Although various catalytic materials have emerged for hydrogen evolution reaction (HER), it remains crucial to develop intrinsically effective catalysts with minimum uses of expensive and scarce precious metals. Metallic glasses (MGs) or amorphous alloys show up as attractive HER catalysts, but so far limited material forms compositions that result in high precious-metal loadings. Here, an Ir25 Ni33 Ta42 MG nanofilm exhibiting intrinsic activity superior stability at ultralow Ir loading 8.14...

Rail area detection is essential in active obstacle perception system of the train. This paper presents an efficient rail method based on convolutional neural network (CNN). The proposed divided into two main parts: extraction and further optimization. First, a CNN architecture established to achieve accurate detection, enabling pixel-level classification area. It notable that improvement our dilated cascade connection sampling. Second, improved polygon fitting applied optimize contour...

Polydiaminonaphthalene (PDAN) is an advanced conjugated polymer with a range of photothermal, chelating, and reducing properties by the virtue electron-donating groups in its molecular chain. In this study, situ polymerized PDAN nanoparticles were innovatively introduced into cellulose nanofiber (CNF)/polylactide (PLA)/PDAN hybrid aerogels formed CNF-stabilized Pickering emulsion gel, thus created multifunction aerogel capable silver ions during solar-driven interfacial evaporation as...

In bulk metallic glasses, minimizing the total electronic energy is a key factor in glass formation. However, it remains unclear how this minimized, particularly glasses made up of transition metal elements. study, we use synchrotron-based photoemission spectroscopy to investigate structure Ir–Ni–Ta–(B) which are primarily composed metals and have recently been discovered exhibit exceptional glass-forming ability. We observe distinct chemical shifts core levels Ir Ta opposite directions,...

Most metals and alloys suffer from high friction wear due to their low hardness lack of self-lubrication. Although plenty strategies have been proposed, it is still a long-standing challenge achieve diamond-like in metals. Metallic glasses (MGs) are supposed possess coefficient (COF) because fast surface mobility. However, rate larger than that materials. Here, this work reports the discovery Ta-rich MGs exhibit wear. This develops an indentation approach for high-throughput characterization...

Size effects are the main problem in micro-forming process and material behavior with miniaturization of feature size. In paper, size grain foil thickness on deformation fracture were investigated by using micro tensile test SUS304 foil. The results show that yield strength stainless increases decrease tests. Meanwhile, mechanism changes from ductile lots dimples to slip separation thickness. A compound model considering size, surface is proposed constitutive relation established....

Abstract Antibacterial activity and mechanical properties of FeCoCr-Ag medium entropy alloys were studied via combinatorial fabrication paired with high-throughput characterizations. It was found that the antibacterial exhibit non-linear dependence on content Ag addition. Within alloys, (FeCoCr) 80 20 possesses an optimized combination different for potential applications as coating materials. The underlying mechanism is ascribed to formation a dual-phase structure leads competition between...

Thermomechanical processing of metallic glasses can, remarkably, induce significant changes in structure and properties, even when the imposed macroscopic strains are well within elastic regime. The can take to higher-energy “rejuvenated” or lower-energy “aged” states, with rejuvenation being particular interest as it improves their mechanical properties. It has generally been assumed that induced property would evolve monotonically extent processing. We show sufficiently intense ultrasonic...

Substantial efforts in theoretical and experimental studies have demonstrated that the dynamics supercooled liquids is spatially heterogeneous. However, a complete description concerning dynamic heterogeneity evolution from liquid to rigid glass still lacking. Here, by combining study of static mechanical responses, we quantify characterization its temperature spanning an unprecedented broad range metallic glass. We show persists warm state into glassy becomes progressively pronounced with...

Peculiar temporal intermittent microscopic dynamics has been recently reported during structural relaxation in metallic glasses, though its origin is poorly understood. By using x-ray photon correlation spectroscopy, we have investigated the atomic motions a model system of glass with distinct stability and situ stress states. We find that can be tuned from dramatically nonmonotonous to monotonous. The always accompanied by activation secondary process, as indicated drop initial nonergodic...

Abstract High pressure has become a powerful platform for creating and controlling novel states of matter, including high temperature ( T c ) superconductivity. However, the emergent phenomena generally disappear as is removed cloud prospects future applications. Here, from distinguishing perspective, FeSe 1− x S reported 2D van der Waals materials with extraordinary high‐ at ambient pressure, where superconductivity boosted by extreme “chemical pressure” inside materials. Superior to...

Titanium alloys have been widely used in the aerospace industry because of their excellent properties, such as light weights, high strengths, and corrosion resistance. In this research, element diffusion between tungsten–cobalt cemented carbide Ti6Al4V was analyzed using thermodynamic solution theory. First, it observed that W, Co, Ti elements diffused under a temperature pressure. Then, by analyzing different elements, found amount depth W Co from increased with increases content WC grain...

The state of metastable equilibrium glass can carry an imprint the past and exhibit memory effect. As a hallmark glassy dynamics, effect affect behavior as it evolves further upon time. Even though physical picture has been well studied, is unclear whether recall many pieces information possible, if so, how will accordingly behave. We report that by fractionizing temperature interval, inserting multistep aging protocols, optimizing time each step, i.e., imposing ``training'' on prototypical...

Multilegged robots can adapt to complex terrains, an ability that is highly important for their research and development. To improve the adaptability fault tolerance of such robots, modular design concept applied by increase in number modules. A multilegged robot contains a trunk with six leg structures be removed at will. The interface legs achieve good tightness high strength, thereby ensuring quick disassembly will not fall off while walks. On this basis, gait different numbers designed....

In the process of metal cutting, cutting performance tools varies with different parameter combinations, so results indicators studied are also different. So in order to achieve best indicator it is necessary get matching combination. addition, value index at each stage processing process. consider more comprehensively, use a comprehensive evaluation method that can evaluate dynamic indicators. This paper uses considers change comprehensively tool parameters and level. For purpose high...

This study reviews the metal corrosion problem regarding carbon capture, utilization, and storage (CCUS) technology aims to deepen understanding research on this thus deal with severe material failures in transportation, systems.Based novel environments, uniqueness of behaviors, limited cognition, relative lack protective measures CCUS systems, analyzes possible types its major influencing factors, explores challenges it brings, draws following conclusions.For CO 2 organic amine capture...

In this work, squeeze casting experiments of flywheel housing components with a large wall thickness difference and complex shape were carried out AlSi9Mg aluminum alloy. The defects, microstructures, mechanical properties under different process parameters investigated. Furthermore, the local pressurization was applied to thick-walled positions force-feed cast defects. microstructures at these analyzed. results showed that surface quality formed good could effectively reduce shrinkage...