Shock compression and spallation damage of high-entropy alloy Al0.1CoCrFeNi

Zhang, N.B.; Xu, Jingyu; Feng, Zhongxue; Sun, Yan-Yun; Huang, J.Y.; Zhao, Xiaojun; Yao, Xiongliang; Chen, S.; Lü, Lei; Luo, Sheng‐Nian

doi:10.1016/j.jmst.2022.02.056

Cited by 44 publications

(4 citation statements)

References 69 publications

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“…We summarize the dynamic behavior of CrCoNi-containing HEAs in fig. S8; most of the alloys express similar strain hardenability at elevated strain rates, indicating their excellent mechanical properties under extreme conditions ( 22 , 23 , 25 , 65 – 72 ). Note that the deformation and failure mechanisms demonstrated here are not necessarily unique to HEAs but rather to fcc metals and alloys with a low SFE (which of course includes many fcc MEA/HEAs).…”

Section: Resultsmentioning

confidence: 95%

“…Note that the deformation and failure mechanisms demonstrated here are not necessarily unique to HEAs but rather to fcc metals and alloys with a low SFE (which of course includes many fcc MEA/HEAs). For example, some austenitic steels (e.g., 304 and 316 stainless) can achieve a dynamic strength that is as high, if not higher than, the CrCoNi MEA ( 25 ). These alloys are also chemically complex owing to the similar choice of alloying elements to the fcc HEAs.…”

Section: Resultsmentioning

confidence: 99%

“…It was also found that hydrogen can delay the spall failure of this alloy ( 24 ). Zhang et al ( 25 ) recently studied the spallation, i.e., failure of materials under dynamic tensile loads, of the Al 0.1 CoCrFeNi HEA using a plate impact technique and suggested that the material can display a high spall strength (up to 4 GPa) with marked strain rate sensitivity. Microstructurally, HEA/MEAs in general exhibit extremely versatile deformation mechanisms at elevated strain rates, including dislocation-mediated plasticity, twinning, phase transition, and, in extreme, solid-state amorphization ( 26 ).…”

Section: Introductionmentioning

confidence: 99%

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Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

et al. 2023

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The extraordinary work hardening ability and fracture toughness of the face-centered cubic (fcc) high-entropy alloys render them ideal candidates for many structural applications. Here, the deformation and failure mechanisms of an equiatomic CrCoNi medium-entropyalloy (MEA) were investigated by powerful laser-driven shock experiments. Multiscale characterization demonstrates that profuse planar defects including stacking faults, nanotwins, and hexagonal nanolamella were generated during shock compression, forming a three-dimensional network. During shock release, the MEA fractured by strong tensile deformation and numerous voids was observed in the vicinity of the fracture plane. High defect populations, nanorecrystallization, and amorphization were found adjacent to these areas of localized deformation. Molecular dynamics simulations corroborate the experimental results and suggest that deformation-induced defects formed before void nucleation govern the geometry of void growth and delay their coalescence. Our results indicate that the CrCoNi-based alloys are impact resistant, damage tolerant, and potentially suitable in applications under extreme conditions.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

et al. 2023

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“…In this study, the dynamic tensile strength, represented by the spall strength σ 𝑠𝑠𝑝𝑝 , can be determined either indirectly from the history of the free surface velocity 𝑣𝑣 𝑓𝑓𝑠𝑠 or directly from the bulk material in MD simulations [26]. An indirect method, which relies on the acoustic approximation, is commonly utilized in experiments [45] to measure the spall strength using the formula σ 𝑠𝑠𝑝𝑝 = 0.5𝜌𝜌 0 𝑐𝑐 0 ∆𝑣𝑣 𝑓𝑓𝑠𝑠 . Here, 𝜌𝜌 0 represents the material density, 𝑐𝑐 0 denotes the sound speed, and ∆𝑣𝑣 𝑓𝑓𝑠𝑠 indicates the pullback velocity in 𝑣𝑣 𝑓𝑓𝑠𝑠 profiles.…”

Section: Spall Strengthmentioning

confidence: 99%

Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co25Ni25Fe25Al7.5Cu17.5

Wu,

Shao

2023

Nanomaterials

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Shock-induced plastic deformation and spall damage in the single-crystalline FCC Co25Ni25Fe25Al7.5Cu17.5 high-entropy alloy (HEA) under varying shock intensities were systematically investigated using large-scale molecular dynamics simulations. The study reveals the significant influence of crystalline orientation on the deformation mechanism and spall damage. Specifically, the shock wave velocities in the [110] and [111] directions are significantly higher than that in the [001] direction, resulting in a two-zone elastic-plastic shock wave structure observed in the [110] and [111] samples, while only a single-wave structure is found in the [001] sample. The plastic deformation is dominated by the FCC to BCC transformation following the Bain path and a small amount of stacking faults during the compression stage in the [001] sample, whereas it depends on the stacking faults induced by Shockley dislocation motion in the [110] and [111] samples. The stacking faults and phase transformation in the [001] sample exhibit high reversibility under release effects, while extensive dislocations are present in the [110] and [111] samples after release. Interestingly, tension-strain-induced FCC to BCC phase transformation is observed in the [001] sample during the release stage, resulting in increased spall strength compared to the [110] and [111] samples. The spall strength estimated from both bulk and free surface velocity history shows reasonable consistency. Additionally, the spall strength remains stable with increasing shock intensities. The study discusses in detail the shock wave propagation, microstructure change, and spall damage evolution. Overall, our comprehensive studies provide deep insights into the deformation and fracture mechanisms of Co25Ni25Fe25Al7.5Cu17.5 HEA under shock loading, contributing to a better understanding of dynamic deformation under extreme environments.

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Mechanical response, deformation and damage mechanisms in dual-phase cobalt upon plate impact

Chen,

Cai,

Chen

et al. 2024

J Mater Sci

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Shock compression and spallation damage of high-entropy alloy Al0.1CoCrFeNi

Cited by 44 publications

References 69 publications

Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co25Ni25Fe25Al7.5Cu17.5

Mechanical response, deformation and damage mechanisms in dual-phase cobalt upon plate impact

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