Materials Literature
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Demands for medium carbon steels with high strength used for forging parts in automobile have been increasing. V addition to such steels leads to interphase boundary precipitation (IBP) of VC and thus an increase of strength. However, mechanism and strengthening effect of IBP have not been clarified in detail. In this…
This study attempts to incorporate the effect of elastic deformation in a previously proposedmodel for the nucleation and growth of precipitates. We adapt the KWN-model by Robson to incor-porate the effect of strain energy arising from elastic deformation on the homogeneous nucleation andgrowth of NbC particles in a H…
Significant increase of the previtamin D cis-trans isomerization efficiency with increased concentration of initial provitamin D was observed in both nematic and cholesteric LCs at room temperature, but the effect revealed reduced progressively with heating, and in isotropic phase it disappeared. The results obtained…
무주군 적상면 사산리에는 선캠브리아기 화강암질 편마암 복합체가 분포하고 이를 쥬라기 편암질 화강암과 페그마타이트가 관입하고 있으며, 페그마타이브 내 Nb-Ta 광화대가 발달하고 있다. 페그마타이트의 구성광물은 거정질의 석영, 장석류, 및 백운모가 우세하며 장석류는 정장석과 알바이트의 탄종성분을 보여준다. Nb-Ta 광물로는 콜럼바이트가 우세하며 백운모는 후기 마그마 기원으로 콜럼바이트와 밀접히 수반되어 산출한다. 조립의 콜럼바이트는 석영, 장석과 함께 산출하는 반면, 미립의 콜럼바이트는 백운모와 함께 산출하는데 조립질에 비해 미립의 콜럼바이트는 상대적으로 낮은 Nb…
Introduction With their ease of processing and high performance, polymeric materials have become a common and important part of modern life. However, because almost all polymers are composed predominately of hydrocarbons, these materials are flammable and thus greatly increase fire hazard to human life and property. A…
온실가스배출억제와 수입원유저감을 위하여 전 전기자동차의 도입이 활발하게 추진되고 있다. 이의 항속거리 연장을 위한 리튬이온 이차전지 소재와 공정개발 등의 연구개발 동향, 그리고 양산체제 구축 중에 있는 리튬이온 이차전지 메이커의 계획도 조사하였다. 완성차메이커와는 수평분업적인 협력관계가 형성되고 있음을 볼 수 있었다. The production capacity of EV models should be sufficient to achieve the goal of one million EVs by 2015. Large-Format lithium-ion battery a…
Introduction The term “nanocomposite” is widely used to describe a very broad range of materials, where one of the phases has a submicrometer dimension . In the case of polymer-based nanocomposites, this typically involves the incorporation of “nano” fillers with one (platelets), two (fibers, tubes), or all three dime…
World consumers are now focusing on their health, well-being and appearance more than ever before. This trend is creating heightened demand for products formulated as cosmeceuticals with active ingredients. A significant number of innovative formulations are now being used in cosmetics with real consumer-perceivable b…
This paper presents mechanical behavior of a functionally graded (FG) cantilever micro-beam subjected to a nonlinear electrostatic pressure and thermal moment considering effects of material length scale parameters. Material properties through the beam thickness direction are graded. The top surface of the micro-beam…
This paper reports the production and weldability and toughness evaluation of TiB2 (ceramic particles) reinforced steel matrix composites. These ceramic particles are optimal reinforcements for steel matrix composites because of their high thermal stability at higher temperatures, high modulus of elasticity, good weld…
By applying the non-equilibrium Green's function (NEGF) technique, the Landauer–Buttiker theory and the Fisher–Lee formula, we have investigated the transport behavior of a C60– n X n (X=N, B) molecule coupled to two semi-infinite SWCNT electrodes. In this study, the coupling through the carbon, boron and nitrogen ato…
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Ferrite growth behavior in Fe-C-Mn alloys has been studied using controlled decarburization experiments. Two types of kinetic transition are considered. A first transition is proposed which involves a change from ParaEquibrium (PE) contact conditions at short times to Local-Equilibrium with Negligible Partitioning at…
2-Chloroethylisocyanate has been studied in a thorough way. NMR, Raman, FTIR, and Ar-matrix vibrational spectra of the molecule are presented and discussed with the complement of ab initio and DFT methods. The spectroscopic results reveal the existence of anti and gauche conformers that are equally populated in the ga…
A Fe50Pd50 alloy was severely deformed by High Pressure Torsion (HPT). For a processing temperature ranging from 20°C to 300°C, the Severe Plastic Deformation (SPD) induces a significant grain size reduction (in a range of 50 to 150 nm) but also a strong disordering of the long range ordered L10 phase. However, Transm…
Light propagation into a photonic crystal infiltrated with a nematic liquid crystal is numerically investigated. At a high-order photonic band, photonic crystals generally exhibit interesting characteristics such as a negative refraction and a superprism effect. Our numerical results show that the sign of an effective…
We have performed in-situ magnetization and high-energy X-ray diffraction measurements on two aluminum-based TRIP steels from room temperature down to 100 K in order to evaluate amount and stability of the retained austenite for different heat treatment conditions. We have found that the bainitic holding temperature a…
The characteristics and the mechanism of ferrite transformation in alloy steels which contain a carbide-forming element have attracted considerable attention for past decades. Since it is reported that the nucleation and growth of ferrite in Fe-C base alloys is accelerated by high magnetic field, the influence of a ma…
There is growing interest in the development of fabrication techniques to cost effectively mass-produced high-resolution (micro/nano) three-dimensional structures in a range of materials. Biomedical applications are particularly significant. This work demonstrates how to fabricate simultaneously a sacrificial mould ha…
The characteristics of natural yarns are inconsistent in their mechanical property. The tensile strength of jute yarns is an intricate parameter, which can not be fully described using single value. This necessitates the study of the jute yarn strength distribution and efficient experimental methods for its measuremen…