Search Results 1-20 of 4629

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Reduction in nickel content of the surface oxide layer on Ni-Ti alloy by electrolytic treatment

Yoneyama Takayuki , Hanawa Takao

… Ni-Ti alloy has been increasingly applied to dental and medical devices, however, it contains nickel, which is known to have adverse effects on the human body. … The purpose of this study was to form a nickel-free surface oxide layer on Ni-Ti alloy by electrolytic treatment for better biocompatibility.Methods: … Ni-49.15Ti (mol%) alloy was used, and the electrolytic treatment was performed in the electrolytes under 50 V for 30 minutes. …

Journal of Oral Science 63(1), 50-53, 2021

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2

Comparative study of solidification behaviors of weld pool through modelling of heat transfer and fluid flow during single- and multiplelayer deposits of 2319-aluminum alloy based on variable polarity gas tungsten arc welding

DU Jun , GENG Ruwei , WEI Zhengying , Ninshu Ma

… The resulting properties of parts fabricated by wire and arc additive manufacturing (WAAW) processes are determined by their microstructure, local composition, and porosity. …

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 112s-115s, 2020

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3

Effects of Welding Velocity and Short Time Post Weld Heat Treatment on Precipitation of Austenite in Laser Beam Welds of Duplex Stainless Steels [in Japanese]

XIA Yunxing , AMATSU Kenshiro , MIYASAKA Fumikazu , MORI Hiroaki

… Therefore, it is crucial to clarify the effect of alloy composition and welding heat cycle on microstructure change. …

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 326-333, 2020

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4

Growth mechanism of titanium oxide nanowire [in Japanese]

Kuwano Satoko , Sasaki Shinnosuke , Sugawara Mizuki , Kikuchi Shota , Sato Yoshihiro , Suzuki Hitoshi , Nomura Akiko , Omura Kazuyo , Yotoshi Noriharu

チタン-アルミ合金をアルカリ水溶液と反応させて作製したナノ構造について、本研究では電子顕微鏡（SEM、TEM）による形状観察や構造解析により、多孔質、膜、ワイヤー、管状の形状を確認した。本研究ではこれらの微細構造の成長機構を明らかにすることで、形状に関する選択性を向上させる作製条件について知見を得る事を目的とする。今回は母材の組成や反応条件の違いによる形状の違いについて報告する。 …

Abstract book of Annual Meeting of the Japan Society of Vacuum and Surface Science 2020(0), 112, 2020

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5

Composition Dependence of Normal Spectral Emissivity of Liquid Ni–Al Alloys

Adachi Masayoshi , Yamagata Yuji , Watanabe Manabu , Hamaya Sonoko , Ohtsuka Makoto , Fukuyama Hiroyuki

… To accurately model the casting process for turbine blade fabrication and design solution growth techniques for AlN, the thermophysical properties of the liquid alloy are required. … The composition dependence of the normal spectral emissivity of liquid Ni–Al alloys had a maximum at ~40–50 mol%Al-Ni. …

ISIJ International, 2020

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6

Work Softening Phenomena in Al-Fe Alloys: the Impurity-Scavenging Effect of the θ-Al13Fe4 Phase [in Japanese]

Hara Toshihiro , Egusa Daisuke , Mihara Mami , Tanaka Hiroki , Ohnuma Ikuo , Abe Eiji

… We have investigated the work softening (WS) phenomena during a cold-roll process of an Al-Fe alloy, based on hardness measurements, electron microscopy observations, and thermodynamic calculations. … The WS behavior was confirmed in the Al-Fe alloy when the rolling rate was larger than 80％, which contained fine grains with severe deformation. … In contrast, the behavior and microstructural features were hardly observed in the A1050 alloy. …

Journal of the Japan Institute of Metals and Materials 84(12), 406-412, 2020

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7

Formation of a Diffusion Barrier Coating on Ni-Based Alloy and Thermal Cycle Oxidation Property

Saito Shigeru , Hayashi Shigenari , Narita Takuro , Kato Yasumichi , Ohtsuka Motohiro , Ara Mayumi , Narita Toshio

… A diffusion-barrier coating layer (DBC) was formed on a Ni–22Cr–19Fe–9Mo alloy by Al-pack cementation at 1000°C followed by heat treatment at 1100°C. … The layer structure between the substrate and the coating layer after thermal oxidation cycling is discussed with respect to the composition paths plotted in the Ni–Cr–Fe and Ni–Cr–Al phase diagrams. …

MATERIALS TRANSACTIONS 61(12), 2336-2341, 2020

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8

Variation in Dislocation–Strengthening Factors of Cu–Zn Alloys with Solid–Solute Zinc Contents [in Japanese]

Nakagawa Koutarou , Takano Kozue , Matsunaga Hirotaka , Mori Hiroyuki , Kitahara Amane , Onuki Yusuke , Suzuki Shigeru , Sato Shigeo

… To elucidate the effect of solid–solute zinc in copper alloys on work hardening, we characterized dislocation evolution with an increase in zinc composition in copper alloys. … The increase in dislocation density with tensile deformation, accompanying work hardening, was enhanced with the zinc composition. …

Journal of Japan Institute of Copper 59(1), 59-63, 2020

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9

First–Principles Calculations of Cu Solid Solution Alloys by SQS Method [in Japanese]

Mizuno Masataka , Sugita Kazuki , Araki Hideki

… The formation energies in Cu–Ni and Cu–Zn alloys smoothly change with alloy composition, which indicates that the supercell models constructed based on the SQS method well reproduce the atomic arrangement of solid solution alloys. … In Cu–Ni alloy, an overall increasing trend was observed with increasing Ni content for the Young's and shear moduli. … In Cu–Zn alloy, the Young's and shear moduli show sudden decreases at around 14 and 32 at％ Zn. …

Journal of Japan Institute of Copper 59(1), 19-23, 2020

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10

Solid-liquid Interfacial Energy for Fe–Cr Alloy under Temperature Gradient from Molecular Dynamics Simulation

Ueno Kensho , Shibuta Yasushi

… The solid-liquid interfacial energy of Fe–Cr alloy under temperature gradient is investigated by molecular dynamics (MD) simulations in conjunction with a capillary fluctuation method including the effect of temperature gradient. … Moreover, it is confirmed that the solid-liquid interfacial energy of Fe–Cr alloy decreases with increasing Cr composition at Fe-rich composition regardless of the temperature gradient. …

ISIJ International 60(11), 2301-2305, 2020

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11

Proposal of a Compositional Characterization Method by Semi-quantitative Analysis of XRF Spectrum of Pigments in Mural Painting and Its Application to Nondestructive On-site Analysis of the Murals of the Tomb of Khonsuemheb in Egypt

ABE Yoshinari , OGIDANI Eri , HIDAKA Haruka , EBISAWA Haruka , NAKAI Izumi , TAKAHASHI Kazumitsu , KAWAI Nozomu , KONDO Jiro

… We have confirmed that bronze (Cu-Sn alloy) of similar composition was recycled as a raw material for two synthetic pigments containing Cu, Egyptian Blue and Egyptian Green. …

BUNSEKI KAGAKU 69(9), 497-504, 2020

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12

Simultaneous Measurement for Thickness and P Content of an Electroless Ni/Au Plating Film on Printed Circuit Board by XRF Spectrometry

OHGAKI Masataka , IZUMIYAMA Masaki , FUKAI Takayuki

… It is widely used for the quality control of plating, because it can measure the film thickness of multilayer plating and the composition of alloy layers with nondestructive and contactless method. … The electroless nickel is an alloy of nickel and phosphorus, and the phosphorus concentration is important for plating quality control. …

BUNSEKI KAGAKU 69(9), 515-520, 2020

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13

Uncertainty of the Analytical Values in Laser-induced Plasma Optical Emission Spectrometry for Element-based Sorting of Commercial Aluminum Alloys

FUGANE Yusuke , KASHIWAKURA Shunsuke , WAGATSUMA Kazuaki

… From the result of LIBS analysis, Al alloy samples, labeled as A1050, A1100, A2017, A2024, A5052, A5083, and A6061, were actually classified into the kinds of Al alloy for which the chemical compositions have been standardized by the Japanese Industrial Standards. … The sorting was successfully conducted, although several of them could not be classified into a particular alloy type. …

Analytical Sciences 36(11), 1415-1421, 2020

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14

Physical Properties and Composition of Cores of Terrestrial Planets [in Japanese]

TERASAKI Hidenori

To constrain the core compositions of terrestrial planets, sound velocity and density of liquid Fe-Ni-S and Fe-Ni-Si alloys were measured up to 14 GPa. Addition of S reduces the P-wave veloci …

The Review of High Pressure Science and Technology 30(2), 111-117, 2020

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15

Self-Consistent Diffraction Stress Analysis Method for Estimating Stress, Strain-Free Lattice Parameter and Composition of Solid Solutions

Harumoto Takashi , Shi Ji , Nakamura Yoshio

… Owing to the feedback of the strain-free lattice parameter, it is possible to perform the proposed method even when the exact composition is unknown. … Employing an example specimen of (111) fiber-textured palladium cobalt alloy film with different compositions, the validity of the proposed method is confirmed by comparing results with that of the conventional method. …

MATERIALS TRANSACTIONS 61(10), 1922-1929, 2020

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16

Mechanical properties and microstructures of cast dental Ti-Fe alloys

YAMAGUCHI Hirofumi , TAKAHASHI Masatoshi , SASAKI Keiichi , TAKADA Yukyo

… The aim of this study was to explore the composition of Ti-Fe alloys that offers improved wear resistance of titanium. … We believe that Ti-Fe alloys with 8–11% Fe may be applicable in development of an alloy with good wear resistance due to the exhibited properties of high hardness and ductility albeit low. …

Dental Materials Journal, 2020

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17

Investigation of Refractory Corrosion by Na2O–B2O3 Flux and Its Ability of Dissolving of Mn Oxides during a Melting Process for a Copper Alloy in the Atmosphere, Including Mn as Easily Oxidized Element

Hasegawa Itaru , Koizumi Takuya , Suzuki Masanori , Tanaka Toshihiro

… In order to clarify a guideline for designing of composition of a flux which can achieve both minimizing a refractory corrosion by the flux and maximizing of solubility of Mn oxides into the flux, corrosion tests for refractory was conducted in the air atmosphere. … The basic composition of flux is Na2O–B2O3 …

MATERIALS TRANSACTIONS 61(9), 1820-1828, 2020

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18

Evolution of TiN and Oxide Inclusions in Ti-containing Fe-25Ni-15Cr Alloy during Electroslag Remelting

Zheng Dingli , Li Jing , Shi Chengbin , Zhang Jie , Geng Ruming

… The present study was undertaken to investigate the evolution of inclusions in a Ti-containing Fe-25mass%Ni-15mass%Cr alloy during electroslag remelting (ESR). … The effect of slag composition on the inclusions in alloy was studied. … TiN inclusions in remelted ingots mainly generated in liquid metal pool during ESR, and the TiN inclusions formed during the solidification of liquid alloy takes up a small amount fraction. …

ISIJ International 60(8), 1577-1585, 2020

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19

Iron Powder-based Metal Matrix for Diamond Cutting Tools: A Review

Kumar Deepak , Dwarapudi Srinivas , Sista Kameswara Srikar , Sinha Gourav Ranjan

… For each specific application, powder for metal matrix needs careful selection based on its chemical composition, size, shape and thermal stability. …

ISIJ International 60(8), 1571-1576, 2020

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20

Development of Lead-Free High-Strength Copper Alloy

Suzaki Koichi , Goto Hiroki , Oishi Keiichiro

… C6932 is a lead-free 75.5Cu–3Si–Zn alloy (hereinafter, "C6932") which is excellent in machinability, strength, corrosion resistance, hot workability, and castability. … C6932 is widely used for water-related products and in automobile and electricity fields, and over 40,000 tons of this alloy is distributed world-wide under the brand name of ECOBRASS®.In the United States, a law to restrict lead in drinking water was put into force across the nation in 2014. …

MATERIALS TRANSACTIONS 61(8), 1684-1688, 2020

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