structures and high hardness were developed by magnetron sputtering technique and have exciting potential to make small structure devices and precision instruments with sizes ranging from nanometers to micrometers. However, the strength and deformation mechanisms are still unclear. In this work, nanocrystalline Al 0.3 CoCrFeNi HEATFs with a thickness of~4 µm were prepared. The microstructures of the thin films were comprehensively characterized, and the mechanical properties were systematically studied. It was found that the thin film was smooth, with a roughness of less than 5 nm. The chemical composition of the high entropy alloy thin film was homogeneous with a main single face-centered cubic (FCC) structure. Furthermore, it was observed that the hardness and the yield strength of the high-entropy alloy thin film was about three times that of the bulk samples, and the plastic deformation was inhomogeneous. Our results could provide an in-depth understanding of the mechanics and deformation mechanism for future design of nanocrystalline HEATFs with desired properties.

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“…These are focussed on mechanical properties [4][5][6], structure and morphology [7], electrical properties [8], and magnetic properties [9]. There has been a particular focus on thin films of the HEA CrFeCoNiCu, with [10][11][12][13][14][15] or without a sixth component [16,17].…”

Section: Introductionmentioning

confidence: 99%

Thin films of AlCrFeCoNiCu high-entropy alloy by pulsed laser deposition

Cropper

2018

Applied Surface Science

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Pulsed laser deposition has been used to prepare thin films of the high entropy alloy AlCrFeCoNiCu. The 35 nm films were deposited in ultra-high vacuum onto glass at room temperature and above and analysed using X-ray diffraction and X-ray photoelectron spectroscopy. Films deposited at room temperature exhibit a mix of FCC and BCC reflections, the FCC crystallites having size similar to the film thickness, but the BCC crystallites are larger. The intensity of the reflections from both crystal structures reduce with increasing deposition temperature, the fall in BCC commencing at lower temperature than the FCC associated with a reduction of the content of Al and Cu. X-ray photoelectron spectroscopy shows that the films deposited at room temperature are closer to stoichiometry than those at higher temperatures. An important feature of the X-ray photoelectron spectroscopy depth profiles is surface segregation, the outer 3 nm of the high entropy alloy films has higher concentration of Al and, to a lesser extent, Cr. Highlights • The films exhibit mixed FCC and BCC structure. • With increasing deposition temperature, FCC and BCC reflections reduce associated with loss of Al and Cu. • Surface segregation enriches the surface of the films in Al and to a lesser extent Cr.

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Effects of nanotwins on the mechanical properties of Al x CoCrFeNi high entropy alloy thin films

Cited by 93 publications

References 34 publications

Plastic deformation transition in FeCrCoNiAl_x high-entropy alloys

Plastic deformation transition in FeCrCoNiAl_x high-entropy alloys

High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Thin films of AlCrFeCoNiCu high-entropy alloy by pulsed laser deposition

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Effects of nanotwins on the mechanical properties of Al x CoCrFeNi high entropy alloy thin films

Cited by 93 publications

References 34 publications

Plastic deformation transition in FeCrCoNiAlx high-entropy alloys

Plastic deformation transition in FeCrCoNiAlx high-entropy alloys

High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Thin films of AlCrFeCoNiCu high-entropy alloy by pulsed laser deposition

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Plastic deformation transition in FeCrCoNiAl_x high-entropy alloys

Plastic deformation transition in FeCrCoNiAl_x high-entropy alloys