The design of Pd-containing high-entropy alloys and their hardening behavior under He ion irradiation

Shen, Shangkun; Hao, Liyu; Liu, Xing; Wang, Yufei; Li, Yingxi; Zhang, Jian; Fu, Engang

doi:10.1016/j.actamat.2023.119404

Cited by 23 publications

(5 citation statements)

References 60 publications

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“…Indeed, a recent experimental study ( 13 ) on equiatomic NiCoCrFeMn and NiCoCrFePd MPEAs found that alloying with Pd leads to a suppression of the growth of voids and dislocation loops. A strategy has also been reported to introduce additional lattice distortions and chemical heterogeneities using Pd alloying to improve the irradiation resistance of FeCrNiCo-system HEA in cases where irradiation defects are only caused by the aggregation of self-interstitials and vacancies ( 35 ). Such an experimental observation aligns well with the predictions in this work that the difference in diffusivities of the interstitials and vacancies would be reduced by the addition of Pd, which is expected to facilitate vacancy-interstitial recombination.…”

Section: Discussionmentioning

confidence: 99%

Minimizing the diffusivity difference between vacancies and interstitials in multi-principal element alloys

Zhang,

Xun

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Interstitial atoms usually diffuse much faster than vacancies, which is often the root cause for the ineffective recombination of point defects in metals under irradiation. Here, via ab initio modeling of single-defect diffusion behavior in the equiatomic NiCoCrFe(Pd) alloy, we demonstrate an alloy design strategy that can reduce the diffusivity difference between the two types of point defects. The two diffusivities become almost equal after substituting the NiCoCrFe base alloy with Pd. The underlying mechanism is that Pd, with a much larger atomic size (hence larger compressibility) than the rest of the constituents, not only heightens the activation energy barrier ( E a ) for interstitial motion by narrowing the diffusion channels but simultaneously also reduces E a for vacancies due to less energy penalty required for bond length change between the initial and the saddle states. Our findings have a broad implication that the dynamics of point defects can be manipulated by taking advantage of the atomic size disparity, to facilitate point-defect annihilation that suppresses void formation and swelling, thereby improving radiation tolerance.

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Section: Discussionmentioning

confidence: 99%

Minimizing the diffusivity difference between vacancies and interstitials in multi-principal element alloys

Zhang,

Xun

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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“…Such a hardening rate is terrific in radiation-resistant alloys. In Figure 4b, the material as a whole presents an indentation size effect with increasing depth and decreasing hardness [28,29]. At the early stage of indentation, due to the influence of the surface, the inverse indentation size effect will appear as the indentation depth becomes deeper [30].…”

Section: Nanoindentation Of the Alloy Before And After Irradiationmentioning

confidence: 96%

“…Under a fixed load, the maximum depth of the downward pressure of the nanoindentation indenter decreases continuously. This is due to the continuous raising of the irradiation dose, which leads to the increase in the irradiation defects of the sample, and the dislocation is difficult to move by pinning, which makes the hardness increase continuously [28,31]. Therefore, under the same load, the greater the irradiation dose, the shallower the indentation depth in the sample.…”

Section: Nanoindentation Of the Alloy Before And After Irradiationmentioning

confidence: 99%

Irradiation-Hardening Model of TiZrHfNbMo0.1 Refractory High-Entropy Alloys

Fan,

Wang,

et al. 2024

Entropy

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In order to find more excellent structural materials resistant to radiation damage, high-entropy alloys (HEAs) have been developed due to their characteristics of limited point defect diffusion such as lattice distortion and slow diffusion. Specially, refractory high-entropy alloys (RHEAs) that can adapt to a high-temperature environment are badly needed. In this study, TiZrHfNbMo0.1 RHEAs are selected for irradiation and nanoindentation experiments. We combined the mechanistic model for the depth-dependent hardness of ion-irradiated metals and the introduction of the scale factor f to modify the irradiation-hardening model in order to better describe the nanoindentation indentation process in the irradiated layer. Finally, it can be found that, with the increase in irradiation dose, a more serious lattice distortion caused by a higher defect density limits the expansion of the plastic zone.

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“…8.2 Irradiation Resistance High entropy alloys have also shown promising irradiation resistance, making them suitable for applications in nuclear reactors and other radiationintensive environments [96] [97]. Irradiation resistance is an important property for materials used in nuclear applications [98]. Due of their remarkable radiation resistance, high entropy alloys have attracted a lot of attention [99].…”

Section: Compression Strengthmentioning

confidence: 99%

Fabrication of High Entropy Alloy by Powder Metallurgy Process

B. Aravinth,

Geetha Arumugam,

R. Mayildurai

2024

Int Res J Adv Engg Hub

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Recently, High entropy alloys have attracted a lot of interest because of their unique properties. which include outstanding strength, remarkable corrosion resistance, and consistent thermal stability. Powder metallurgy is one of the production procedures commonly used to manufacture these alloys. Metal powders are compacted and sintered to create a cohesive material in the production process known as powder metallurgy. The capacity to produce a fine-grained microstructure and a homogeneous distribution of various elements are two benefits of this technology for the synthesis of high entropy alloys. Moreover, powder metallurgy makes it possible to precisely combine various alloying constituents, which can improve the qualities of high entropy alloys even more. Powder metallurgy allows for the manufacture of intricate shapes and dimensions, rendering it well-suited to a range of uses. With the use of powder metallurgy, high entropy alloys can be fabricated with improved mechanical properties and enhanced performance.

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The design of Pd-containing high-entropy alloys and their hardening behavior under He ion irradiation

Cited by 23 publications

References 60 publications

Minimizing the diffusivity difference between vacancies and interstitials in multi-principal element alloys

Minimizing the diffusivity difference between vacancies and interstitials in multi-principal element alloys

Irradiation-Hardening Model of TiZrHfNbMo0.1 Refractory High-Entropy Alloys

Fabrication of High Entropy Alloy by Powder Metallurgy Process

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