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MATERIALS TRANSACTIONS Vol. 65 (2024), No. 4

ISIJ International
belloff
オンライン版ISSN: 1347-5320
冊子版ISSN: 1345-9678
発行機関: The Japan Institute of Metals and Materials

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  1. Vol. 66 (2025)

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キーワードランキング

26 Dec. (Last 30 Days)

MATERIALS TRANSACTIONS Vol. 65 (2024), No. 4

Synthesis and Characterization of Graphene Nanoplatelets Fabricated by Electrochemical Exfoliation Method for Conductive Adhesive

Fakfa Payayam, Sutawee Jomrieng, Charoenkwan Kraiya, Somchai Kiatgamolchai, Duangamol Tungasmita, Sukkaneste Tungasmita

pp. 357-361

DOI:

10.2320/matertrans.MT-M2023179

抄録

Graphene nanoplatelets (GNPs) were synthesized by an electrochemical exfoliation method. Four various conditions of the electrochemical exfoliation process: (I) 1 M NaOH with 4 V, (II) 0.5 M H2SO4 with 5 V, (III) a mixture of 1 M NaOH and 0.5 M H2SO4 with 5 V, and (IV) a two-step process of 1 M NaOH with 4 V and 0.5 M H2SO4 with 5 V, were compared. The as-synthesized GNPs obtained from all conditions were characterized by Raman spectroscopy and X-ray diffraction. The two-step process provided the GNPs with the low defect concentration and the lowest number of layers. Moreover, confirmed by field emission scanning and transmission electron microscopes (FE-SEM and TEM), the GNPs obtained from the two-step process were multilayer graphene. The GNPs obtained from each condition were added into an ultraviolet-cured acrylate adhesive to fabricate electrically conductive acrylate adhesive (ECAA). The GNPs acted as fillers to play an important role in conducting the electrical network of the ECAA without any other additive. The van der Pauw method was conducted to measure the electrical resistivity of the ECAA. The ECAA, containing 5 wt% of the obtained GNPs from the two-step process, had the lowest resistivity when compared to the ECAA which contained the obtained GNPs from other conditions. We found that the percolation threshold of the ECAA, containing the obtained GNPs from the two-step process, was at 3.26 wt%. Last, 6.92 wt% of the GNPs reached the lowest resistivity at 1.09 Ω·cm.

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Short-Range Ordering Structure Found in Pd82Ge18 Amorphous Alloy Determined from Anomalous X-ray Scattering (AXS) Data by Applying Reverse Monte-Carlo (RMC) Simulation Method

T. Kawamata, R. Hayashi, K. Sugimoto, K. Sugiyama

pp. 362-367

DOI:

10.2320/matertrans.MT-M2023189

抄録

The topological and chemical short-range ordering (TSRO and CSRO) of Pd82Ge18 amorphous alloys prepared by the single-roll liquid quench method were analyzed using a combination of anomalous X-ray scattering and reverse Monte Carlo (RMC) simulation. The degree of development of TSRO and CSRO in the amorphous structure model made with the RMC simulation (RMC model) was evaluated by comparison with the dense random packing model (DRP model) calculated using metallic and covalent atomic radii. In the RMC model, a shortening of the Pd–Ge nearest neighbor correlation and a decrease in the coordination number around Ge were observed. Voronoi polyhedral analysis was performed to evaluate the local geometrical structure around the Pd and Ge atoms. Although the DRP structure can reasonably approximate the local structure around the Pd atoms, the TTP structure corresponding to the local structure in crystalline Pd2Ge develops around the Ge atoms as a characteristic TSRO. However, the preferential coordination of Pd atoms around Ge, which is a CSRO associated with the TTP structure in the crystalline phase, was not observed. These results indicate that strong CSRO does not necessarily accompany the TTP structures in metal-semimetal amorphous alloys.

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Effect of Silicon Addition on Microstructure, Hardness and Young’s Modulus of Injection Molded AZ91D Alloy

Yasutoshi Hideshima, Fumiya Maeda, Tadao Fukuta, Koichi Ozaki

pp. 368-373

DOI:

10.2320/matertrans.MT-M2023197

抄録

Magnesium chips were coated with silicon powder using a binder, and injection molding was performed using silicon-coated chips as the raw material. Microstructural analysis of the products revealed that all added silicon (Si) precipitated as Mg2Si particles, with no voids present at the interfaces between the Mg2Si particles and the matrix. Furthermore, the hardness and Young’s modulus of the products increased with higher Si content. The Young’s moduli followed the rules of mixtures.

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Effect of Graphite Addition on Microstructure, Mechanical Properties and Thermal Properties of Injection Molded AZ91D Alloy

Yasutoshi Hideshima, Fumiya Maeda, Tadao Fukuta, Koichi Ozaki

pp. 374-380

DOI:

10.2320/matertrans.MT-M2023196

抄録

Magnesium chips were coated with a high concentration of graphite using a binder and were used as the raw material for injection molding. The microstructure of the magnesium injection-molded product with added graphite exhibited a dispersion of needle-like graphite particles. No significant voids were observed at the interfaces between the graphite and the matrix. The addition of more than 0.5 mass% graphite decreased the proof stress and tensile strength of the injection-molded products. The Young’s modulus of the graphite-added products tended to decrease with an increase in the graphite content, which is consistent with the lower limit of the rule of mixtures. The thermal conductivity of the 6.9 mass% graphite-added product increased compared with that of the AZ91D magnesium alloy and the coefficient of linear thermal expansion decreased. Both values are within a range that satisfied the rules of mixtures.

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Conversion of Debris-Treated Ash into a Cesium-Adsorbent Using Alkali Reaction

Takaaki Wajima

pp. 381-388

DOI:

10.2320/matertrans.M-M2024802

抄録

A Cs-adsorbent including tobermorite was successfully synthesized from debris-treated ash via an alkali treatment. Tobermorite synthesis was examined as a function of the reaction temperature, time, solid/liquid ratio, and NaOH concentration. The formation of tobermorite was identified in the product treated with a 2–5-M NaOH solution, with a solid/liquid ratio of 50–250 g/L, at 180°C after a 24-h reaction. As the reaction temperature increased, tobermorite was rapidly synthesized owing to the rapid dissolution of Si and Al from the ash. The product, which was treated with 2.0-M NaOH solution (250 g/L) at 180°C for 24 h, indicated the high selective uptake ability for Cs+ in saline water. On increasing the solution pH, the adsorption of Cs+ increased and remained almost constant above a pH of 6. The Cs+ uptake ability of the product was extrapolated using the Langmuir and Freundlich isotherm models, was found to fit the Langmuir model better than the Freundlich model, and the calculated uptake ability was 0.36 mmol/g. The kinetics for the Cs+ uptake ability was tested for pseudo-second-order reactions, and the rate constants of the uptake were calculated. Regardless of the temperature of the aqueous solution, the kinetics of the uptake and the uptake of Cs+ were almost the same.

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Corrosion Study of Aluminum 7075 Alloy in Cationic Aqueous Medium by Surface Analysis

Md. Saiful Islam, Masatoshi Sakairi, Akira Kaneko, Md. Shakhawat Hossain

pp. 389-397

DOI:

10.2320/matertrans.MT-C2023009

抄録

The results of the corrosion nature of aluminum 7075 alloy in a cation-containing aqueous medium are reported by using gravimetric tests and surface analysis. The investigation showed a substantial increase in the mass of the specimens after the immersion experiments, while a minor mass change was seen in the Zn2+ containing solution. Energy dispersive spectroscopic mapping and cross-sectional pictures showed that the specimen submerged in the Zn2+ containing solution developed a zinc-linked layer. The results of X-ray photoelectron spectroscopy showed that aluminum hydroxide was deposited on the surface, and a tiny amount was deposited on the specimen that was sunk in the solution containing Zn2+. The present study suggests that the zinc-related layer prevents the alloy from corroding.

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Durability of Dense Alumina Coating Deposited by Hybrid Aerosol Deposition under High-Speed Steam-Jet at Elevated Temperatures

Mohammed Shahien, Kentaro Shinoda, Masato Suzuki, Hideyuki Takagi, Norihiko Iki

pp. 398-404

DOI:

10.2320/matertrans.MT-T2023003

抄録

In pursuit of achieving zero-emission power generation, the utilization of carbon-free fuels like H2 holds promise for enhancing the reliability of the next-generation turbines. To realize the necessary of new operational environment, the implementation of dense environmental barrier coatings (EBCs) becomes essential. This study delves into the investigation of the durability of dense Al2O3 coatings deposited using the Hybrid Aerosol Deposition (HAD) method under the harsh condition of a high-speed steam-jet test, operating at approximately 125 m/s and elevated temperatures. The durability assessment encompasses uncoated SUS304 substrates and SUS304 substrates with dense HAD Al2O3 coatings deposited on one side. These samples underwent a rigorous 20-hour steam-jet test within a temperature range of 600–800°C.

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The Effects of Alkaline Earth Metal Ions on the Crystal Growth of ZnO Using Layered Zinc Hydroxide Acetate as a Precursor

Yuri Honda, Haruhisa Shiomi

pp. 405-413

DOI:

10.2320/matertrans.MT-M2023208

抄録

ZnO is synthesized by aging layered zinc hydroxide acetate, ZHA, as a precursor. The effects of type and concentration of alkaline earth metal ions on the crystal growth of ZnO were studied by synthesizing ZnO by aging ZHA in calcium acetate (CaAc), strontium acetate (SrAc), and barium acetate (BaAc) aqueous solutions at various concentrations. In all cases, ZnO particles elongated in the c-axis direction were obtained, and the aspect ratio increased with increasing ion concentration. Especially, in BaAc solution, the longest particles in the c-axis direction were observed. This is due to the small hydration ionic radius of barium, which is easily adsorbed on the side of ZnO. When aging ZHA in 2.0 mol/L of BaAc solution, agglomerated particles were formed in the early stage of aging, and the growth of individual particles in the agglomerate and entire agglomerated particles proceeded in parallel, resulting in particles with characteristic bouquet-shapes. In conclusion, the c-axis growth of ZnO is controlled by the type and concentration of alkaline earth metal ions.

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Combustion Foaming of Porous (Al, Fe)3Ti with L12 Ordered Structure

Asuka Suzuki, Terumasa Fujishiro, Naoki Takata, Makoto Kobashi

pp. 414-421

DOI:

10.2320/matertrans.MT-M2023213

抄録

The combustion foaming process enables the fabrication of closed-cell porous intermetallics by utilizing the combustion reactions generating a large amount of heat. A closed-cell porous Al3Ti (D022 crystal structure) fabricated by the combustion foaming process has a lightweight, high stiffness, high melting temperature, and good oxidation resistance but exhibits brittleness due to the poor deformability of Al3Ti. It is known that the addition of third elements (X = Cr, Mn, Fe, etc.) changes the crystal structures from D022 to L12, resulting in an improvement in the deformability in the case of dense materials. In the present study, an attempt was made to fabricate the closed-cell porous (Al, Fe)3Ti with an L12-ordered crystal structure through the combustion foaming. The effect of the amount of the exothermic agent, which was added to control the reaction heat of combustion foaming, on the porosity, pore morphology, microstructure, and constituent phases was investigated. The closed-cell porous L12-(Al, Fe)3Ti without any intermediate phases was successfully fabricated when the exothermic agent was added over 5 vol%. The porosity reached the maximum at approximately 80% when the exothermic agent of 10 vol% was added. The TiB2 particles, which were formed by the reactions of the exothermic agent, were aggregated in the porous sample with the exothermic agent of 5 vol% but uniformly dispersed in the porous samples foamed with the exothermic agent over 10 vol%. Based on the results above and the temperature measurements during the combustion foaming, it is important for fabricating highly porous L12-(Al, Fe)3Ti with the uniform microstructure to control the maximum temperature just above the liquidus temperature of (Al, Fe)3Ti. This study provides new insights into the hierarchical control of porous materials with the desired pore structures and cell wall materials.

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Suppression of Shrinkage Cavity Formation in Silicon Steel by Partial Non-Magnetization

Norihiko Hamada, Takashi Horikawa, Katsunari Oikawa, Satoshi Sugimoto

pp. 422-427

DOI:

10.2320/matertrans.MT-MBW2023001

抄録

Internal permanent magnet motors suffer from leakage flux in their rotor core bridges, which can be removed through the partial non-magnetization of the bridges. In a previous study, a process was proposed in which the bridged portion of the silicon steel sheet was non-magnetized after pressing by melting, an Ni–Cr alloy powder was added to the silicon steel sheet using a laser, and the rotor core was produced via lamination. However, because the final solidification step produced solidification defects, such as cracks and shrinkage cavities, a homogenous alternative step that does not produce solidification defects needs to be developed. To reduce the area of improvement, we previously investigated a chemical composition that suppressed solidification defect formation. The addition of B to the improved portion suppressed the formation of cracks and shrinkage cavities, and a crack-suppression mechanism was proposed. In this study, we focus on the mechanism of shrinkage cavity suppression. We determine that the solidification shrinkage rate decreases owing to the precipitation of Cr2B, which has a lower density than the austenite phase, and results in the suppression of the shrinkage cavities. Minimization of the area of non-magnetic improvement is possible by suppressing solidification defects. Consequently, the laser processing speed per piece and amount of expensive nickel are reduced. These new alloys show promise for practical partial non-magnetizing applications.

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Estimating the S-N Curve by Machine Learning Random Forest Method

Nobuo Nagashima, Masao Hayakawa, Hiroyuki Masuda, Kotobu Nagai

pp. 428-433

DOI:

10.2320/matertrans.MT-Z2023006

抄録

Fatigue limit is well predicted by tensile strength or hardness, and the relationship is often analyzed by linear regression using the minimum squared approximation. However, the prediction of the number of cycles to failure at a given stress amplitude, meaning the estimate of the S–N curve, has not been realized. Therefore, we aim to investigate the estimability of the S–N curve using the random forest method based on the data described in the NIMS fatigue data sheet. The random forest method is a machine learning algorithm and an ensemble learning algorithm that integrates weak learners of multiple decision tree models to improve generalization ability. It was clarified that the machine learning of the multiple decision tree model is excellent in fatigue limit prediction. The S–N curve can be accurately estimated by combining the prediction of fatigue limit and the number of cycles to failure at a given stress amplitude.

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Enhancing the Properties of Oxygen-Free Copper for High-Current Applications through Trace Element Additions

Tomomi Iihara, Yuki Ito, Kosei Fukuoka, Kenichiro Suehiro, Kazunari Maki

pp. 434-439

DOI:

10.2320/matertrans.MT-D2023013

抄録

Oxygen-free copper is an integral part of electric vehicles and renewable energy initiatives as the key conductor material owing to its high conductive properties. However, the poor heat resistance and poor stress relaxation resistance characteristics pose challenges for applications involving heat. This study aims to explore the potential for developing a new pure copper material with enhanced heat resistance and stress relaxation resistance characteristics while maintaining conductivity. Trace amounts of solute elements Mg, Sn, P, Ti, and Ag were added to oxygen-free copper, and the following results were obtained from the cold-rolled material:

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Improvement of the Sintering and Mechanical Properties of SiC Utilizing the Increased Milling Efficiency of Si Source Recycled from Si Sludge

Hanjung Kwon, Jaemin Song, Doyeon Lee, Jonghyuck Jeon, Jin-Young Lee

pp. 440-446

DOI:

10.2320/matertrans.MT-M2023170

抄録

This study enhanced the efficiency in the milling process of preparing SiC powder using the source recycled from Si sludge as a raw material. The sludge, which is formed during machining Si wafer, intrinsically contains SiC (abrasive material), thus due to the high hardness of SiC, the milling effect on the Si sources with sludge was expected to be higher than that of the pure Si. Indeed, the SiC included intrinsically in the sludge resulted in more effective milling of the sludge–carbon mixture; and after high-energy ball milling, the crystallite size of Si in the mixture decreased to 26.8 nm, while the crystallite size of Si in the source without sludge was 49.5 nm. The increase of milling effect in the sludge contributed to the low reaction temperature, improved the sinterability, and reduced the grain size of the sintered SiC. Finally, using the sludge as a raw material, SiC of high density, refined microstructure, and enhanced hardness (Hv: 29.5 GPa, previously reported Hv: (23.7–26) GPa) was obtained. These results suggest that the use of sludge can be an effective way to produce SiC with refined microstructure and enhanced properties, as well as to reduce the cost of production of SiC parts.

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Estimation of the Increase Potential of Global Soil CO2 Efflux by Surface Air and Soil Warming Based on the Mathematical Model Formula for Diurnal and Seasonal Variations in Soil Temperature

Salmawati, Yuichi Sugai, Kyuro Sasaki

pp. 447-453

DOI:

10.2320/matertrans.M-M2024801

抄録

Increasing global temperatures due to high atmospheric carbon dioxide (CO2) concentrations may cause an imbalance in the carbon circulation on earth. It has been reported that CO2 emissions from natural soils in all terrestrial areas on Earth account for about 25% of atmospheric CO2 emissions in the global carbon cycle. A tendency is well known that the higher the soil temperature with the higher the metabolic activity of microorganisms in the soil. Furthermore, since the global soil CO2 emissions are huge amount that approximately seven times the total atmospheric CO2 emissions from human origin, it is necessary to investigate the increasing rate of soil CO2 emission rate per unit area and unit time on a global scale (global soil CO2 efflux) that is affected by soil temperature rise due to global warming expected in the coming decades.

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