The analog memristive switching of iron oxide (γ-Fe2O3) nanoparticle assembly was investigated. γ-Fe2O3 nanoparticles were chemically synthesized with ∼10 nm in diameter and assembled to be a continuous layer as element Pt/nanoparticles/Pt structure. It exhibited the that resistance decreased sequentially repeating −V sweeps pulses while increased applying +V. capacitance-voltage curves presenting hysteresis flatband voltage shift distortion their shapes respect applied supported...

Magnesium (Mg) alloys have a low density among the structural metals, but it is hard to be plastically deformed due their crystallographic nature. Wire arc additive manufacturing (WAAM) could one of alternative processes fabricate Mg products for various industrial applications. Nonetheless, used in limited fields challenging issues such as commercial availability wire, high oxygen affinity, explosive and flammable hazard, typical defects WAAM like distortion side collapse, grain coarsening,...

Generally, molds are fabricated by the machining of massive billets tool steels, such as AISI4140 or H13, but it has drawbacks, a large material loss and long-delivery time. The Wire-Arc Additive Manufacturing (WAAM) process could be an alternative fabrication method. It advantages less loss, short-delivery time, chance to make reinforced mold using dissimilar materials. 5 Cr – 4 Mo steel wire high potential produce via WAAM process. This is commercial solid initially designed for repair...

The use of titanium and its alloys is increasing day by day, especially in aerospace, automobile, defense fields. Friction stir welding a prominent solid-state joining process, which produces non-melting low heat input welds with less residual stresses compared to the conventional process. physical chemical properties Ti such as thermal expansion conductivity, relatively high melting temperature(1668°C) reactivity makes FSW favorable process for alloys. However, friction reveal highly...

Owing to global trends, automation with the fourth industrial revolution, and environmentally friendly policies owing certified emission reduction, wire arc additive manufacturing (WAAM) is attracting attention in various fields. In addition, demands of non-ferrous metals such as aluminum magnesium alloys are from industries that require lightweight, large, complex metallic parts can be fabricated through WAAM. this study, (AM), WAAM, current issues on WAAM particularly discussed.

This study observed the effect of filler metal type on mechanical properties NAB (NiAl-bronze) material fabricated using wire arc additive manufacturing (WAAM) technology. The selection is must consider field condition, required by customers, and economics. analyzed bead shape for representative two kind types use to maintenance a two-dimensional bulk material. cold transfer (CMT) mode gas welding (GMAW) was used. For comparison properties, obtained three specimens per direction from In...

The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed compared with those Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (RBM) dual-beam-mode (DBM) laser welding. Dilution coating in FZ induced α-ferrite formation during hot stamping. After stamping, fraction decreased (from 23 vol% to 4.27 vol%) more than that center-beam-mode (CBM)...

Magnesium (Mg) alloys are the lightest structural metallic material, but it is hard to be applied various industrial fields due crystallographic nature that composed with hexagonal closed packed (HCP). Wire arc additive manufacturing (WAAM) could a key fabricating Mg parts large sizes and complex designs. It has numerous advantages such as high material efficiency, short-delivery time by faster speed, easy modify, etc. Yet, most of research mentioned grain coarsening degradation in...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Jin-Yong Lee, Jae-Deuk Kim, Yoon-Jae Baek, Young Jin Choi, Chi Jung Kang, Hyun Ho Tae-Sik Yoon; Voltage-dependent resistive switching characteristics in mixed layer consisting of γ-Fe2O3 Pt-Fe2O3 core-shell nanoparticles. Appl. Phys. Lett. 3 March 2014; 104 (9): 093514. https://doi.org/10.1063/1.4868015...

Die casting molds for aluminum are fabricated using machining billets of tool steels, such as Cr-Mo steel. However, this approach has several limitations, including significant material loss and a long lead time. Wire arc additive manufacturing (WAAM) is an alternative fabrication method that yields low short WAAM involves the repetitive stacking layers based on designed paths CAD/CAM. Thus, predictability uniformability each layer most important factors. The interpass distance parameter in...

This study entailed resistance spot welding conducted using 1.8 GPa-grade hot stamping boron steel heat-treated under varied conditions. The relationship between weldability and melting behavior of the intermetallic layer during was examined. As regards four heat treatment conditions beyond austenitic temperature, it found that thickened with increased time temperature. Furthermore, contact also temperature treatment. mainly because expansion area Al-Fe-based phases (e.g., FeAl2 Fe2Al5)...

We investigated the effects of DISC behavioral types on major recognition, satisfaction, and job preference among college students majoring in tourism. The survey period was from March 20 to April 15, 2020, 211 tourism were surveyed. results study are as follows. First, most frequent type behavior social-type I, highest with 41.7%. Second, there a statistically significant difference recognition according type. Among subject relationship high order D, C, S, environmental awareness C. Third,...

This study evaluated the effect of preheating on early stage melting behavior a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount heat was generated in Because generation, rapid collapse occurred and molten coating layer remained interface welded part. caused welding defects such as expulsion porosity. However, helped remove by pushing it out toward outer edge pool. suggests that can effectively minimize or within weld. Preheating also prevented partially...

The mechanical properties of commercially pure titanium can further be improved through the grain refinement processes; however, welding fine-grained materials is challenging due to coarsening in weld area and hence weakening locally. Meanwhile, friction stir a promising process which metallurgical bonding established solid-state mixing welded; no studies have reported ultra-fine-grained commercial purity date. In this research, (1.58 0.66 μm, respectively) was conducted. effect...

Resistive switching characteristics of maghemite (γ-Fe2O3) nanoparticle (NP) assembly were investigated in patterned array structure Pt/γ-Fe2O3/Pt on a flexible polyethylene terephthalate (PET) substrate. The NPs layer was formed through dip-coating process. cross-bar devices with sandwiched between Pt electrodes exhibited memristive hysteresis current-voltage gradually changing resistance respect to the bias conditions.

Magnesium (Mg) alloys have a low density among the structural metals, but it is hard to be plastically deformed due their crystallographic nature. Wire arc additive manufacturing (WAAM) could one of alternative processes fabricate Mg products for various industrial applications. Nonetheless, has not been yet barely used in fields challenging issues such as commercial availability wire, high oxygen affinity, explosive and flammable hazard, typical defects WAAM like distortion side collapse,...

The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed compared with those Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (RBM) dual-beam-mode (DBM) laser welding. Dilution coating in FZ induced α-ferrite formation during hot stamping. After stamping, fraction decreased (from 23 vol% to 4.27 vol%) more than that center-beam-mode (CBM)...