Achieving room-temperature brittle-to-ductile transition in ultrafine layered Fe-Al alloys

Li, Lulu; Su, Yanqing; Beyerlein, Irene J.; Han, Wei‐Zhong

doi:10.1126/sciadv.abb6658

Cited by 35 publications

(13 citation statements)

References 48 publications

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“…The very early stage of thermally-activated ordering is referred to as chemical shortrange order (CSRO) [13][14][15] , the occurrence of which has been reported to significantly change the mechanical [4][5][6][16][17][18][19][20][21] and functional 1,2,22 performances of materials. Fe-Al alloys, lightweight materials with excellent strength and corrosion/wear resistance, are good candidates for theoretical studies on such ordering transformations 2,23,24 . Undeformed Fe-Al alloys with compositions close to the boundary of the disorder-order transition, annealed at a relatively low temperature (e.g.…”

Section: Mainmentioning

confidence: 99%

Quantitative three-dimensional imaging of chemical short-range order via machine learning enhanced atom probe tomography

Wang

et al. 2022

Preprint

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Chemical short-range order (CSRO) refers to atoms of specific elements self-organising within a disordered crystalline matrix. These particular atomic neighbourhoods can modify the mechanical and functional performances of materials 1-6. CSRO is typically characterized indirectly, using volume-averaged (e.g. X-ray/neutron scattering) 2,7,8 or through projection (i.e. two-dimensional) microscopy techniques 5,6,9,10 that fail to capture the complex, three-dimensional atomistic architectures. Quantitative assessment of CSRO and concrete structure-property relationships remain unachievable. Here, we present a machine-learning enhanced approach to break the inherent resolution limits of atom probe tomography to reveal three-dimensional analytical imaging of the size and morphology of multiple CSRO. We showcase our approach by addressing a long-standing question encountered in a body-centred-cubic Fe-18Al (at.%) solid solution alloy that sees anomalous property changes upon heat treatment 2. After validating our method against artificial data for ground truth, we unearth non-statistical B2-CSRO (FeAl) instead of the generally-expected D03-CSRO (Fe3Al) 11,12. We propose quantitative correlations among annealing temperature, CSRO, and the nano-hardness and electrical resistivity, supported by atomistic simulations. The proposed strategy can be generally employed to investigate short/medium/long-range ordering phenomena in a vast array of materials and help design future high-performance materials.

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Section: Mainmentioning

confidence: 99%

Quantitative three-dimensional imaging of chemical short-range order via machine learning enhanced atom probe tomography

Wang

et al. 2022

Preprint

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“…In 2019, Chang'E-4 (CE-4) landed on the eastern floor of Von Kármán crater on the far side of the moon. The Yutu-2 rover of CE-4 mission carried an LPR with the same configuration as CE-3 (e.g., Li et al 2020;Lai et al 2019;Ding et al 2020). The LPR is an ultra-wideband carrier-free pulse radar with two channels.…”

Section: Introductionmentioning

confidence: 99%

“…The LPR is an ultra-wideband carrier-free pulse radar with two channels. The first channel installed on the back of the rover operates at a center frequency of 60 MHz with a bandwidth of 40 MHz, while the second channel installed on the underside of the rover works at a center frequency of 500 MHz with a bandwidth of 500 MHz (Zhang et al 2014;Li et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties and stratigraphy of regolith in the lunar South Pole-Aitken basin: Observations from the Lunar Penetrating Radar

Feng

Siegler

White

2022

A&A

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Aims. We examine data obtained by the Lunar Penetrating Radar (LPR) onboard the Chang'E-4 (CE-4) mission to study the dielectric properties and stratigraphy of lunar regolith on the far side of the Moon. Methods. The data collected from January 2019 to September 2020 were processed to generate a 540 m radargram. The travel velocity of the radar signal and the permittivity of the regolith were deduced from hyperbolas in the radargram. As CE-4 LPR detected distinct planar reflectors, we evaluated the dielectric loss from the maximum penetration depth based on the radar equation. The derived dielectric properties are compared with the measurements of Apollo samples and Chang'E-2 microwave radiometer observations. Results. The results suggest that regolith at the landing site has a permittivity of 2.64–3.85 and a loss tangent of 0.0032–0.0044, indicating that the local regolith is composed of a fine-grained, low-loss material that is much more homogeneous than that found at the Chang’E-3 landing site. The total thickness of weathered material is ~40m, with several regolith layers and a buried crater identified in the reconstructed subsurface structure. Conclusions. These layers clearly record a series of impact events from the adjacent regions. We suggest that the top layer is primarily made up of the ejecta from a large crater 140 km away. In contrast, the material source of other thinner layers comes from nearby smaller craters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric properties and stratigraphy of regolith in the lunar South Pole-Aitken basin: Observations from the Lunar Penetrating Radar

Feng,

Siegler,

White

2022

Preprint

View full text Add to dashboard Cite

Aims. We examine data obtained by the Lunar Penetrating Radar (LPR) onboard the Chang'E-4 (CE-4) mission to study the dielectric properties and stratigraphy of lunar regolith on the far side of the Moon. Methods. The data collected from January 2019 to September 2020 were processed to generate a 540 m radargram. The travel velocity of the radar signal and the permittivity of the regolith were deduced from hyperbolas in the radargram. As CE-4 LPR detected distinct planar reflectors, we evaluated the dielectric loss from the maximum penetration depth based on the radar equation. The derived dielectric properties are compared with the measurements of Apollo samples and Chang'E-2 microwave radiometer observations. Results. The results suggest that regolith at the landing site has a permittivity of 2.64-3.85 and a loss tangent of 0.0032-0.0044, indicating that the local regolith is composed of a fine-grained, low-loss material that is much more homogeneous than that found at the Chang'E-3 landing site. The total thickness of weathered material is ∼ 40 m, with several regolith layers and a buried crater identified in the reconstructed subsurface structure. Conclusions. These layers clearly record a series of impact events from the adjacent regions. We suggest that the top layer is primarily made up of the ejecta from a large crater 140 km away. In contrast, the material source of other thinner layers comes from nearby smaller craters.

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Achieving room-temperature brittle-to-ductile transition in ultrafine layered Fe-Al alloys

Cited by 35 publications

References 48 publications

Quantitative three-dimensional imaging of chemical short-range order via machine learning enhanced atom probe tomography

Quantitative three-dimensional imaging of chemical short-range order via machine learning enhanced atom probe tomography

Dielectric properties and stratigraphy of regolith in the lunar South Pole-Aitken basin: Observations from the Lunar Penetrating Radar

Dielectric properties and stratigraphy of regolith in the lunar South Pole-Aitken basin: Observations from the Lunar Penetrating Radar

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