著者

森 久史 伊藤 暁 辻村 太郎

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.70, no.8, pp.638-641, 2006 (Released:2006-08-22)

参考文献数

8

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This paper presented the results of application of super hydrophilicity TiO2 coating on Shinkansen vehicle. Also effect of metalic powder on hydrophilicity of TiO2 coatings was investigated. It was found that durability of protection from dirt adhesion was less than five months in real vehicle tests. The reason of degradation on protection was due to the contamination of metal powders produced by abrasive wear on the coating surface. Accordingly, it was considered that the degradation of hydrophilicity was attributed to the metal powder on the interface between TiO2 and water.

著者

小山 真司 川澄 健太郎

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.74, no.10, pp.656-661, 2010 (Released:2010-10-01)

参考文献数

9

被引用文献数

1 3

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The purpose of this study is the development of simultaneous processing of diffusion bonding and surface nitriding. Carbon steel was used as the base material. The surface was nitrided to a 20-μm-thick titanium foil. The sample was arranged in the order of carbon steel, titanium foil, and Al2O3 powder (diameter=1 μm) and placed in N2 gas in a furnace to undergo simultaneous diffusion bonding and surface nitriding. These processes were carried out at a processing temperature T of 1100~1250 K and processing pressure P of 0.5 MPa (processing time=4.8 ks). Because no defect was observed in the bonded interface, it was confirmed that a sufficiently suitable joint can be obtained under these processing conditions. The surface hardness was observed to increase with the increase in processing temperature; it reached approximately HV1600 at 1250 K. The surface of the titanium foil, which had been simultaneously processed at 1250 K, consisted of a single phase of TiN. The results of the ball-on-disc-type wear test revealed that the surface, which had been processed at 1250 K, was hardly worn by the TiN layer.

著者

Abe Hiroya Sato Kazuyoshi Nishikawa Hiroshi Takemoto Tadashi Fukuhara Mikio Inoue Akihisa

出版者

公益社団法人 日本金属学会

雑誌

MATERIALS TRANSACTIONS

巻号頁・発行日

vol.50, no.6, pp.1255-1258, 2009

被引用文献数

34

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The dealloying behavior of Cu<SUB>60</SUB>Zr<SUB>30</SUB>Ti<SUB>10</SUB> metallic glass was investigated under free corrosion conditions using hydrofluoric acid (HF) solutions at room temperature. After immersing in HF solutions with various concentrations (0.05, 0.1, 0.5 and 1 M) for 300 s, color of all samples changed to be pinkish or peachy, which was ascribed to Cu based on the XRD patterns. According to the SEM-EDS study, HF immersion selectively leached the Zr and Ti elements, leaving Cu behind. Increasing the HF concentration increased the dealloying rate. Moreover, the HF concentration strongly influenced the surface morphology of the resulting Cu.

著者

出川 通

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.43, no.6, pp.535-539, 2004-06-20 (Released:2011-08-11)

参考文献数

6

著者

南雲 道彦

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.50, no.5, pp.205-211, 2011 (Released:2012-12-06)

参考文献数

41

被引用文献数

4

著者

徳永 英明 中村 明 真嶋 宏

出版者

公益社団法人 日本金属学会

雑誌

まてりあ

巻号頁・発行日

vol.34, no.1, pp.3-8, 1995

被引用文献数

2

著者

綿谷 知久 吉川 雅明 田中 俊 小島 広光

出版者

公益社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:00214876)

巻号頁・発行日

vol.67, no.11, pp.643-646, 2003-11-20

参考文献数

7

被引用文献数

2 1

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In order to improve the wettability and storage stability of Sn-Zn system Pb-free cream solders, minute amounts of Mg, Al, Cu, Pb, and Sb were added to the Sn-8Zn-1Bi Pb-free alloy, and its properties were evaluated.<BR>The results obtained are:<BR>&mdash;Mg and Al additions were effective in improving wettability,<BR>&mdash;the addition of Al increased the amount of unmelted solder, and<BR>&mdash;the addition of Mg caused degradation of storage stability due to an increase in solder viscosity.<BR>Addition of the other elements did not improve the wettability. The combination of Mg and Al additions was found to improve wettability and storage stability, leading to stable wettability. Results of AES surface analyses showed that the solder with Mg and Al additives forms an Mg-Al-composite oxide film in the surface layer, which suppresses Zn oxidation observed in non-added solders. The suppression of Zn oxidation and the formation of a thin Mg-Al-composite film contribute to the wettability and storage stability improvements.

著者

古原 忠 安中 聡 牧 正志

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.72, no.12, pp.942-948, 2008 (Released:2008-12-01)

参考文献数

15

被引用文献数

2 2

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Effects of carbon addition on microstructure of Ti-V alloys formed at high temperatures were investigated.    By adding carbon to pure Ti and Ti-V binary alloys, precipitation of TiC occurs. With increase of vanadium content, β/(β+TiC) phase boundary shifts to the lower carbon side slightly. On the other hand (α+β)/(α+β+TiC) boundaries shifts largely with decreases in α fraction and peritectoid reaction temperature by addition of vanadium.    Addition of carbon to a Ti-15V-3Cr-3Sn-3Al alloy results in extensive suppression of recovery during hot deformation of β phase by carbon in solution. Also age hardening kinetics of Ti-15V-3Cr-3Sn-3Al after β solutionizing was accelerated by carbon addition.

著者

国谷 啓一 荒川 英夫 金井 恒行 千葉 秋雄

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.49, no.10, pp.906-912, 1985 (Released:2008-04-04)

参考文献数

10

被引用文献数

3 4

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We have developed a new material of copper-carbon fiber composite which possesses the properties of copper, i.e., the excellent electrical and thermal conductivities, and the property of carbon fiber, i.e., a small thermal expansion coefficient. These properties of the composite are adjustable within a certain range by changing the volume and/or arrangement of carbon fibers.The effects of volume and arrangement of fiber on the thermal conductivity, electrical conductivity and specific heat of the composite were studied. Results obtained are as follows:(1) The thermal and electrical conductivities of the composite became smaller as the volume of carbon fiber increased, and were influenced by the fiber arrangement.(2) The above results were predictable from a careful application of the “rule of mixtures” for composites.(3) The specific heat of the composite was dependent not on the fiber arrangement but on the fiber volume.(4) In the thermal fatigue tests, no degradation in the electrical conductivity of this composite was observed.

著者

中川 鉄水

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.57, no.4, pp.181, 2018

著者

小野寺 礼尚

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.54, no.8, pp.413-413, 2015 (Released:2015-08-01)

著者

村田 純教

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.80, no.11, pp.669-683, 2016 (Released:2016-10-25)

参考文献数

57

被引用文献数

3

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Lath Martensite is formed in low carbon steels and plays an important role in the mechanical properties of heat resistant steels containing about 0.1 mass%C. The lath martensite shows the hierarchic microstructure being composed of packet, block and lath. Martensitic transformation is the phase transformation accompanying orderly shear deformation without atomic diffusion. Relaxation of the strain energy caused by the deformation is the origin of the hierarchic microstructure but the formation mechanism of this microstructure has heretofore not been understood. In this paper, we survey first both the experimental results and phenomenological formation mechanism of the lath martensite reported so far and introduce a new mechanism (Two Types of Slip Deformation model: TTSD model), which is constructed by considering, independently, two kinds of slip deformations using the slip deformation model proposed by Khachaturyan. It is also introduced that TTSD model enables us to simulate the martensite phase formation by the phase-field method. Furthermore, it is found that TTSD model allow us to predict the features of lath martensite, such as the existence of sub-blocks and high dislocation density in lath. In particular, for the first time, the reason why laths in a block structure exist, can be clearly explained by TTSD model.

著者

牧 正志

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.54, no.11, pp.557-563, 2015 (Released:2015-11-01)

参考文献数

13

被引用文献数

1 11

著者

塩原 融 中岡 晃一 和泉 輝郎 加藤 丈晴

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.80, no.7, pp.406-419, 2016 (Released:2016-06-25)

参考文献数

145

被引用文献数

7

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Since the discovery of the YBCO superconductor, many efforts have been made to develop useful superconductive wire and tape for many electrical power applications. Especially, the second generation coated conductors using REBaCuO (RE: rare earth element, Y, Gd, Sm, Nd, Eu etc) compounds have high expectations because of its high critical current density at the liquid nitrogen temperature and under self fields as well as high magnetic fields. Recently, several processes have been successfully developed to introduce effective magnetic flux pinning centers into the REBCO layer in order to enhance the in-field critical current densities. This paper reviews the present status of the research and development about the improvement of critical currents in considerations of nano-scale microstructure.

著者

野田 忠吉

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.42, no.2, pp.111-114, 2003-02-20 (Released:2011-08-11)

著者

金 熙榮

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:18845843)

巻号頁・発行日

vol.53, no.1, pp.11-17, 2014 (Released:2014-01-01)

被引用文献数

5

著者

譚 毅 篠田 哲守 三島 良直 鈴木 朝夫

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.57, no.3, pp.356-361, 1993 (Released:2008-04-04)

参考文献数

21

被引用文献数

1 2

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With boron-doped NiAl alloys, the solubility of boron, the composition and structure of the precipitated boride and the change in fracture mode due to boron addition have been studied. The solubility of boron is very small on the Ni-rich side of the alloys with a slight increase in its magnitude with deviation from the stoichiometric composition of the alloys, while the solubility of boron on the Al-rich side can be neglected. The structure of the precipitated boride on the Ni-rich side of the NiAl(45 at%Al) alloy is a Cr23C6 type compound, where composition is Ni60Al10B30 and the lattice parameter of which is 1.0542 nm.The fracture mode for the alloys changes from the intergranular to the transgranular type of fracture as an increase in boron concentration for both sides of Ni- and Al-rich compositions. However, the critical concentration of boron to the mode change in fracture mode is 0.003 mass% on the Ni-rich side, whereas it is 0.02 mass% on the Al-rich side.

著者

太刀川 英男 中西 和之 森 広行

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.40, no.4, pp.356-359, 2001-04-20 (Released:2011-08-11)

参考文献数

12

被引用文献数

1 1

著者

松本 仁

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.66, no.12, pp.1350-1355, 2002 (Released:2008-04-24)

参考文献数

27

被引用文献数

1 7

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The transformation behavior of near equiatomic NiTi alloys were precisely measured by a four-probe potentiometric method in order to investigate the effects of the repetition of the transformation with thermal cycling. Complete and incomplete thermal cycles induce an anomalous increase in electrical resistivity which is attributed to formation of the R-phase. The incomplete thermal cycle is effective in the formation of the R-phase in comparison with the complete thermal cycle. The behavior of the transformation to the R-phase with thermal cycles depends on the composition and it is more difficult to induce and stabilize the R-phase by thermal cycling in NiTi with higher Ms. The characteristics on the effects of the thermal cycles are the shift of the Ms to the low-temperature side and the stabilization of the R-phase, which are taken to be attributable to the accumulation of transformation-induced defects. The precise measurement of the electrical resistivity proved helpful in order to detect the trace of the R-phase and characterize the effects of the thermal cycles.

著者

千野 靖正 黄新 胜 鈴木 一孝

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.81, no.2, pp.49-54, 2017-02-01 (Released:2017-01-25)

参考文献数

41

被引用文献数

16

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Magnesium (Mg) alloys are suitable materials for weight reduction in vehicles because of their low densities and high specific strengths. However, rolled Mg alloy sheets generally exhibit a poor formability at room temperature and thus their applications are restricted. This poor formability is originated from basal slip dominated deformation as well as strong basal texture. It is known that the formability can be improved by suppression of basal texture formation. Thus, large efforts have been devoted to texture control for the purpose of enhancing the room temperature formability. In this paper, recent researches for texture control of rolled Mg alloy sheets are reviewed.0