Materials Science Forum

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EISSN : 1662-9752
Published by: Trans Tech Publications, Ltd. (10.4028)
Total articles ≅ 59,960
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Kun Qi Lv, Wen Hao Cai, Zhuang Li, Zhi Sheng Nong, Li Zhang
Materials Science Forum, Volume 1064, pp 177-182;

A novel type of titanium alloy was investigated in this article. The microstructure and mechanical properties of Ti-3573 and Ti-3873 titanium alloys were observed and measured after 20% hot deformation, respectively. The results shown that both titanium alloys occurred dynamic recrystallization (DR) during hot deformation. The tensile strength of Ti-3873 titanium alloy was better than that of Ti-3573 titanium alloy. Both titanium alloys have fine secondary α-phase which appeared granular or acicular near the β-grain boundaries or within the β-grain after hot deformation. Better tensile strength (847 MPa) of Ti-3873 titanium alloy is contributed to the higher content of β-phase stable element (Mo). The improvement plasticity (12 %) of Ti-3573 titanium alloy is due to the occurrence of dynamic recrystallization during hot deformation.
Dominick Wong, Mahmood Anwar, Sujan Debnath, Abdul Hamid, Sudin Izman, A.K. Basak, Alokesh Pramani
Materials Science Forum, Volume 1064, pp 27-37;

Numerous literatures have suggested that the use of natural fiber as filler can improve the mechanical properties of a polymer composite. Oil palm empty fruit bunch fibers (OPEFB) are no exception and have shown to exhibit good mechanical properties, with the potential to produce environmentally friendlier composites. In this study, the tensile strengths and morphologies of micro OPEFB filled composites with varying loadings (0.3125 wt% to 10 wt%) were investigated. It was found that increasing content of OPEFB reduces the translucency of the composite almost linearly. It was also revealed that the addition of 0.3125 wt% to 2.5 wt% has a reinforcing effect, observing improvement up to 17.4% compared to its neat condition. Such findings would facilitate the development of an effective OPEFB reinforced polymeric nanocomposite.
Materials Science Forum, Volume 1064, pp 151-156;

Designers are still seeking novel, smart and advanced materials. Moreover, a designed geometry for special purposes is also required for structures. In this regard, metamaterials are artificial structures with optimized topology. Furthermore, the multi-material metamaterial (4M) structure could be a frontier technology in different industries, especially in biomechanics, which provides various functions. In this short perspective, 4M structures have been introduced by emphasizing the application of bones and implants. Under cyclic loading, such a smart material should be topology-optimized with the objective of fatigue properties, the fretting fatigue lifetime, reliability, and weight. In addition, the constraint in this finite element modeling-based multi-objective optimization is the strength or the deformation of the structure.
, , Anatoly P. Surzhikov, Anatoliy I. Kupchishin
Materials Science Forum, Volume 1064, pp 99-108;

The magnetic spinel phase formation in Ni1-xZnxFe2O4 (x=0.1, 0.3, 0.5) nickel-zinc ferrite synthesized from mechanically activated NiO-ZnO-Fe2O3 mixture was studied by thermomagnetometry method, X-ray diffraction and saturation magnetization analyses. The initial reagents were activated via milling the mixture in a planetary ball mill at 500 and 1000 rpm. The Ni-Zn ferrites were synthesized at 950 °C for 4 hours using the solid-state technology. The correlation between the results obtained using above methods of testing ferrite was revealed. It was found that the magnetic spinel phase concentration in the synthesized samples increases with an increase in the milling energy intensity of mixture. Thus, ferrite obtained from pre-activated at 1000 rpm oxides is characterized by a high concentration of nickel-zinc ferrite in their composition.
Zhi Yong Tan, Jie Bing Wang, Fan Fu Meng, Cong Xu
Materials Science Forum, Volume 1064, pp 9-14;

The technologic characteristics of typical C/SiC rivet connecting unit by chemical vapor infiltration(CVI) is discussed. It is pointed out that many mechanical limitations caused by connection are the important reasons for the huge gap between the development of C/SiC composite material and the actual thermal structure application. The current situation of preparation and mechanical properties of typical rivet joints on C/SiC composites is summarized. The rational dimension of rivet is given through the test of typical rivet units. Finally, the idea of follow-up research on C/SiC connection by combining analysis with experimental verification is put forward.
Hans Aoyang Zhou, Florian Brillowski, Christoph Greb, Daniel Lütticke
Materials Science Forum, Volume 1064, pp 79-85;

Fiber reinforced plastics are an essential material for lightweight products. However, their superior mechanical properties compared to traditional materials are only guaranteed, if necessary quality requirements are met (e.g. fiber orientation). One promising approach for detecting quality deviations in image-based monitoring data is to use deep learning models. Nevertheless, these models need vast amounts of labeled training data, which is either not available or expensive to attain. To train deep learning models more data efficiently, a common and intuitive transfer learning approach is applied to detect fiber orientations for two different fiber reinforced plastics. By comparing the similarity between different domains of public datasets with the domain of the materials of this work, the range of optimal hyperparameters were estimated for the transfer learning task at hand. Through a grid search within the estimated hyperparameter range, the best-performing models were identified, showing that models transferred from similar domains do not only result in better performance but are also more robust against data scarcity. Finally, the results show that transfer learning holds the potential to accelerate the usage of deep learning for quality assurance tasks in textile-based manufacturing.
Yao Tsung Lin, Chiu Lan Yang, Shyh Shin Hwang, Shu Mei Chen
Materials Science Forum, Volume 1064, pp 21-26;

Chitosan is a biodegradable material with good biocompatibility. It can be used in medicine, foodstuff, the chemical industry and heavy metal adsorption. In this study, an exothermic foaming agent (Azodicarbonamide) injection molded was added to polypropylene (PP), maleic anhydride (MA) grafted PP (PPgMA) and Chitosan composites. MA served as a compatibilizer due to the poor bonding between PP and chitosan. This study investigated the effects of the modifier and chitosan loading on the tensile strength, thermal properties and morphology in chemical foam injection-molded PP and PPgMA composites. The results showed that the tensile strength decreased with the addition of chitosan, but Young’s modulus increased with the added chitosan loading. The enhancement was significant for foam injection molding. The cell size decreased and the cell density increased with the addition of chitosan for the PP/PPgMA composites. The thermogravimetric analysis (TGA) results showed that the thermal degradation could be decreased with the addition of chitosan in both the PP and PPgMA composites. The use of foamed chitosan composites will be further investigated in the removal of heavy metal in waste water.
, Dmitry Il'Yashchenko, Elena V. Lavrova, Elena Verkhoturova, Nikolay Pavlov
Materials Science Forum, Volume 1064, pp 189-199;

The paper presents a state-of-the-art review of additive manufacturing and summarizes its development trends. It considers mainstreams of this technology and outlines its methods. The study highlights importance and prospects of the process based on electrode wire arc welding (GMAW and GTAW). It proposes a layered electric arc deposition by a consumable electrode in shielding gases. A peculiarity of this procedure is that a wire is preheated to a temperature of 400-600°С before fed into a zone where metal products are formed. Wire preheating is realized by an additional power supply placed at a distance of 250-400 mm from a wire end to conduct a preheating current. It is suggested this process is suitable for manufacturing metal products in principle. The study has revealed a gradient structure of product walls manufactured using this technology. It is an upper deposited layer only that has a dendrite structure. Layers below it are subject to repeated thermal treatment caused by heat liberation from the upper layer. As a result, a grain tends to the refinement up to 10 μm depth wise. The most important outcome to emerge from the study is that a 4 mm thick frame structure free of defects may be built given that deposition is carried out by a material with a diameter of 1.2 mm in the conditions: current force 120-140А, voltage 22-24 V, deposition rate 300 mm/min.
, Vitaly A. Vlasov, Anatoly P. Surzhikov, Anatoliy I. Kupchishin
Materials Science Forum, Volume 1064, pp 129-138;

The formation of LiFeO2 lithium ferrite from unmilled and milled Fe2O3-Li2CO3 mixture was studied by X-ray powder diffraction (XRD). The ball milling was perform via AGO-2S high-energy planetary ball mill at a rotational speed of 2220 rpm for 60 min. Solid-phase synthesis was carried out by conventional laboratory furnace at 600 °C. Using PowderCell 2.4 software, the structural parameters of the reagents and ferrite obtained from these were determined. According to the XRD data, the crystallite sizes of the milled reagents decreased, while the strains increased. It was found that the synthesized ferrite is characterized by multiphase composition consisting of unreacted initial reagents, α-LiFeO2, γ-LiFeO2 and α-Li0.5Fe2.5O4 phases, the concentration of which depends on the prehistory of the mixture.
Zhi Hui Wang
Materials Science Forum, Volume 1064, pp 165-174;

Characteristics of the symmetric coplanar strip line on multi-layer dielectric substrates expressed in analytic formulas have been obtained using conformal mapping. But in most previous presented papers, the metal strip is considered as infinitely thin or PEC while the influence of dielectric substrates are not considered. In this paper, the propagation characteristics of symmetric coplanar strip line with finite conductivity and finite metal strip thickness on multilayer substrates are analyzed by conformal mapping at THz regions. The influences of metal strips and dielectric substrates on the propagation characteristics of CPS are also given. The numerical results are very useful for the development of terahertz devices and terahertz material.
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