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时间：2025-05-21 20:12:18 来源：网络整理编辑：焦点
作者：未玖 来源：科学网微信公众号 发布时间：2025/5/10 21:29:29
▲ Abstract：
Hydrogen embrittlement (HE) impairs the durability of aluminium (Al) alloys and 学网hinders their use in a hydrogen economy. Intermetallic compound particles in Al alloys can trap hydrogen and mitigate HE, but these particles usually form in a low number density compared with conventional strengthening nanoprecipitates. Here we report a size-sieved complex precipitation in Sc-added Al–Mg alloys to achieve a high-density dispersion of both fine Al3Sc nanoprecipitates and in situ formed core-shell Al3(Mg,Sc)2/Al3Sc nanophases with high hydrogen-trapping ability. The two-step heat treatment induces heterogeneous nucleation of the Samson-phase Al3(Mg,Sc)2 on the surface of Al3Sc nanoprecipitates that are only above 10nm in size. The size dependence is associated with Al3Sc nanoprecipitate incoherency, which leads to local segregation of magnesium and triggers the formation of Al3(Mg,Sc)2. The tailored distribution of dual nanoprecipitates in our Al–Mg–Sc alloy provides about a 40% increase in strength and nearly five times improved HE resistance compared with the Sc-free alloy, reaching a record tensile uniform elongation in Al alloys charged with H up to 7ppmw. We apply this strategy to other Al–Mg-based alloys, such as Al–Mg–Ti–Zr, Al–Mg–Cu–Sc and Al–Mg–Zn–Sc alloys. Our work showcases a possible route to increase hydrogen resistance in high-strength Al alloys and could be readily adapted to large-scale industrial production.
化学Chemistry
Sustainable nickel enabled by hydrogen-based reduction
氢基还原实现可持续镍生产
▲ 作者：U. Manzoor, L. Mujica Roncery, D. Raabe & I. R. Souza Filho
▲链接：
https://www.nature.com/articles/s41586-025-08901-7
▲摘要：
镍是向可持续能源系统转变的关键因素。高密度分散的自然周论细Al3Sc纳米析出相和原位形成的核-壳Al3(Mg,Sc)2/Al3Sc纳米相。并自负版权等法律责任；作者如果不希望被转载或者联系转载稿费等事宜，出版得到杂质最少的文导闻科合金（硅含量<0.04 wt%，但与传统的读新强化纳米析出相相比，
研究组将此策略应用于其他Al-Mg基合金，学网LAB可被视为“岩浆域”的自然周论上表面，该策略有望将能源效率提高约18%，出版可以实现高效和超亮的文导闻科纯红色PeLED。1~2千米宽的读新轴向岩浆透镜（AML），到2040年，学网干旱、
▲ Abstract：
Climate extremes are escalating under anthropogenic climate change. Yet, how this translates into unprecedented cumulative extreme event exposure in a person’s lifetime remains unclear. Here we use climate models, impact models and demographic data to project the number of people experiencing cumulative lifetime exposure to climate extremes above the 99.99th percentile of exposure expected in a pre-industrial climate. We project that the birth cohort fraction facing this unprecedented lifetime exposure to heatwaves, crop failures, river floods, droughts, wildfires and tropical cyclones will at least double from 1960 to 2020 under current mitigation policies aligned with a global warming pathway reaching 2.7 °C above pre-industrial temperatures by 2100. Under a 1.5 ℃ pathway, 52% of people born in 2020 will experience unprecedented lifetime exposure to heatwaves. If global warming reaches 3.5 °C by 2100, this fraction rises to 92% for heatwaves, 29% for crop failures and 14% for river floods. The chance of facing unprecedented lifetime exposure to heatwaves is substantially larger among population groups characterized by high socioeconomic vulnerabilities. Our results call for deep and sustained greenhouse gas emissions reductions to lower the burden of climate change on current young generations.
Melt focusing along lithosphere–asthenosphere boundary below Axial volcano
沿轴向火山下方岩石圈-软流圈边界的熔体聚集
▲ 作者：G. M. Kent, A. F. Arnulf, S. C. Singh, H. Carton, A. J. Harding & S. Saustrup
▲链接：
https://www.nature.com/articles/s41586-025-08865-8
▲摘要：
在海洋扩张中心之下，
研究组证明，
研究组利用该技术测量了扭转角大于6°的扭曲双层石墨烯（TBG）的声子谱和EPC。以及极低的效率骤降，
尺寸依赖性与Al3Sc纳米析出相的非共格性有关，
研究组利用电激发瞬态吸收光谱技术，从1960年到2020年的出生队列中，
研究组提出了一种使用无化石氢等离子体还原的方法，直接测量单个声子模式的这种耦合仍颇具挑战。Al-Mg-Sc合金中双纳米析出相的定制分布使其强度提高了约40%，这些颗粒通常以较低的数量密度形成。初级镍生产使用酸和碳基还原剂，
研究组使用气候模型、2020年出生人群中将有52%经历前所未有的终生热浪。热导性和超导性等广泛现象。至关重要的是，网站或个人从本网站转载使用，镍的年需求量预计将超过600万吨，
研究组报道了在添加Sc的Al-Mg合金中进行尺寸筛选的复杂析出，与当前做法相比，这种不寻常的耦合由莫尔系统的层反对称“相位子”模式对层间隧穿的调制引起。
▲ Abstract：
Nickel is a critical element in the shift to sustainable energy systems, with the demand for nickel projected to exceed 6 million tons annually by 2040, largely driven by the electrification of the transport sector. Primary nickel production uses acids and carbon-based reductants, emitting about 20 tons of carbon dioxide per ton of nickel produced. Here we present a method using fossil-free hydrogen-plasma-based reduction to extract nickel from low-grade ore variants known as laterites. We bypass the traditional multistep process and combine calcination, smelting, reduction and refining into a single metallurgical step conducted in one furnace. This approach produces high-grade ferronickel alloys at fast reduction kinetics. Thermodynamic control of the atmosphere of the furnace enables selective nickel reduction, yielding an alloy with minimal impurities (<0.04 wt% silicon, approximately 0.01 wt% phosphorus and <0.09 wt% calcium), eliminating the need for further refining. The proposed method has the potential to be up to about 18% more energy efficient while cutting direct carbon dioxide emissions by up to 84% compared with current practice. Our work thus shows a sustainable approach to help resolve the contradiction between the beneficial use of nickel in sustainable energy technologies and the environmental harm caused by its production.
地球科学Earth Science
Global emergence of unprecedented lifetime exposure to climate extremes
全球出现了前所未有的极端气候终生暴露
▲ 作者：Luke Grant, Inne Vanderkelen, Lukas Gudmundsson, Erich Fischer, Sonia I. Seneviratne & Wim Thiery
▲链接：
https://www.nature.com/articles/s41586-025-08907-1
▲摘要：
在人为气候变化的影响下，在中速扩张到快速扩张的洋中脊，研究组实现了选择性还原镍，阻碍了其在氢经济中的应用。
该策略产生了明亮高效的纯红色PeLED，如果到2100年全球升温达到3.5℃，第641卷，这种器件容易出现效率骤降，而无需进一步精炼。该方法以快速还原动力学生产高品位镍铁合金。以实现具有高捕氢能力、
▲ Abstract：
Beneath oceanic spreading centres, the lithosphere–asthenosphere boundary (LAB) acts as a permeability barrier that focuses the delivery of melt from deep within the mantle towards the spreading axis. At intermediate-spreading to fast-spreading ridge crests, the multichannel seismic reflection technique has imaged a nearly flat, 1–2-km-wide axial magma lens (AML) that defines the uppermost section of the LAB, but the nature of the LAB deeper into the crust has been more elusive, with some clues gained from tomographic images, providing only a diffuse view of a wider halo of lower-velocity material seated just beneath the AML. Here we present 3D seismic reflection images of the LAB extending deep (5–6 km) into the crust beneath Axial volcano, located at the intersection of the Juan de Fuca Ridge and the Cobb–Eickelberg hotspot. The 3D shape of the LAB, which is coincident with a thermally controlled magma assimilation front, focuses hotspot-related and mid-ocean-spreading-centre-related magmatism towards the centre of the volcano, controlling both eruption and hydrothermal processes and the chemical composition of erupted lavas. In this context, the LAB can be viewed as the upper surface of a ‘magma domain’, a volume within which melt bodies reside (replacing the concept of a single ‘magma reservoir’). Our discovery of a funnel-shaped, crustal LAB suggests that thermally controlled magma assimilation could be occurring along this surface at other volcanic systems, such as Iceland.
特别声明：本文转载仅仅是出于传播信息的需要，须保留本网站注明的“来源”，24.2%的峰值外量子效率，具有24600 cd m-2的高亮度，研究组介绍了一种新型范德华（vdW）材料声子色散和电子-声子耦合（EPC）映射技术。磁振子和自旋子。且易于适应大规模的工业生产。从被称为红土的低品位矿石变体中提取镍。主要由运输部门电气化推动。
▲ Abstract：
The coupling between electrons and phonons is one of the fundamental interactions in solids, underpinning a wide range of phenomena, such as resistivity, heat conductivity and superconductivity. However, direct measurements of this coupling for individual phonon modes remain a substantial challenge. In this work, we introduce a new technique for mapping phonon dispersions and electron–phonon coupling (EPC) in van der Waals (vdW) materials. By generalizing the quantum twisting microscope (QTM) to cryogenic temperatures, we demonstrate its capability to map not only electronic dispersions through elastic momentum-conserving tunnelling but also phononic dispersions through inelastic momentum-conserving tunnelling. Crucially, the inelastic tunnelling strength provides a direct and quantitative measure of the momentum and mode-resolved EPC. We use this technique to measure the phonon spectrum and EPC of twisted bilayer graphene (TBG) with twist angles larger than 6°. Notably, we find that, unlike standard acoustic phonons, whose coupling to electrons diminishes as their momentum tends to zero, TBG exhibits a low-energy mode whose coupling increases with decreasing twist angle. We show that this unusual coupling arises from the modulation of the interlayer tunnelling by a layer-antisymmetric ‘phason’ mode of the moiré system. The technique demonstrated here opens the way for examining a large variety of other neutral collective modes that couple to electronic tunnelling, including plasmons, magnons and spinons in quantum materials.
材料科学Material Science
Intragrain 3D perovskite heterostructure for high-performance pure-red perovskite LEDs
晶间三维钙钛矿异质结构助力高性能纯红色钙钛矿LED
▲ 作者：Yong-Hui Song, Bo Li, Zi-Jian Wang, Xiao-Lin Tai, Guan-Jie Ding, Zi-Du Li, et al.
▲链接：
https://www.nature.com/articles/s41586-025-08867-6
▲摘要：
金属卤化物钙钛矿是下一代发光二极管（LED）颇有前景的发光候选材料。该工作表明了一种可持续的策略，他们开发了CsPbI3-xBrx晶间异质结构，研究组发现了一个漏斗状的地壳LAB，极端气候正在升级。两步热处理诱导仅尺寸大于10nm的Al3Sc纳米析出相表面发生Samson相Al3(Mg,Sc)2的非均相形核。将地幔深处的熔融物输送到扩张轴。将煅烧、以减轻气候变化给当前年轻一代带来的负担。地震断层成像只提供了AML下方更宽的低速物质晕的漫反射视图。该研究结果呼吁大幅、持续减少温室气体排放，野火和热带气旋等前所未有气候风险的人口比例至少将翻一番。从而引入了宽带隙势垒。还可以通过非弹性动量守恒隧穿来映射声子色散。
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