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The α-Cu solid solution phases between the Sn-rich phases after plastic deformation with and without annealing at 300 °C for 30 min were characterized and shown in Fig. 2.The α-Cu grains treated by RS shown in Fig. 2 (a2) exhibit an ultrafine lamellar structure with a high-angle grain boundary accounting for 49.3%. The grain refinement …
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Intrinsic high cycle fatigue behavior of ultrafine grained pure Cu with stable structure PengXue,ZhiyeHuang,BeibeiWang,YanzhongTian,WenguangWang,BolvXiaoandZongyiMa* ABSTRACT Ultrafine grained (UFG) materials have at-tracted considerable attention owing to their unique mi-
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@article{Cai2013GradientUF, title={Gradient ultrafine ferrite and martensite structure and its tensile properties by asymmetric rolling in low carbon microalloyed steel}, author={Minghui Cai and Satyaveer Singh Dhinwal and Qi-hang Han and Qi Chao and Peter D. Hodgson}, journal={Materials Science and Engineering A-structural Materials …
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The ultrafine grained duplex structure in 0.1C-5Mn was resulted from the the sluggish Mn-diffusion and the extra high Gibbs free energy of ferrite phase. Based on the analysis of the microstructure evolution, it was pointed out that the intercritical annealing of the medium-Mn steels could be applied to fabricate an ultrafine duplex grained ...
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Braided multi-electrode probes (BMEPs) for neural interfaces comprise ultrafine microwire bundles interwoven into tubular braids. BMEPs provide highly flexible probes and tethers, and an open lattice structure with up to 24 recording/stimulating channels in precise geometries, currently all within a …
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In summary, the ultrafine grains in micro-nano composite structures of 316L stainless steel are mainly obtained through three ways of as-cast structure nanocrystals reservation, deformation-induced martensite transformation and deformed austenite grain recovery and recrystallization. 3.3.2.
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The medium-Mn steel with ferrite and austenite structure was rolled in the intercritical region down to different rolling reduction. The microstructure and mechanical properties of the rolled steels were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and tensile tests. It was found that …
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Understanding the change in coal structure during heat treatment is the basis of efficient and clean utilization of coal. In this study, high-resolution transmission electron microscopy (HRTEM ...
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Unraveling the atomic structures of ultrafine iron clusters is critical to understanding their size-dependent catalytic effects and electronic properties. Here, we describe the stable close-packed ...
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Recent progress in ultrafine 3D Pd-based nanocubes with multiple structures for advanced fuel cells electrocatalysis. Author links open overlay panel Kewang Zhang a, Cheng Wang a, Fei Gao a, ... Generally, the special hollow nanocubes structure with outstanding structural advantages can play a great role in the field of electrocatalysis.
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Ultrafine fibers or fiber web is an attractive material for its high aspect ratio or porous structure which is welcomed in various applications. In this study, ultrafine fibers (5–10 μm) of styrene–acrylonitrile (SAN) copolymer/isotactic polypropylene (iPP) blends were produced by melt electrospinning, SAN acted as a polymeric nucleating ...
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That is, the ultrafine structure in the specimens annealed at the warm temperature around 500 °C is evolved mainly from the LDC structure in the cold-rolled specimens. When annealing temperature increases, the coarse grains with grain size of a few micrometers were observed in addition to the ultrafine grained microstructure.
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2.3. Preparation of HKLs-based ultrafine carbon fibers. HKLs ultrafine fibers were prepared using electrospinning method [9]. 2 g HKLs were first dissolved in 4 mL of DMF under magnetic stirring at 95 °C with a speed of 1200 rpm.Then, 0.02 g PEO was added into the solution and further continuously stirred for 12 h to improve the …
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Ultrafine-grained (UFG) materials are a new class of metals and alloys characterized by a microstructure with grain sizes less than 1 μm and nanostructural …
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Electrospinning of cellulose nanocrystals (CNC)/poly(lactic acid) (PLA) emulsions has been demonstrated to be an effective dispersion and alignment method to control assembly of CNC into continuous composite ultrafine fibers. CNC–PLA nanocomposite random-fiber mats and aligned-fiber yarns were prepared by emulsion …
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At ambient temperature, the rate of geological polymerization is extremely slow. The use of ultrafine metakaolin with smaller particle sizes will increase the reactivity of geopolymer and improve the strength of geopolymer, which is conducive to its application in practical engineering [24].Therefore, this experiment uses ultrafine metakaolin (UMK) …
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DOI: 10.2139/ssrn.4039388 Corpus ID: 247097909; Ultrafine Powder Coatings: Smooth Surface, Dense Structure and Enhanced Corrosion Resistance @article{Huang2022UltrafinePC, title={Ultrafine Powder Coatings: Smooth Surface, Dense Structure and Enhanced Corrosion Resistance}, author={Jin Bo Huang and Marshall …
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Ultrafine grained structure with an average grain size of 0.3 È m was uniformly evolved at the cumulative strain of ™ǻİ= 2.0. The multi-directionally forged Mg alloy up to ™ǻİ = 2.0 exhibited marvelous mechanical properties of 530 MPa in yield stress and 650 MPa in ultimate tensile strength with 9% plastic strain to fracture.
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The addition of (CoFeNi) on Ti 80 Cr 20−x (CoFeNi) x alloys destabilized β-Ti phase with precipitation of ω phase.. A large amount of (CoFeNi) induced ultrafine eutectic structure (UFES) composed of β-Ti and Ti 2 Ni-type Laves phases.. The nanoscale ω phase and UFES enhanced yield strength of the Ti 80 Cr 20−x (CoFeNi) x …
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Herein, an overview of the recent research on the relationship between the ultrafine-grained (UFG) structure of titanium and its alloys and the physical and mechanical properties of the materials, as well as the formation of advanced functional and service properties, including fatigue strength, creep behavior, and impact and fracture …
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Synthesis conditions were identified leading to agglomerates of nearly cylindrical zeolite nanocrystals with dimensions less than 50 nm in the channel direction and approximately 10 nm in diameter (in the direction perpendicular to the zeolite channels). The nanocrystals form agglomerates with approximate particle sizes ranging from 20 to …
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DOI: 10.1016/S0304-8853(02)00858-2 Corpus ID: 122668461; Magnetic properties of MnZn ferrite with ultra-fine grain structure @article{Moulin2003MagneticPO, title={Magnetic …
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Preparation of carbon fibers mats: Pyrolysis of ultrafine the fibers was performed in a tubular furnace (OTF-1200X, MIT Corporation) under the following conditions: room temperature to 300 °C (2 h in air flow, and then changed to Ar), 300–500 °C (2 h in Ar), 500–970 °C (1 h in Ar).The carbonized ultrafine fibers were activated with …
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Here, the formation of ultrafine ferrite (UFF) involves the dynamic transformation of a significant volume fraction of the austenite to ferrite. This dynamic strain induced transformation (DSIT) arises from the introduction of extensive intragranular nucleation sites that are not present in conventional controlled rolling.
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The outstanding electrochemical performance of UAPC is attributed to the ultrafine structure and N, O functional groups, which enlarges the surface area, improves the surface wettability of UAPC electrodes, and provides pseudocapacitance. The facile and efficient ultrafast-processing strategy has opened up an unprecedented pathway for the ...
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The further power spinning (FS) on the cylindrical parts with ultrafine-grained (UFG) structure was carried out to further improve the mechanical properties of the cylindrical parts. The forming quality and microstructural evolution of the spun parts made of ASTM1020 steel during FS were investigated. The results show that the forming quality …
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A simple process of 50% cold-rolled and annealed at different temperatures and times to obtain ultrafine-grained structured low-carbon steel with superior mechanical properties is utilized in this investigation. The microstructure evolves from bulky austenite to lathy martensite and then ultrafine ferrite grain with nanocarbide particles. Recovery …
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Ultrafine (≤ 10 nm) core-shell BaTiO 3 @SiO 2 (BT@SO) nanostructures are synthesized and proved to be superior fillers for high-energy density ceramic-polymer nanocomposite films.. Flexible and transparent BT@SO/PVDF nanocomposite films with outstanding energy storage performance (maximal U dis = 11.5 J/cm 3 at E b = 420 …
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Its ultrafine-grain structure enables 1.5 Gigapascal yield strength even for the fully recrystallized alloy with a single face-centered cubic structure. The high density of …
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The microstructure consists of homogenous dendritic structure with ultrafine size and spherical eutectic Si crystals with the diameter of about 50 nm. These factors increase microhardness (119 ± 8 HV) much higher than those made by conventional direct casting (DC) methods. As-spun ribbons also show high ultimate tensile strength (UTS) …
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