Gradient hierarchical microstructure

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August undefined, 2024

WebApr 10, 2024 · The effect of gradient microstructure induced by pre-torsion on mechanical properties of alloys have widely been investigated, concentrating on the comparison between gradient-structured alloys and coarse/fine-grained alloys. ... Simultaneously enhancing strength and ductility of a high-entropy alloy via gradient hierarchical … WebGradient metals have emerged as a class of hierarchical materials with tunable distribution of microstructures (4–8). As a result of the substantial strain gradients ( 9 – 13 ) intrinsic to these materials, gradient metals could be designed to exhibit an unusual combination of high strength and hardness, considerable ductility, and enhanced ...

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WebSep 23, 2024 · To process HEA dog-bone–shaped bar specimens with a gauge diameter of 4.5 mm and a gauge length of 12 mm, we used a cyclic torsion (CT) treatment without surface tooling to form a sample-level multiscaled hierarchical dislocation structure under the imposed spatially gradient plastic strains from the surface to the core (fig. S1).By … howlett building

Simultaneously enhancing strength and ductility of a high

WebMar 4, 2024 · Surprisingly, this multileveled gradient composite hydrogel repairs osteochondral unit in a perfect heterogeneous feature, which mimics the gradual cartilage-to-subchondral transition. Collectively, this is the first study that combines an adaptable hydrogel with magneto-driven MagHA gradients to achieve promising outcomes in … WebAn active surface with an on-demand tunable topography holds great potential for various applications, such as reconfigurable metasurfaces, adaptive microlenses, soft robots and four-dimensional (4D) printing. Despite extensive progress, to achieve refined control of microscale surface structures with large-amplitude deformation remains a challenge. … WebJun 14, 2024 · The microstructure was examined both using an optical microscope (OPTIKA-600) and a scanning electron microscope (SEM; JEOL JSM-6490LA and … howlett building cafeteria

Microstructural evolution and mechanical characterization …

Microstructure evolution and formation of gradient …

WebMar 31, 2024 · Hierarchical Lattice Modeling Method with Gradient Functions Lattice structure materials have great application potential in biomedical, aerospace, and other … Webhierarchical grain size gradient micro structure with a high nanotwins population . This was achieved by means of rotationally accelerated shot peening (RASP). howlett building springfield addressWeb1.3.7 Gradient systems and (non-)recurrence. Gradient systems form a class of a somewhat different nature: these systems cannot be defined in terms of a structure … howlett building springfield il address

"WebSep 19, 2014 · The gradient microstructure allows various plastic deformation mechanisms of largely different microstructures to be activated concurrently. This … " - Gradient hierarchical microstructure

Gradient hierarchical microstructure

Achieving a unique combination of strength and ductility in

WebFeb 17, 2024 · In this sense, twins, stacking faults, texture, and the particles could all serve as extra dimensions other than grain size when building the gradient microstructures. However, to date, the emphasis of the gradient design has been placed, in most cases, on the size of grains and the thickness/density of twins [Citation 3–15, Citation 17–19 ... WebJul 1, 2024 · Development of a thin deformed layer and an undeformed core, connected by a gradient hierarchical microstructure 36 in a HEA was also shown to improve ductility, but with only a small ...

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WebDec 17, 2024 · The gradient microstructure exhibits a good thermal stability at 400 °C. No obvious grain/subgrain size variation is displayed except for a decrease of dislocation density. It indicates that recovery takes place during annealing at 400 °C. A hierarchical microstructure is formed after annealing at 600 °C. WebFeb 25, 2024 · Gradient microstructure in a structure of increasing grain size from surface to inside is confirmed to play a positive role in improving mechanical properties [22]. In …

WebSep 22, 2024 · Moreover, gradient structures (GSs) have been shown to be effective in alleviating the strength-ductility trade-off although strength and ductility are mutually … WebDec 1, 2024 · This study investigated HE of pure iron with gradient microstructure induced by pre-torsion. The results reveal that with an increase in pre-torsion angle, the …

WebSurface gradient. In vector calculus, the surface gradient is a vector differential operator that is similar to the conventional gradient. The distinction is that the surface gradient … WebApr 26, 2024 · Gradient structured materials have attracted considerable attention among material scientists because of their excellent mechanical and functional properties. Here, …

WebAlong the thickness direction, there exist gradient microstructures , such as gradients in twin and dislocation densities, and ... After annealing, the multiphase hierarchical microstructure features non-recrystallized regions, partial recrystallized regions with fine (3 ± 2 μm) and coarse (14 ± 3 μm) grains, and hierarchical distribution ...

WebGradient. The gradient, represented by the blue arrows, denotes the direction of greatest change of a scalar function. The values of the function are represented in greyscale and … howlett car repairWebThe effects of temperature gradient, scan rate and initial solid-phase morphology on solute concentration, dendrite spacing and dendrite morphology were analyzed and compared with experimental results for verification. ... This paper is expected to provide a theoretical support for the effective regulation of solidification microstructure in ... howlett building springfieldWebJun 2, 2024 · Here, we report a heterogeneous gradient structure (HGS) in this MEA produced by ultrasonic surface rolling processing that can achieve a unique property combination: 3.7 times higher engineering yield strength compared to that of the fully recrystallized microstructure with homogeneous grain size, and at the same time … howlett clarke brightonWebNov 30, 2024 · Gradient and hierarchical structure Mechanical property Deformation mechanism 1. Introduction High entropy alloys (HEAs) are developed for achieving high strength through ultimate solid solution strengthening [1]. These alloys are single-phase … Figure 1 a and d shows the typical SEM planar morphologies of the two as … howlett clarke cushmanWebSep 1, 2024 · Gradient hierarchical microstructures produced by DT are investigated using electron backscattered diffraction, transmission electron microscopy, and nanoindentation tests. Based on the gradient ... howlett clarkeWebDec 1, 2024 · This work indicates that simultaneous enhancement in strength and work hardening can be achieved by solely increasing the structural gradient in pure Cu, and … howlett building springfield ilWebMay 20, 2024 · We expected a common sensory–fugal gradient to define microstructural and functional organisation, but we also hypothesised that local differences would signify weaker hierarchical constraints in areas … howlett clarke solicitors